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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/architecture/" rel="canonical"><link href=../design_goals/ rel=prev><link href=../customers/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Architecture - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-seaLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/architecture/" rel="canonical"><link href=../design_goals/ rel=prev><link href=../customers/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Architecture - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Architecture </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-seaLine truncated
|
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input[/"input<br>(string, stream,<br>iterator range, file)"/]
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ia["input adapter"]
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lexer["lexer"]
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@@ -65,7 +65,7 @@
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16-31: "extra"
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32-63: "off"
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64-95: "len"
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96-127: "next"</code></pre> <table> <thead> <tr> <th>Bytes</th> <th>Field</th> <th>Type</th> <th>Contents</th> </tr> </thead> <tbody> <tr> <td>0</td> <td><code>kind</code></td> <td><code>uint8_t</code></td> <td>the type, numbered as <a href=../../api/basic_json/value_t/ ><code>value_t</code></a>: 0 null, 1 object, 2 array, 3 string, 4 boolean, 5 signed integer, 6 unsigned integer, 7 float; 10 for a link (see below). There is no node for a discarded value: a <a href=../../api/basic_json_view/is_discarded/ >discarded</a> view has none</td> </tr> <tr> <td>1</td> <td><code>flags</code></td> <td><code>uint8_t</code></td> <td>bits 0-1: where a string's bytes (or a number's token) are (0: the source text, 1: the buffer of decoded strings, for strings with escapes, 2: the edit buffer); bit 2: the value of a boolean; bit 3: moved, bit 4: new, bit 5: linked (see below)</td> </tr> <tr> <td>2-3</td> <td><code>extra</code></td> <td><code>uint16_t</code></td> <td>numbers: the number of integer digits (low byte) and fraction digits (high byte), 255 for more; objects: the number of their key hash index (1-based), or 0; otherwise 0</td> </tr> <tr> <td>4-7</td> <td><code>off</code></td> <td><code>uint32_t</code></td> <td>where the value starts: the first byte after a string's opening quote (or its position in the buffer of decoded strings), the first byte of a number or literal, the bracket of an array or object</td> </tr> <tr> <td>8-11</td> <td><code>len</code></td> <td><code>uint32_t</code></td> <td>strings: the length after decoding; floats and literals: the length of the token; arrays and objects: the number of elements</td> </tr> <tr> <td>12-15</td> <td><code>next</code></td> <td><code>uint32_t</code></td> <td>arrays and objects: the number of nodes of the subtree, including the node itself</td> </tr> </tbody> </table> <ul> <li><strong>Integers</strong> keep their converted value in bytes 8-15 instead of <code>len</code> and <code>next</code>; the length of their token follows from the number of digits in <code>extra</code> (and the sign). Non-negative integers are unsigned integers, as with <a href=../../api/basic_json/parse/ ><code>parse</code></a>.</li> <li><strong>Floats</strong> keep only their token. The digit layout in <code>extra</code> lets the conversion read the digits without scanning the token again, and only when the value is read.</li> <li><strong>Object members</strong> are the node of the key (a string) followed by the nodes of the value.</li> <li><strong>Navigation</strong> needs no pointers: the elements of an array or object follow its node, and the node after a value's subtree is <code>next</code> nodes further for an array or object, and the next node otherwise (<code>document_data::after</code>). Views step from element to element this way and skip whole subtrees in constant time.</li> <li><strong>Offsets</strong> are 32 bits wide, so a document is limited to 4294967279 bytes, 4 GiB minus 16 bytes (a margin below 2^32 for positions one scanner step past the end of the text; <code>out_of_range.416</code>).</li> <li><strong>Large objects</strong> (128 members or more) get a hash index for their keys after parsing (<a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/object_index.hpp"><code>detail/view/object_index.hpp</code></a>): an open-addressing table whose slots hold the distance from the object's node to a key's node, so that a lookup does not compare every key. Of duplicate keys the table leads to the first, as a linear search does. The object's <code>extra</code> holds the number of its table. Only 65,535 tables fit into <code>extra</code>; objects beyond them are searched linearly.</li> </ul> <p>For example, <code class=highlight><span class=p>{</span><span class=nt>"a"</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mf>2.5</span><span class=p>]}</span></code> becomes five nodes. Each node's elements follow it, and <code>next</code> leads from an array or object past its subtree:</p> <pre class=mermaid><code>flowchart LR
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96-127: "next"</code></pre> <table> <thead> <tr> <th>Bytes</th> <th>Field</th> <th>Type</th> <th>Contents</th> </tr> </thead> <tbody> <tr> <td>0</td> <td><code>kind</code></td> <td><code>uint8_t</code></td> <td>the type, numbered as <a href=../../api/basic_json/value_t/ ><code>value_t</code></a>: 0 null, 1 object, 2 array, 3 string, 4 boolean, 5 signed integer, 6 unsigned integer, 7 float; 10 for a link (see below). There is no node for a discarded value: a <a href=../../api/basic_json_view/is_discarded/ >discarded</a> view has none</td> </tr> <tr> <td>1</td> <td><code>flags</code></td> <td><code>uint8_t</code></td> <td>bits 0-1: where a string's bytes (or a number's token) are (0: the source text, 1: the buffer of decoded strings, for strings with escapes, 2: the edit buffer); bit 2: the value of a boolean; bit 3: moved, bit 4: new, bit 5: linked (see below)</td> </tr> <tr> <td>2-3</td> <td><code>extra</code></td> <td><code>uint16_t</code></td> <td>numbers: the number of integer digits (low byte) and fraction digits (high byte), 255 for more; objects: the number of their key hash index (1-based), or 0; otherwise 0</td> </tr> <tr> <td>4-7</td> <td><code>off</code></td> <td><code>uint32_t</code></td> <td>where the value starts: the first byte after a string's opening quote (or its position in the buffer of decoded strings), the first byte of a number or literal, the bracket of an array or object</td> </tr> <tr> <td>8-11</td> <td><code>len</code></td> <td><code>uint32_t</code></td> <td>strings: the length after decoding; floats and literals: the length of the token; arrays and objects: the number of elements</td> </tr> <tr> <td>12-15</td> <td><code>next</code></td> <td><code>uint32_t</code></td> <td>arrays and objects: the number of nodes of the subtree, including the node itself</td> </tr> </tbody> </table> <ul> <li><strong>Integers</strong> keep their converted value in bytes 8-15 instead of <code>len</code> and <code>next</code>; the length of their token follows from the number of digits in <code>extra</code> (and the sign). Non-negative integers are unsigned integers, as with <a href=../../api/basic_json/parse/ ><code>parse</code></a>.</li> <li><strong>Floats</strong> keep only their token. The digit layout in <code>extra</code> lets the conversion read the digits without scanning the token again, and only when the value is read.</li> <li><strong>Object members</strong> are the node of the key (a string) followed by the nodes of the value.</li> <li><strong>Navigation</strong> needs no pointers: the elements of an array or object follow its node, and the node after a value's subtree is <code>next</code> nodes further for an array or object, and the next node otherwise (<code>document_data::after</code>). Views step from element to element this way and skip whole subtrees in constant time.</li> <li><strong>Offsets</strong> are 32 bits wide, so a document is limited to 4294967279 bytes, 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> minus 16 bytes (a margin below 2^32 for positions one scanner step past the end of the text; <code>out_of_range.416</code>).</li> <li><strong>Large objects</strong> (128 members or more) get a hash index for their keys after parsing (<a href="https://github.com/nlohmann/json/blob/develop/include/nlohmann/detail/view/object_index.hpp"><code>detail/view/object_index.hpp</code></a>): an open-addressing table whose slots hold the distance from the object's node to a key's node, so that a lookup does not compare every key. Of duplicate keys the table leads to the first, as a linear search does. The object's <code>extra</code> holds the number of its table. Only 65,535 tables fit into <code>extra</code>; objects beyond them are searched linearly.</li> </ul> <p>For example, <code class=highlight><span class=p>{</span><span class=nt>"a"</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mf>2.5</span><span class=p>]}</span></code> becomes five nodes. Each node's elements follow it, and <code>next</code> leads from an array or object past its subtree:</p> <pre class=mermaid><code>flowchart LR
|
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n0["0: object<br>len 1, next 5"]
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n1["1: key a"]
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n2["2: array<br>len 2, next 3"]
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@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/customers/" rel="canonical"><link href=../architecture/ rel=prev><link href=../sponsors/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Customers - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#customers class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Customers </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-cLine truncated
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/customers/" rel="canonical"><link href=../architecture/ rel=prev><link href=../sponsors/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Customers - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#customers class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Customers </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-cLine truncated
|
||||
+2
-2
@@ -21,10 +21,10 @@ ABI tags are not covered and may show raw internal fields instead. To generate a
|
||||
```
|
||||
|
||||
3. Generate a Natvis file with the tags of your configuration, for example for `JSON_DIAGNOSTICS`,
|
||||
`JSON_DIAGNOSTIC_POSITIONS`, and `JSON_VIEW_NO_SIMD`:
|
||||
`JSON_DIAGNOSTIC_POSITIONS`, and `JSON_NO_SIMD`:
|
||||
|
||||
```shell
|
||||
make natvis NATVIS_ARGS="--abi-tags _diag,_dp,_vns --output my_nlohmann_json.natvis"
|
||||
make natvis NATVIS_ARGS="--abi-tags _diag,_dp,_ns --output my_nlohmann_json.natvis"
|
||||
```
|
||||
|
||||
4. Use the generated file instead of `nlohmann_json.natvis`.
|
||||
|
||||
@@ -1,3 +1,3 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/debugging/" rel="canonical"><link href=../sponsors/ rel=prev><link href=../../features/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Debugging - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#debugging class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Debugging </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-coLine truncated
|
||||
</code></pre></div> </li> <li> <p>Generate a Natvis file with the tags of your configuration, for example for <code>JSON_DIAGNOSTICS</code>, <code>JSON_DIAGNOSTIC_POSITIONS</code>, and <code>JSON_VIEW_NO_SIMD</code>:</p> <div class=highlight><pre><span></span><code>make<span class=w> </span>natvis<span class=w> </span><span class=nv>NATVIS_ARGS</span><span class=o>=</span><span class=s2>"--abi-tags _diag,_dp,_vns --output my_nlohmann_json.natvis"</span>
|
||||
</code></pre></div> </li> <li> <p>Use the generated file instead of <code>nlohmann_json.natvis</code>.</p> </li> </ol> <p><code>--abi-tags</code> can be repeated for several configurations, and <code>--all</code> generates every combination (about 60 MB for 12 ABI tags, doubling with each further tag). See <a href="https://github.com/nlohmann/json/tree/develop/tools/generate_natvis"><code>tools/generate_natvis</code></a> for all options.</p> <p>Debug engines that wrap LLDB instead of the <abbr title="Microsoft Visual C++">MSVC</abbr> debug engine (for example, <code>codelldb</code> in VS Code) only have partial/experimental Natvis support, and commonly fall back to showing raw internal fields even with the <code>.natvis</code> file present. Switching to <code>cppvsdbg</code> where available, or checking your debug extension's own Natvis support/version, are the next things to try if this happens. There is currently no bundled LLDB-native pretty-printer script in this repository.</p> <h2 id=gdb>GDB<a class=headerlink href=#gdb title="Permanent link">¶</a></h2> <p>The repository ships a <a href="https://github.com/nlohmann/json/tree/develop/tools/gdb_pretty_printer">GDB Python pretty printer</a> under <code>tools/gdb_pretty_printer</code>, with its own usage instructions in that directory's <code>README.md</code>.</p> <h2 id=extended-exception-diagnostics>Extended exception diagnostics<a class=headerlink href=#extended-exception-diagnostics title="Permanent link">¶</a></h2> <p>Defining <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> before including the library augments <code>type_error</code>/<code>out_of_range</code>-style exceptions with a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer to the offending value, which can help pinpoint where in a large document a runtime error occurred. This only applies to exceptions thrown <em>after</em> a value exists (e.g. during element access); parse errors, which happen before any value exists to point at, are not covered by this mechanism -- see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a> for how parse errors report their own location instead.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 25, 2026 05:18:07 UTC">October 25, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67Line truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/debugging/" rel="canonical"><link href=../sponsors/ rel=prev><link href=../../features/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Debugging - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-coLine truncated
|
||||
</code></pre></div> </li> <li> <p>Generate a Natvis file with the tags of your configuration, for example for <code>JSON_DIAGNOSTICS</code>, <code>JSON_DIAGNOSTIC_POSITIONS</code>, and <code>JSON_NO_SIMD</code>:</p> <div class=highlight><pre><span></span><code>make<span class=w> </span>natvis<span class=w> </span><span class=nv>NATVIS_ARGS</span><span class=o>=</span><span class=s2>"--abi-tags _diag,_dp,_ns --output my_nlohmann_json.natvis"</span>
|
||||
</code></pre></div> </li> <li> <p>Use the generated file instead of <code>nlohmann_json.natvis</code>.</p> </li> </ol> <p><code>--abi-tags</code> can be repeated for several configurations, and <code>--all</code> generates every combination (about 60 MB for 12 <abbr title="Application Binary Interface">ABI</abbr> tags, doubling with each further tag). See <a href="https://github.com/nlohmann/json/tree/develop/tools/generate_natvis"><code>tools/generate_natvis</code></a> for all options.</p> <p>Debug engines that wrap <abbr title="LLVM Debugger">LLDB</abbr> instead of the <abbr title="Microsoft Visual C++">MSVC</abbr> debug engine (for example, <code>codelldb</code> in VS Code) only have partial/experimental Natvis support, and commonly fall back to showing raw internal fields even with the <code>.natvis</code> file present. Switching to <code>cppvsdbg</code> where available, or checking your debug extension's own Natvis support/version, are the next things to try if this happens. There is currently no bundled <abbr title="LLVM Debugger">LLDB</abbr>-native pretty-printer script in this repository.</p> <h2 id=gdb><abbr title="GNU Debugger">GDB</abbr><a class=headerlink href=#gdb title="Permanent link">¶</a></h2> <p>The repository ships a <a href="https://github.com/nlohmann/json/tree/develop/tools/gdb_pretty_printer"><abbr title="GNU Debugger">GDB</abbr> Python pretty printer</a> under <code>tools/gdb_pretty_printer</code>, with its own usage instructions in that directory's <code>README.md</code>.</p> <h2 id=extended-exception-diagnostics>Extended exception diagnostics<a class=headerlink href=#extended-exception-diagnostics title="Permanent link">¶</a></h2> <p>Defining <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> before including the library augments <code>type_error</code>/<code>out_of_range</code>-style exceptions with a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer to the offending value, which can help pinpoint where in a large document a runtime error occurred. This only applies to exceptions thrown <em>after</em> a value exists (e.g. during element access); parse errors, which happen before any value exists to point at, are not covered by this mechanism -- see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a> for how parse errors report their own location instead.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 26, 2026 19:13:31 UTC">October 26, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27Line truncated
|
||||
@@ -16,10 +16,10 @@ The checked-in visualizers cover namespace variants with zero, one, or two ABI t
|
||||
make natvis NATVIS_ARGS="--list-tags"
|
||||
```
|
||||
|
||||
1. Generate a Natvis file with the tags of your configuration, for example for `JSON_DIAGNOSTICS`, `JSON_DIAGNOSTIC_POSITIONS`, and `JSON_VIEW_NO_SIMD`:
|
||||
1. Generate a Natvis file with the tags of your configuration, for example for `JSON_DIAGNOSTICS`, `JSON_DIAGNOSTIC_POSITIONS`, and `JSON_NO_SIMD`:
|
||||
|
||||
```
|
||||
make natvis NATVIS_ARGS="--abi-tags _diag,_dp,_vns --output my_nlohmann_json.natvis"
|
||||
make natvis NATVIS_ARGS="--abi-tags _diag,_dp,_ns --output my_nlohmann_json.natvis"
|
||||
```
|
||||
|
||||
1. Use the generated file instead of `nlohmann_json.natvis`.
|
||||
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/design_goals/" rel="canonical"><link href=../releases/v1.0.0/ rel=prev><link href=../architecture/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Design goals - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#design-goals class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Design goals </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=Line truncated
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/design_goals/" rel="canonical"><link href=../releases/v1.0.0/ rel=prev><link href=../architecture/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Design goals - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Design goals </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=Line truncated
|
||||
+82
-31
@@ -39,6 +39,8 @@ classDiagram
|
||||
|
||||
Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag `-fno-exceptions` or by defining the symbol [`JSON_NOEXCEPTION`](../api/macros/json_noexception.md). In this case, exceptions are replaced by `abort()` calls. You can further control this behavior by defining `JSON_THROW_USER` (overriding `#!cpp throw`), `JSON_TRY_USER` (overriding `#!cpp try`), and `JSON_CATCH_USER` (overriding `#!cpp catch`).
|
||||
|
||||
See [Working without exceptions](../features/no_exceptions.md) for the functions that report errors without throwing.
|
||||
|
||||
Note that [`JSON_THROW_USER`](../api/macros/json_throw_user.md) should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.
|
||||
|
||||
??? example "Example: switch off exceptions and log errors before aborting"
|
||||
@@ -73,7 +75,7 @@ Exceptions in the library are thrown in the local context of the JSON value they
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -114,7 +116,7 @@ As this global context comes at the price of storing one additional pointer per
|
||||
# define JSON_DIAGNOSTICS 1
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -171,7 +173,7 @@ Exceptions have ids 1xx.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -185,7 +187,7 @@ Exceptions have ids 1xx.
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << '\n'
|
||||
<< "byte position of error: " << e.byte << std::endl;
|
||||
<< "byte position of error: " << e.byte << '\n';
|
||||
}
|
||||
}
|
||||
|
||||
@@ -260,6 +262,34 @@ This error indicates a syntax error while deserializing a JSON text. The error m
|
||||
- Make sure the input is correctly read. Try to write the input to standard output to check if, for instance, the input file was successfully opened.
|
||||
- Paste the input to a JSON validator like <https://jsonlint.com> or a tool like [jq](https://jqlang.github.io/jq/).
|
||||
|
||||
??? info "Parsing a file fails at line 1, column 1 (unexpected end of input)"
|
||||
|
||||
The messages `attempting to parse an empty input` (since version 3.11.3) and `unexpected end of input` (also the message of
|
||||
earlier versions for an empty input) at the very start of the input mean
|
||||
that the parser did not see a single character. The library only reads from the stream it is given: it does not
|
||||
open files and cannot tell a missing file from an empty one. The usual causes are:
|
||||
|
||||
- **The file was not opened.** A relative path is resolved against the *working directory of the running program*,
|
||||
not against the source file or the project. IDEs and build tools often start the program in a build directory
|
||||
(for example `build/` or `cmake-build-debug/`), so `"example.json"` may need to be `"../example.json"`. Use an
|
||||
absolute path to rule this out.
|
||||
- **The file is empty**, or a previous run truncated it (for example when it was opened for writing).
|
||||
- **The stream was already read.** A stream whose content has been consumed (by printing it with
|
||||
`std::cout << file.rdbuf()`, or by an earlier `accept`/`parse`/`>>`) is at its end. Parse it once, or rewind it
|
||||
with `seekg(0)` after clearing the state with `clear()`.
|
||||
|
||||
Check the stream before parsing it:
|
||||
|
||||
```cpp
|
||||
std::ifstream f("example.json");
|
||||
if (!f.is_open())
|
||||
{
|
||||
std::cerr << "cannot open example.json\n";
|
||||
return 1;
|
||||
}
|
||||
json data = json::parse(f);
|
||||
```
|
||||
|
||||
### json.exception.parse_error.102
|
||||
|
||||
JSON uses the `\uxxxx` format to describe Unicode characters. Code points above 0xFFFF are split into two `\uxxxx` entries ("surrogate pairs"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.
|
||||
@@ -367,7 +397,7 @@ where they cannot be resolved.
|
||||
### json.exception.parse_error.110
|
||||
|
||||
When parsing a [binary format](../features/binary_formats/index.md), the byte vector ends before the complete value has
|
||||
been read.
|
||||
been read, or (with `strict = true`) further bytes follow the value.
|
||||
|
||||
!!! failure "Example messages"
|
||||
|
||||
@@ -383,7 +413,7 @@ been read.
|
||||
|
||||
### json.exception.parse_error.112
|
||||
|
||||
An unexpected byte was read in a [binary format](../features/binary_formats/index.md) or length information is invalid ([BSON](../features/binary_formats/bson.md)).
|
||||
An unexpected byte was read in a [binary format](../features/binary_formats/index.md) or length information is invalid ([BSON](../features/binary_formats/bson.md)). In [BON8](../features/binary_formats/bon8.md), this exception is also thrown for a key that is not a string and for ill-formed UTF-8.
|
||||
|
||||
!!! failure "Example messages"
|
||||
|
||||
@@ -408,15 +438,21 @@ An unexpected byte was read in a [binary format](../features/binary_formats/inde
|
||||
```
|
||||
[json.exception.parse_error.112] parse error at byte 5: syntax error while parsing BSON document: document size 6 does not match the number of bytes read (5)
|
||||
```
|
||||
```
|
||||
[json.exception.parse_error.112] parse error at byte 2: syntax error while parsing BON8 string: invalid UTF-8 byte: 0x80
|
||||
```
|
||||
|
||||
### json.exception.parse_error.113
|
||||
|
||||
A string could not be read from a [binary format](../features/binary_formats/index.md): either a value that is not a
|
||||
string was read where one was required (for instance as a map key), the string's length specification is invalid, or
|
||||
the string's bytes are not valid UTF-8 and the `error_handler` parameter of the corresponding `from_*` function is
|
||||
set to `strict`. By default (`error_handler_t::keep`), the bytes of a string are not checked for valid UTF-8 on read;
|
||||
see the ill-formed UTF-8 notes on the individual [binary format](../features/binary_formats/index.md) pages for how
|
||||
set to `strict`. By default (`error_handler_t::keep`), the bytes of a string are not checked for valid UTF-8 on read.
|
||||
This applies to the `from_*` functions that have an `error_handler` parameter; `from_bon8` does not have one.
|
||||
See the ill-formed UTF-8 notes on the individual [binary format](../features/binary_formats/index.md) pages for how
|
||||
such a string is handled depending on `error_handler`.
|
||||
[`from_bon8()`](../api/basic_json/from_bon8.md) never throws this exception: BON8 non-string keys and ill-formed UTF-8
|
||||
are reported as [parse_error.112](#jsonexceptionparse_error112).
|
||||
|
||||
CBOR and MessagePack allow map keys of any type, but JSON object keys are always strings. Maps with keys of any other
|
||||
type (for instance integers or `null`) are therefore not supported; see the notes on
|
||||
@@ -455,13 +491,16 @@ The parsing of the corresponding BSON record type is not implemented (yet).
|
||||
|
||||
### json.exception.parse_error.115
|
||||
|
||||
A UBJSON high-precision number could not be parsed.
|
||||
A UBJSON or BJData high-precision number could not be parsed.
|
||||
|
||||
!!! failure "Example message"
|
||||
!!! failure "Example messages"
|
||||
|
||||
```
|
||||
[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A
|
||||
```
|
||||
```
|
||||
[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing BJData high-precision number: invalid number text: 1A
|
||||
```
|
||||
|
||||
### json.exception.parse_error.116
|
||||
|
||||
@@ -495,7 +534,7 @@ Exceptions have ids 2xx.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -510,7 +549,7 @@ Exceptions have ids 2xx.
|
||||
{
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << std::endl;
|
||||
<< "exception id: " << e.id << '\n';
|
||||
}
|
||||
}
|
||||
|
||||
@@ -682,7 +721,7 @@ Exceptions have ids 3xx.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -696,7 +735,7 @@ Exceptions have ids 3xx.
|
||||
{
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << std::endl;
|
||||
<< "exception id: " << e.id << '\n';
|
||||
}
|
||||
}
|
||||
|
||||
@@ -894,6 +933,9 @@ The binary writers [`to_cbor()`](../api/basic_json/to_cbor.md), [`to_ubjson()`](
|
||||
as well for a string value or object key that is not valid UTF-8 if their `error_handler` is `strict` (the default if
|
||||
[`JSON_STRICT_BINARY_UTF8`](../api/macros/json_strict_binary_utf8.md) is enabled). So does
|
||||
[`to_msgpack()`](../api/basic_json/to_msgpack.md) if `error_handler_t::strict` is passed.
|
||||
[`to_bon8()`](../api/basic_json/to_bon8.md) always throws this exception for such a string or key, regardless of
|
||||
[`JSON_STRICT_BINARY_UTF8`](../api/macros/json_strict_binary_utf8.md), because the end of a BON8 string is determined
|
||||
from its UTF-8 encoding.
|
||||
|
||||
!!! failure "Example message"
|
||||
|
||||
@@ -965,17 +1007,12 @@ from JSON text.
|
||||
|
||||
[`basic_json_document::save()`](../api/basic_json_document/save.md) cannot write an
|
||||
[image](../features/json_view.md#images) of a [discarded](../api/basic_json_document/is_discarded.md) document.
|
||||
[`save()`](../api/basic_json_document/save.md) and [`load()`](../api/basic_json_document/load.md) also throw this
|
||||
exception on a big-endian target, since the image format is little-endian only.
|
||||
|
||||
!!! failure "Example messages"
|
||||
|
||||
```
|
||||
[json.exception.type_error.320] cannot save a discarded json_document
|
||||
```
|
||||
```
|
||||
[json.exception.type_error.320] json_document images need a little-endian target
|
||||
```
|
||||
|
||||
!!! note
|
||||
|
||||
@@ -1009,7 +1046,7 @@ Exceptions have ids 4xx.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -1023,7 +1060,7 @@ Exceptions have ids 4xx.
|
||||
{
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << std::endl;
|
||||
<< "exception id: " << e.id << '\n';
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1110,7 +1147,8 @@ double-precision number when `number_float_t` is `#!cpp float`.
|
||||
An integer number cannot be represented by the binary format it is serialized to:
|
||||
|
||||
- [BON8](../features/binary_formats/bon8.md) only stores integers that fit into int64, so
|
||||
[`to_bon8`](../api/basic_json/to_bon8.md) throws for unsigned integers greater than 9223372036854775807.
|
||||
[`to_bon8`](../api/basic_json/to_bon8.md) throws for unsigned integers greater than 9223372036854775807 and, with a
|
||||
number type wider than 64 bits, for any integer outside the int64 range.
|
||||
- [CBOR](../features/binary_formats/cbor.md), [MessagePack](../features/binary_formats/messagepack.md), and
|
||||
[BSON](../features/binary_formats/bson.md) store integers in at most 64 bits. With the default number types, every
|
||||
integer fits, but a [`number_integer_t`](../api/basic_json/number_integer_t.md) or
|
||||
@@ -1129,7 +1167,7 @@ exception, because they serialize integers beyond 64 bits as high-precision numb
|
||||
- Since version 3.12.0, integer numbers beyond int64 are serialized as uint64 BSON numbers.
|
||||
|
||||
Before version 3.13.0, CBOR, MessagePack, and BSON silently truncated integers wider than 64 bits, and BJData
|
||||
truncated unsigned integers wider than 64 bits.
|
||||
truncated unsigned integers wider than 64 bits that were elements of ND-arrays with `"_ArrayType_": "uint64"`.
|
||||
|
||||
!!! failure "Example messages"
|
||||
|
||||
@@ -1149,8 +1187,8 @@ or the encoded length for [CBOR](../features/binary_formats/cbor.md).
|
||||
The exception is also thrown for a [UBJSON](../features/binary_formats/ubjson.md) array of a type that is encoded by its
|
||||
marker alone (`Z`, `T` or `F`) whose declared count exceeds 1,048,576 (`1 << 20`). Such an array has no payload, so its
|
||||
count alone decides how much memory is allocated, and a handful of bytes would otherwise describe billions of values.
|
||||
[`to_ubjson`](../api/basic_json/to_ubjson.md) writes longer arrays of these types without the size and type annotation,
|
||||
so any value it produces can still be read back.
|
||||
[`to_ubjson`](../api/basic_json/to_ubjson.md) writes longer arrays of these types without the `$` type annotation (the `#`
|
||||
count and one marker per element are kept), so any value it produces can still be read back.
|
||||
|
||||
!!! failure "Example messages"
|
||||
|
||||
@@ -1187,9 +1225,14 @@ a JSON pointer exceeds the range of `size_type` (e.g., on 32-bit platforms).
|
||||
|
||||
```
|
||||
enum value out of range
|
||||
array index 18446744073709551616 exceeds size_type
|
||||
array index 18446744073709551615 exceeds size_type
|
||||
```
|
||||
|
||||
The second message is thrown, for instance, by `#!cpp json::parse("[1, 2]").at("/18446744073709551615"_json_pointer)`
|
||||
on a 64-bit platform, where `size_type` is `#!cpp std::size_t` and this index is `SIZE_MAX`. An index that does not
|
||||
fit into 64 bits (such as `18446744073709551616`) is not reported as 410 but as
|
||||
[`out_of_range.404`](#jsonexceptionout_of_range404).
|
||||
|
||||
### json.exception.out_of_range.411
|
||||
|
||||
A JSON Patch `add` operation cannot be applied because the target location's parent is neither an object nor an array. Per [RFC 6902](https://datatracker.ietf.org/doc/html/rfc6902), an `add` target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) cannot receive a new member or element.
|
||||
@@ -1204,6 +1247,8 @@ A JSON Patch `add` operation cannot be applied because the target location's par
|
||||
|
||||
This exception was added in version 3.13.0. Before that, this situation hit an internal assertion (aborting the program in debug builds) or was silently ignored when assertions were disabled.
|
||||
|
||||
A `null` parent is rejected as well. Before version 3.13.0, an `add` into a `null` parent silently converted it to an object (e.g., `add` at `/foo/bar` turned `{"foo":null}` into `{"foo":{"bar":1}}`).
|
||||
|
||||
### json.exception.out_of_range.412
|
||||
|
||||
BSON stores the length of documents, arrays, strings, and binary values in a signed 32-bit integer, and MessagePack
|
||||
@@ -1257,14 +1302,18 @@ A JSON Patch `move` operation's `"from"` location is a proper prefix of its `"pa
|
||||
### json.exception.out_of_range.415
|
||||
|
||||
MessagePack's ext type and BSON's binary subtype are each stored in a single byte. This exception is thrown when serializing a
|
||||
[`byte_container_with_subtype`](../api/byte_container_with_subtype/index.md) whose subtype exceeds 255.
|
||||
[`byte_container_with_subtype`](../api/byte_container_with_subtype/index.md) whose subtype exceeds 255, the largest value the library can store in that byte.
|
||||
|
||||
!!! failure "Example message"
|
||||
!!! failure "Example messages"
|
||||
|
||||
```
|
||||
[json.exception.out_of_range.415] subtype 70000 is too large for the MessagePack ext type (max 255)
|
||||
```
|
||||
|
||||
```
|
||||
[json.exception.out_of_range.415] subtype 70000 is too large for the BSON binary subtype (max 255)
|
||||
```
|
||||
|
||||
!!! note
|
||||
|
||||
This exception was added in version 3.13.0. Before that, subtypes above 255 were silently truncated modulo 256 instead of raising an error.
|
||||
@@ -1312,7 +1361,7 @@ Exceptions have ids 5xx.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
using namespace nlohmann::literals;
|
||||
|
||||
int main()
|
||||
@@ -1336,7 +1385,7 @@ Exceptions have ids 5xx.
|
||||
{
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << std::endl;
|
||||
<< "exception id: " << e.id << '\n';
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1365,7 +1414,9 @@ A JSON Patch operation 'test' failed. The unsuccessful operation is also printed
|
||||
### json.exception.other_error.502
|
||||
|
||||
[`to_ubjson`](../api/basic_json/to_ubjson.md) and [`to_bjdata`](../api/basic_json/to_bjdata.md) were called with
|
||||
`use_type = true` but `use_size = false`. UBJSON requires a size marker (`#`) after a type marker (`$`).
|
||||
`use_type = true` but `use_size = false`, and the value contains a non-empty array or object (or, with BJData Draft 3,
|
||||
any binary value). UBJSON requires a size marker (`#`) after a type marker (`$`); scalars and empty arrays or objects
|
||||
do not throw.
|
||||
|
||||
!!! failure "Example message"
|
||||
|
||||
|
||||
+42
-33
@@ -1,4 +1,4 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/exceptions/" rel="canonical"><link href=../faq/ rel=prev><link href=../releases/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Exceptions - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#exceptions class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Exceptions </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-componLine truncated
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/exceptions/" rel="canonical"><link href=../faq/ rel=prev><link href=../releases/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Exceptions - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new URL("../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#exceptions class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Exceptions </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-componLine truncated
|
||||
direction LR
|
||||
class `std::exception` {
|
||||
<<interface>>
|
||||
@@ -23,7 +23,7 @@
|
||||
`json::exception` <|-- `json::invalid_iterator`
|
||||
`json::exception` <|-- `json::type_error`
|
||||
`json::exception` <|-- `json::out_of_range`
|
||||
`json::exception` <|-- `json::other_error`</code></pre> <h3 id=switch-off-exceptions>Switch off exceptions<a class=headerlink href=#switch-off-exceptions title="Permanent link">¶</a></h3> <p>Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag <code>-fno-exceptions</code> or by defining the symbol <a href=../../api/macros/json_noexception/ ><code>JSON_NOEXCEPTION</code></a>. In this case, exceptions are replaced by <code>abort()</code> calls. You can further control this behavior by defining <code>JSON_THROW_USER</code> (overriding <code class=highlight><span class=k>throw</span></code>), <code>JSON_TRY_USER</code> (overriding <code class=highlight><span class=k>try</span></code>), and <code>JSON_CATCH_USER</code> (overriding <code class=highlight><span class=k>catch</span></code>).</p> <p>Note that <a href=../../api/macros/json_throw_user/ ><code>JSON_THROW_USER</code></a> should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.</p> <details class=example> <summary>Example: switch off exceptions and log errors before aborting</summary> <p>The code below switches off exceptions and creates a log entry with a detailed error message in case of errors.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
`json::exception` <|-- `json::other_error`</code></pre> <h3 id=switch-off-exceptions>Switch off exceptions<a class=headerlink href=#switch-off-exceptions title="Permanent link">¶</a></h3> <p>Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag <code>-fno-exceptions</code> or by defining the symbol <a href=../../api/macros/json_noexception/ ><code>JSON_NOEXCEPTION</code></a>. In this case, exceptions are replaced by <code>abort()</code> calls. You can further control this behavior by defining <code>JSON_THROW_USER</code> (overriding <code class=highlight><span class=k>throw</span></code>), <code>JSON_TRY_USER</code> (overriding <code class=highlight><span class=k>try</span></code>), and <code>JSON_CATCH_USER</code> (overriding <code class=highlight><span class=k>catch</span></code>).</p> <p>See <a href=../../features/no_exceptions/ >Working without exceptions</a> for the functions that report errors without throwing.</p> <p>Note that <a href=../../api/macros/json_throw_user/ ><code>JSON_THROW_USER</code></a> should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.</p> <details class=example> <summary>Example: switch off exceptions and log errors before aborting</summary> <p>The code below switches off exceptions and creates a log entry with a detailed error message in case of errors.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
|
||||
<span class=cp>#define JSON_TRY_USER if(true)</span>
|
||||
<span class=cp>#define JSON_CATCH_USER(exception) if(false)</span>
|
||||
@@ -37,7 +37,7 @@
|
||||
</code></pre></div> </details> <p>Note the explanatory <a href="https://en.cppreference.com/w/cpp/error/exception/what"><code>what()</code></a> string of exceptions is not available for <abbr title="Microsoft Visual C++">MSVC</abbr> if exceptions are disabled, see <a href="https://github.com/nlohmann/json/discussions/2824">#2824</a>.</p> <p>See <a href=../../api/macros/json_throw_user/ >documentation of <code>JSON_TRY_USER</code>, <code>JSON_CATCH_USER</code> and <code>JSON_THROW_USER</code></a> for more information.</p> <h3 id=extended-diagnostic-messages>Extended diagnostic messages<a class=headerlink href=#extended-diagnostic-messages title="Permanent link">¶</a></h3> <p>Exceptions in the library are thrown in the local context of the <abbr title="JavaScript Object Notation">JSON</abbr> value they are detected. This makes detailed diagnostics messages, and hence debugging, difficult.</p> <details class=example> <summary>Example: standard diagnostic message</summary> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
<span class=p>{</span>
|
||||
@@ -60,7 +60,7 @@
|
||||
<span class=cp># define JSON_DIAGNOSTICS 1</span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
<span class=p>{</span>
|
||||
@@ -81,7 +81,7 @@
|
||||
</code></pre></div> <p>Now the exception message contains a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer <code>/address/housenumber</code> that indicates which value has the wrong type.</p> </details> <p>See <a href=../../api/macros/json_diagnostics/ >documentation of <code>JSON_DIAGNOSTICS</code></a> for more information, and <a href=../debugging/ >Debugging</a> for the debugger integrations of the library.</p> <h2 id=parse-errors>Parse errors<a class=headerlink href=#parse-errors title="Permanent link">¶</a></h2> <p>The library throws this exception when a parse error occurs. Parse errors can occur during the deserialization of <abbr title="JavaScript Object Notation">JSON</abbr> text or of one of the binary formats (<abbr title="Binary JData">BJData</abbr>, <abbr title="Binary Object Notation 8">BON8</abbr>, <abbr title="Binary JSON">BSON</abbr>, <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, <abbr title="Universal Binary JSON">UBJSON</abbr>), as well as when using <abbr title="JavaScript Object Notation">JSON</abbr> Patch.</p> <p>Exceptions have ids 1xx.</p> <div class="admonition info"> <p class=admonition-title>Byte index</p> <p>Member <code>byte</code> holds the byte index of the last read character in the input file.</p> <p>For an input with n bytes, 1 is the index of the first character and n+1 is the index of the terminating null byte or the end of file. This also holds true when reading a byte vector (<abbr title="Concise Binary Object Representation">CBOR</abbr> or MessagePack).</p> </div> <details class=example> <summary>Example: catch a <code>parse_error</code> exception</summary> <p>The following code shows how a <code>parse_error</code> exception can be caught.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
<span class=p>{</span>
|
||||
@@ -95,7 +95,7 @@
|
||||
<span class=w> </span><span class=c1>// output exception information</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"message: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>what</span><span class=p>()</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"byte position of error: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=kt>byte</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>endl</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"byte position of error: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=kt>byte</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code>message: [json.exception.parse_error.101] parse error at line 1, column 8: syntax error while parsing value - unexpected ']'; expected '[', '{', or a literal
|
||||
@@ -109,7 +109,14 @@ byte position of error: 8
|
||||
</code></pre></div> <p><code>\u</code> was not be followed by four hex digits:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 6: syntax error while parsing value - invalid string: '\u' must be followed by 4 hex digits; last read: '"\u01"'
|
||||
</code></pre></div> <p>Invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8 surrogate pair:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 13: syntax error while parsing value - invalid string: surrogate U+DC00..U+DFFF must follow U+D800..U+DBFF; last read: '"\uD7FF\uDC00'"
|
||||
</code></pre></div> <p>Invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8 byte:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 3, column 24: syntax error while parsing value - invalid string: ill-formed UTF-8 byte; last read: '"vous \352t'
|
||||
</code></pre></div> </div> <div class="admonition tip"> <p class=admonition-title>Tip</p> <ul> <li>Make sure the input is correctly read. Try to write the input to standard output to check if, for instance, the input file was successfully opened.</li> <li>Paste the input to a <abbr title="JavaScript Object Notation">JSON</abbr> validator like <a href="https://jsonlint.com">https://jsonlint.com</a> or a tool like <a href="https://jqlang.github.io/jq/">jq</a>.</li> </ul> </div> <h3 id=jsonexceptionparse_error102>json.exception.parse_error.102<a class=headerlink href=#jsonexceptionparse_error102 title="Permanent link">¶</a></h3> <p><abbr title="JavaScript Object Notation">JSON</abbr> uses the <code>\uxxxx</code> format to describe Unicode characters. Code points above 0xFFFF are split into two <code>\uxxxx</code> entries ("surrogate pairs"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>parse error at 14: missing or wrong low surrogate
|
||||
</code></pre></div> </div> <div class="admonition tip"> <p class=admonition-title>Tip</p> <ul> <li>Make sure the input is correctly read. Try to write the input to standard output to check if, for instance, the input file was successfully opened.</li> <li>Paste the input to a <abbr title="JavaScript Object Notation">JSON</abbr> validator like <a href="https://jsonlint.com">https://jsonlint.com</a> or a tool like <a href="https://jqlang.github.io/jq/">jq</a>.</li> </ul> </div> <details class=info> <summary>Parsing a file fails at line 1, column 1 (unexpected end of input)</summary> <p>The messages <code>attempting to parse an empty input</code> (since version 3.11.3) and <code>unexpected end of input</code> (also the message of earlier versions for an empty input) at the very start of the input mean that the parser did not see a single character. The library only reads from the stream it is given: it does not open files and cannot tell a missing file from an empty one. The usual causes are:</p> <ul> <li><strong>The file was not opened.</strong> A relative path is resolved against the <em>working directory of the running program</em>, not against the source file or the project. IDEs and build tools often start the program in a build directory (for example <code>build/</code> or <code>cmake-build-debug/</code>), so <code>"example.json"</code> may need to be <code>"../example.json"</code>. Use an absolute path to rule this out.</li> <li><strong>The file is empty</strong>, or a previous run truncated it (for example when it was opened for writing).</li> <li><strong>The stream was already read.</strong> A stream whose content has been consumed (by printing it with <code>std::cout << file.rdbuf()</code>, or by an earlier <code>accept</code>/<code>parse</code>/<code>>></code>) is at its end. Parse it once, or rewind it with <code>seekg(0)</code> after clearing the state with <code>clear()</code>.</li> </ul> <p>Check the stream before parsing it:</p> <div class=highlight><pre><span></span><code><span class=n>std</span><span class=o>::</span><span class=n>ifstream</span><span class=w> </span><span class=n>f</span><span class=p>(</span><span class=s>"example.json"</span><span class=p>);</span>
|
||||
<span class=k>if</span><span class=w> </span><span class=p>(</span><span class=o>!</span><span class=n>f</span><span class=p>.</span><span class=n>is_open</span><span class=p>())</span>
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cerr</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"cannot open example.json</span><span class=se>\n</span><span class=s>"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=k>return</span><span class=w> </span><span class=mi>1</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
<span class=n>json</span><span class=w> </span><span class=n>data</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=n>f</span><span class=p>);</span>
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionparse_error102>json.exception.parse_error.102<a class=headerlink href=#jsonexceptionparse_error102 title="Permanent link">¶</a></h3> <p><abbr title="JavaScript Object Notation">JSON</abbr> uses the <code>\uxxxx</code> format to describe Unicode characters. Code points above 0xFFFF are split into two <code>\uxxxx</code> entries ("surrogate pairs"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>parse error at 14: missing or wrong low surrogate
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception is not used any more. Instead <a href=#jsonexceptionparse_error101>json.exception.parse_error.101</a> with a more detailed description is used.</p> </div> <h3 id=jsonexceptionparse_error103>json.exception.parse_error.103<a class=headerlink href=#jsonexceptionparse_error103 title="Permanent link">¶</a></h3> <p>Unicode supports code points up to 0x10FFFF. Code points above 0x10FFFF are invalid.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>parse error: code points above 0x10FFFF are invalid
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception is not used any more. Instead <a href=#jsonexceptionparse_error101>json.exception.parse_error.101</a> with a more detailed description is used.</p> </div> <h3 id=jsonexceptionparse_error104>json.exception.parse_error.104<a class=headerlink href=#jsonexceptionparse_error104 title="Permanent link">¶</a></h3> <p><a href="https://tools.ietf.org/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a> requires a <abbr title="JavaScript Object Notation">JSON</abbr> Patch document to be a <abbr title="JavaScript Object Notation">JSON</abbr> document that represents an array of objects.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.104] parse error: JSON patch must be an array of objects
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error105>json.exception.parse_error.105<a class=headerlink href=#jsonexceptionparse_error105 title="Permanent link">¶</a></h3> <p>An operation of a <abbr title="JavaScript Object Notation">JSON</abbr> Patch document must contain exactly one "op" member, whose value indicates the operation to perform. Its value must be one of "add", "remove", "replace", "move", "copy", or "test"; other values are errors.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.105] parse error: operation 'add' must have member 'value'
|
||||
@@ -120,29 +127,31 @@ byte position of error: 8
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error108>json.exception.parse_error.108<a class=headerlink href=#jsonexceptionparse_error108 title="Permanent link">¶</a></h3> <p>In a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer, only <code>~0</code> and <code>~1</code> are valid escape sequences.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.108] parse error: escape character '~' must be followed with '0' or '1'
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error109>json.exception.parse_error.109<a class=headerlink href=#jsonexceptionparse_error109 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Pointer array index must be a number. This exception is thrown for an array index that does not begin with a digit, except for <code>-</code> and the empty reference token, which throw <a href=#jsonexceptionout_of_range404><code>out_of_range.404</code></a> where they cannot be resolved.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.109] parse error: array index 'one' is not a number
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.109] parse error: array index '+1' is not a number
|
||||
</code></pre></div></p> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, a one-character array index that is not a digit (e.g., <code>x</code>) threw <a href=#jsonexceptionout_of_range404><code>out_of_range.404</code></a> instead.</p> </div> <h3 id=jsonexceptionparse_error110>json.exception.parse_error.110<a class=headerlink href=#jsonexceptionparse_error110 title="Permanent link">¶</a></h3> <p>When parsing a <a href=../../features/binary_formats/ >binary format</a>, the byte vector ends before the complete value has been read.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.110] parse error at byte 5: syntax error while parsing CBOR string: unexpected end of input
|
||||
</code></pre></div></p> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, a one-character array index that is not a digit (e.g., <code>x</code>) threw <a href=#jsonexceptionout_of_range404><code>out_of_range.404</code></a> instead.</p> </div> <h3 id=jsonexceptionparse_error110>json.exception.parse_error.110<a class=headerlink href=#jsonexceptionparse_error110 title="Permanent link">¶</a></h3> <p>When parsing a <a href=../../features/binary_formats/ >binary format</a>, the byte vector ends before the complete value has been read, or (with <code>strict = true</code>) further bytes follow the value.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.110] parse error at byte 5: syntax error while parsing CBOR string: unexpected end of input
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.110] parse error at byte 2: syntax error while parsing UBJSON value: expected end of input; last byte: 0x5A
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.110] parse error at byte 8: syntax error while parsing BSON number: unexpected end of input
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionparse_error112>json.exception.parse_error.112<a class=headerlink href=#jsonexceptionparse_error112 title="Permanent link">¶</a></h3> <p>An unexpected byte was read in a <a href=../../features/binary_formats/ >binary format</a> or length information is invalid (<a href=../../features/binary_formats/bson/ ><abbr title="Binary JSON">BSON</abbr></a>).</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 1: syntax error while parsing CBOR value: invalid byte: 0x1C
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionparse_error112>json.exception.parse_error.112<a class=headerlink href=#jsonexceptionparse_error112 title="Permanent link">¶</a></h3> <p>An unexpected byte was read in a <a href=../../features/binary_formats/ >binary format</a> or length information is invalid (<a href=../../features/binary_formats/bson/ ><abbr title="Binary JSON">BSON</abbr></a>). In <a href=../../features/binary_formats/bon8/ ><abbr title="Binary Object Notation 8">BON8</abbr></a>, this exception is also thrown for a key that is not a string and for ill-formed <abbr title="Unicode Transformation Format">UTF</abbr>-8.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 1: syntax error while parsing CBOR value: invalid byte: 0x1C
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 1: syntax error while parsing MessagePack value: invalid byte: 0xC1
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 4: syntax error while parsing BJData size: expected '#' after type information; last byte: 0x02
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 4: syntax error while parsing UBJSON size: expected '#' after type information; last byte: 0x02
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 10: syntax error while parsing BSON string: string length must be at least 1, is -2147483648
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 15: syntax error while parsing BSON binary: byte array length cannot be negative, is -1
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 5: syntax error while parsing BSON document: document size 6 does not match the number of bytes read (5)
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionparse_error113>json.exception.parse_error.113<a class=headerlink href=#jsonexceptionparse_error113 title="Permanent link">¶</a></h3> <p>A string could not be read from a <a href=../../features/binary_formats/ >binary format</a>: either a value that is not a string was read where one was required (for instance as a map key), the string's length specification is invalid, or the string's bytes are not valid <abbr title="Unicode Transformation Format">UTF</abbr>-8 and the <code>error_handler</code> parameter of the corresponding <code>from_*</code> function is set to <code>strict</code>. By default (<code>error_handler_t::keep</code>), the bytes of a string are not checked for valid <abbr title="Unicode Transformation Format">UTF</abbr>-8 on read; see the ill-formed <abbr title="Unicode Transformation Format">UTF</abbr>-8 notes on the individual <a href=../../features/binary_formats/ >binary format</a> pages for how such a string is handled depending on <code>error_handler</code>.</p> <p><abbr title="Concise Binary Object Representation">CBOR</abbr> and MessagePack allow map keys of any type, but <abbr title="JavaScript Object Notation">JSON</abbr> object keys are always strings. Maps with keys of any other type (for instance integers or <code>null</code>) are therefore not supported; see the notes on <a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a> and <a href=../../features/binary_formats/messagepack/ >MessagePack</a>.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.113] parse error at byte 2: syntax error while parsing CBOR object key: only string keys are supported, but found an unsigned integer; last byte: 0x01
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.112] parse error at byte 2: syntax error while parsing BON8 string: invalid UTF-8 byte: 0x80
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionparse_error113>json.exception.parse_error.113<a class=headerlink href=#jsonexceptionparse_error113 title="Permanent link">¶</a></h3> <p>A string could not be read from a <a href=../../features/binary_formats/ >binary format</a>: either a value that is not a string was read where one was required (for instance as a map key), the string's length specification is invalid, or the string's bytes are not valid <abbr title="Unicode Transformation Format">UTF</abbr>-8 and the <code>error_handler</code> parameter of the corresponding <code>from_*</code> function is set to <code>strict</code>. By default (<code>error_handler_t::keep</code>), the bytes of a string are not checked for valid <abbr title="Unicode Transformation Format">UTF</abbr>-8 on read. This applies to the <code>from_*</code> functions that have an <code>error_handler</code> parameter; <code>from_bon8</code> does not have one. See the ill-formed <abbr title="Unicode Transformation Format">UTF</abbr>-8 notes on the individual <a href=../../features/binary_formats/ >binary format</a> pages for how such a string is handled depending on <code>error_handler</code>. <a href=../../api/basic_json/from_bon8/ ><code>from_bon8()</code></a> never throws this exception: <abbr title="Binary Object Notation 8">BON8</abbr> non-string keys and ill-formed <abbr title="Unicode Transformation Format">UTF</abbr>-8 are reported as <a href=#jsonexceptionparse_error112>parse_error.112</a>.</p> <p><abbr title="Concise Binary Object Representation">CBOR</abbr> and MessagePack allow map keys of any type, but <abbr title="JavaScript Object Notation">JSON</abbr> object keys are always strings. Maps with keys of any other type (for instance integers or <code>null</code>) are therefore not supported; see the notes on <a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a> and <a href=../../features/binary_formats/messagepack/ >MessagePack</a>.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.113] parse error at byte 2: syntax error while parsing CBOR object key: only string keys are supported, but found an unsigned integer; last byte: 0x01
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.113] parse error at byte 2: syntax error while parsing MessagePack object key: only string keys are supported, but found nil; last byte: 0xC0
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.113] parse error at byte 2: syntax error while parsing CBOR string: expected length specification (0x60-0x7B) or indefinite string type (0x7F); last byte: 0x7C
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.113] parse error at byte 2: syntax error while parsing UBJSON char: byte after 'C' must be in range 0x00..0x7F; last byte: 0x82
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.113] parse error at byte 3: syntax error while parsing BJData string: string length must not be negative
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.113] parse error at byte 3: syntax error while parsing CBOR string: invalid string: ill-formed UTF-8 byte
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionparse_error114>json.exception.parse_error.114<a class=headerlink href=#jsonexceptionparse_error114 title="Permanent link">¶</a></h3> <p>The parsing of the corresponding <abbr title="Binary JSON">BSON</abbr> record type is not implemented (yet).</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.114] parse error at byte 5: Unsupported BSON record type 0xFF
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error115>json.exception.parse_error.115<a class=headerlink href=#jsonexceptionparse_error115 title="Permanent link">¶</a></h3> <p>A <abbr title="Universal Binary JSON">UBJSON</abbr> high-precision number could not be parsed.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error116>json.exception.parse_error.116<a class=headerlink href=#jsonexceptionparse_error116 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json_document/load/ ><code>basic_json_document::load()</code></a> rejected an <a href=../../features/json_view/#images>image</a>: either the bytes are not one <a href=../../api/basic_json_document/save/ ><code>save()</code></a> could have written (too short, an unknown magic number or format version, or sizes that do not fit the buffer), or they are, but fail the requested <a href=../../api/basic_json_document/load/#image_check><code>image_check</code></a>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.116] parse error: invalid json_document image: the check failed
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error115>json.exception.parse_error.115<a class=headerlink href=#jsonexceptionparse_error115 title="Permanent link">¶</a></h3> <p>A <abbr title="Universal Binary JSON">UBJSON</abbr> or <abbr title="Binary JData">BJData</abbr> high-precision number could not be parsed.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing BJData high-precision number: invalid number text: 1A
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionparse_error116>json.exception.parse_error.116<a class=headerlink href=#jsonexceptionparse_error116 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json_document/load/ ><code>basic_json_document::load()</code></a> rejected an <a href=../../features/json_view/#images>image</a>: either the bytes are not one <a href=../../api/basic_json_document/save/ ><code>save()</code></a> could have written (too short, an unknown magic number or format version, or sizes that do not fit the buffer), or they are, but fail the requested <a href=../../api/basic_json_document/load/#image_check><code>image_check</code></a>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.116] parse error: invalid json_document image: the check failed
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, together with <a href=../../features/json_view/#images>images</a>.</p> </div> <h2 id=iterator-errors>Iterator errors<a class=headerlink href=#iterator-errors title="Permanent link">¶</a></h2> <p>This exception is thrown if iterators passed to a library function do not match the expected semantics.</p> <p>Exceptions have ids 2xx.</p> <details class=example> <summary>Example: catch an <code>invalid_iterator</code> exception</summary> <p>The following code shows how an <code>invalid_iterator</code> exception can be caught.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
<span class=p>{</span>
|
||||
@@ -157,7 +166,7 @@ byte position of error: 8
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>// output exception information</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"message: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>what</span><span class=p>()</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>endl</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code>message: [json.exception.invalid_iterator.207] cannot use key() for non-object iterators
|
||||
@@ -180,7 +189,7 @@ exception id: 207
|
||||
</code></pre></div> </div> <h2 id=type-errors>Type errors<a class=headerlink href=#type-errors title="Permanent link">¶</a></h2> <p>This exception is thrown in case of a type error; that is, a library function is executed on a <abbr title="JavaScript Object Notation">JSON</abbr> value whose type does not match the expected semantics.</p> <p>Exceptions have ids 3xx.</p> <details class=example> <summary>Example: catch a <code>type_error</code> exception</summary> <p>The following code shows how a <code>type_error</code> exception can be caught.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
<span class=p>{</span>
|
||||
@@ -194,7 +203,7 @@ exception id: 207
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>// output exception information</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"message: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>what</span><span class=p>()</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>endl</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code>message: [json.exception.type_error.308] cannot use push_back() with string
|
||||
@@ -220,18 +229,17 @@ exception id: 308
|
||||
</code></pre></div> </div> <h3 id=jsonexceptiontype_error313>json.exception.type_error.313<a class=headerlink href=#jsonexceptiontype_error313 title="Permanent link">¶</a></h3> <p>The <a href=../../api/basic_json/unflatten/ ><code>unflatten()</code></a> function converts an object whose keys are <abbr title="JavaScript Object Notation">JSON</abbr> Pointers back into an arbitrary nested <abbr title="JavaScript Object Notation">JSON</abbr> value. The <abbr title="JavaScript Object Notation">JSON</abbr> Pointers must not overlap, because then the resulting value would not be well-defined.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.type_error.313] invalid value to unflatten
|
||||
</code></pre></div> </div> <h3 id=jsonexceptiontype_error314>json.exception.type_error.314<a class=headerlink href=#jsonexceptiontype_error314 title="Permanent link">¶</a></h3> <p>The <a href=../../api/basic_json/unflatten/ ><code>unflatten()</code></a> function only works for an object whose keys are <abbr title="JavaScript Object Notation">JSON</abbr> Pointers.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Calling <code>unflatten()</code> on an array <code class=highlight><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>,</span><span class=mi>3</span><span class=p>]</span></code>:</p> <div class=highlight><pre><span></span><code>[json.exception.type_error.314] only objects can be unflattened
|
||||
</code></pre></div> </div> <h3 id=jsonexceptiontype_error315>json.exception.type_error.315<a class=headerlink href=#jsonexceptiontype_error315 title="Permanent link">¶</a></h3> <p>The <a href=../../api/basic_json/unflatten/ ><code>unflatten()</code></a> function only works for an object whose keys are <abbr title="JavaScript Object Notation">JSON</abbr> Pointers and whose values are primitive.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Calling <code>unflatten()</code> on an object <code class=highlight><span class=p>{</span><span class=s2>"/1"</span><span class=p>,</span><span class=w> </span><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>,</span><span class=mi>3</span><span class=p>]}</span></code>:</p> <div class=highlight><pre><span></span><code>[json.exception.type_error.315] values in object must be primitive
|
||||
</code></pre></div> </div> <h3 id=jsonexceptiontype_error316>json.exception.type_error.316<a class=headerlink href=#jsonexceptiontype_error316 title="Permanent link">¶</a></h3> <p>The <a href=../../api/basic_json/dump/ ><code>dump()</code></a> function only works with <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded strings; that is, if you assign a <code>std::string</code> to a <abbr title="JavaScript Object Notation">JSON</abbr> value, make sure it is <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded. See the <abbr title="Frequently Asked Questions">FAQ</abbr> entry on <a href=../faq/#serializing-untrusted-or-invalid-utf-8>serializing untrusted or invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8</a> for background and the recommended fix.</p> <p>The binary writers <a href=../../api/basic_json/to_cbor/ ><code>to_cbor()</code></a>, <a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson()</code></a>, <a href=../../api/basic_json/to_bjdata/ ><code>to_bjdata()</code></a>, and <a href=../../api/basic_json/to_bson/ ><code>to_bson()</code></a> throw this exception as well for a string value or object key that is not valid <abbr title="Unicode Transformation Format">UTF</abbr>-8 if their <code>error_handler</code> is <code>strict</code> (the default if <a href=../../api/macros/json_strict_binary_utf8/ ><code>JSON_STRICT_BINARY_UTF8</code></a> is enabled). So does <a href=../../api/basic_json/to_msgpack/ ><code>to_msgpack()</code></a> if <code>error_handler_t::strict</code> is passed.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Calling <code>dump()</code> on a <abbr title="JavaScript Object Notation">JSON</abbr> value containing an <abbr title="International Organization for Standardization">ISO</abbr> 8859-1 encoded string: <div class=highlight><pre><span></span><code>[json.exception.type_error.316] invalid UTF-8 byte at index 15: 0x6F
|
||||
</code></pre></div> </div> <h3 id=jsonexceptiontype_error316>json.exception.type_error.316<a class=headerlink href=#jsonexceptiontype_error316 title="Permanent link">¶</a></h3> <p>The <a href=../../api/basic_json/dump/ ><code>dump()</code></a> function only works with <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded strings; that is, if you assign a <code>std::string</code> to a <abbr title="JavaScript Object Notation">JSON</abbr> value, make sure it is <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded. See the <abbr title="Frequently Asked Questions">FAQ</abbr> entry on <a href=../faq/#serializing-untrusted-or-invalid-utf-8>serializing untrusted or invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8</a> for background and the recommended fix.</p> <p>The binary writers <a href=../../api/basic_json/to_cbor/ ><code>to_cbor()</code></a>, <a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson()</code></a>, <a href=../../api/basic_json/to_bjdata/ ><code>to_bjdata()</code></a>, and <a href=../../api/basic_json/to_bson/ ><code>to_bson()</code></a> throw this exception as well for a string value or object key that is not valid <abbr title="Unicode Transformation Format">UTF</abbr>-8 if their <code>error_handler</code> is <code>strict</code> (the default if <a href=../../api/macros/json_strict_binary_utf8/ ><code>JSON_STRICT_BINARY_UTF8</code></a> is enabled). So does <a href=../../api/basic_json/to_msgpack/ ><code>to_msgpack()</code></a> if <code>error_handler_t::strict</code> is passed. <a href=../../api/basic_json/to_bon8/ ><code>to_bon8()</code></a> always throws this exception for such a string or key, regardless of <a href=../../api/macros/json_strict_binary_utf8/ ><code>JSON_STRICT_BINARY_UTF8</code></a>, because the end of a <abbr title="Binary Object Notation 8">BON8</abbr> string is determined from its <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoding.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Calling <code>dump()</code> on a <abbr title="JavaScript Object Notation">JSON</abbr> value containing an <abbr title="International Organization for Standardization">ISO</abbr> 8859-1 encoded string: <div class=highlight><pre><span></span><code>[json.exception.type_error.316] invalid UTF-8 byte at index 15: 0x6F
|
||||
</code></pre></div></p> </div> <div class="admonition tip"> <p class=admonition-title>Tip</p> <ul> <li>Store the source file with <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoding.</li> <li>Pass an error handler as last parameter to the <code>dump()</code> function to avoid this exception:<ul> <li><code>json::error_handler_t::replace</code> will replace invalid bytes sequences with <code>U+FFFD</code> </li> <li><code>json::error_handler_t::ignore</code> will silently ignore invalid byte sequences</li> <li><code>json::error_handler_t::keep</code> will copy invalid byte sequences to the output unchanged</li> </ul> </li> </ul> </div> <h3 id=jsonexceptiontype_error317>json.exception.type_error.317<a class=headerlink href=#jsonexceptiontype_error317 title="Permanent link">¶</a></h3> <p>The dynamic type of the object cannot be represented in the requested serialization format (e.g., a raw <code>true</code> or <code>null</code> <abbr title="JavaScript Object Notation">JSON</abbr> object cannot be serialized to <abbr title="Binary JSON">BSON</abbr>)</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p>Serializing <code class=highlight><span class=kc>null</span></code> to <abbr title="Binary JSON">BSON</abbr>: <div class=highlight><pre><span></span><code>[json.exception.type_error.317] to serialize to BSON, top-level type must be object, but is null
|
||||
</code></pre></div> Serializing <code class=highlight><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>,</span><span class=mi>3</span><span class=p>]</span></code> to <abbr title="Binary JSON">BSON</abbr>: <div class=highlight><pre><span></span><code>[json.exception.type_error.317] to serialize to BSON, top-level type must be object, but is array
|
||||
</code></pre></div></p> </div> <div class="admonition tip"> <p class=admonition-title>Tip</p> <p>Encapsulate the <abbr title="JavaScript Object Notation">JSON</abbr> value in an object. That is, instead of serializing <code class=highlight><span class=kc>true</span></code>, serialize <code class=highlight><span class=p>{</span><span class=nt>"value"</span><span class=p>:</span><span class=w> </span><span class=kc>true</span><span class=p>}</span></code></p> </div> <h3 id=jsonexceptiontype_error318>json.exception.type_error.318<a class=headerlink href=#jsonexceptiontype_error318 title="Permanent link">¶</a></h3> <p>With <a href=../../api/macros/json_use_objects_for_enum_keyed_maps/ ><code>JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS</code></a>, a map with enum keys is stored as an object. This exception is thrown if two of its keys are converted to the same string, so one of the entries would be lost. This happens, for instance, if <a href=../../api/macros/nlohmann_json_serialize_enum/ ><code>NLOHMANN_JSON_SERIALIZE_ENUM</code></a> does not list an enumerator and it is therefore converted like the first listed one.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.type_error.318] duplicate object key 'red'
|
||||
</code></pre></div> </div> <h3 id=jsonexceptiontype_error319>json.exception.type_error.319<a class=headerlink href=#jsonexceptiontype_error319 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json_document/set/ ><code>basic_json_document::set</code></a>, <a href=../../api/basic_json_document/push_back/ ><code>basic_json_document::push_back</code></a>, and <a href=../../api/basic_json_document/insert/ ><code>basic_json_document::insert</code></a> can store any <code>basic_json</code> value except a binary one: a <code>json_document</code> has no representation for <a href=../../features/binary_values/ >binary values</a>, which only ever arise from parsing a binary format or from an explicit <a href=../../api/basic_json/binary/ ><code>json::binary</code></a> value, not from <abbr title="JavaScript Object Notation">JSON</abbr> text.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.type_error.319] cannot store a binary value in a json_document
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, together with editable <a href=../../features/json_view/ ><code>json_document</code>s</a>.</p> </div> <h3 id=jsonexceptiontype_error320>json.exception.type_error.320<a class=headerlink href=#jsonexceptiontype_error320 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json_document/save/ ><code>basic_json_document::save()</code></a> cannot write an <a href=../../features/json_view/#images>image</a> of a <a href=../../api/basic_json_document/is_discarded/ >discarded</a> document. <a href=../../api/basic_json_document/save/ ><code>save()</code></a> and <a href=../../api/basic_json_document/load/ ><code>load()</code></a> also throw this exception on a big-endian target, since the image format is little-endian only.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.type_error.320] cannot save a discarded json_document
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.type_error.320] json_document images need a little-endian target
|
||||
</code></pre></div></p> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, together with <a href=../../features/json_view/#images>images</a>.</p> </div> <h3 id=jsonexceptiontype_error321>json.exception.type_error.321<a class=headerlink href=#jsonexceptiontype_error321 title="Permanent link">¶</a></h3> <p>A discarded value (one created by <a href=../../api/basic_json/parse/ ><code>parse()</code></a> with a callback that returns <code>false</code> for the value, or by default-constructing a <a href=../../api/basic_json/ ><code>basic_json</code></a> with <a href=../../api/basic_json/value_t/ ><code>value_t::discarded</code></a>) was passed to a binary serialization function, either directly or nested in an array or object. There is no way to represent a discarded value in <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, <abbr title="Universal Binary JSON">UBJSON</abbr>, <abbr title="Binary JData">BJData</abbr>, <abbr title="Binary JSON">BSON</abbr>, or <abbr title="Binary Object Notation 8">BON8</abbr>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Serializing <code class=highlight><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>]</span></code> to <abbr title="Concise Binary Object Representation">CBOR</abbr>, where the second element was discarded by a parser callback: <div class=highlight><pre><span></span><code>[json.exception.type_error.321] cannot serialize discarded value to CBOR
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, together with editable <a href=../../features/json_view/ ><code>json_document</code>s</a>.</p> </div> <h3 id=jsonexceptiontype_error320>json.exception.type_error.320<a class=headerlink href=#jsonexceptiontype_error320 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json_document/save/ ><code>basic_json_document::save()</code></a> cannot write an <a href=../../features/json_view/#images>image</a> of a <a href=../../api/basic_json_document/is_discarded/ >discarded</a> document.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <div class=highlight><pre><span></span><code>[json.exception.type_error.320] cannot save a discarded json_document
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, together with <a href=../../features/json_view/#images>images</a>.</p> </div> <h3 id=jsonexceptiontype_error321>json.exception.type_error.321<a class=headerlink href=#jsonexceptiontype_error321 title="Permanent link">¶</a></h3> <p>A discarded value (one created by <a href=../../api/basic_json/parse/ ><code>parse()</code></a> with a callback that returns <code>false</code> for the value, or by default-constructing a <a href=../../api/basic_json/ ><code>basic_json</code></a> with <a href=../../api/basic_json/value_t/ ><code>value_t::discarded</code></a>) was passed to a binary serialization function, either directly or nested in an array or object. There is no way to represent a discarded value in <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, <abbr title="Universal Binary JSON">UBJSON</abbr>, <abbr title="Binary JData">BJData</abbr>, <abbr title="Binary JSON">BSON</abbr>, or <abbr title="Binary Object Notation 8">BON8</abbr>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Serializing <code class=highlight><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>]</span></code> to <abbr title="Concise Binary Object Representation">CBOR</abbr>, where the second element was discarded by a parser callback: <div class=highlight><pre><span></span><code>[json.exception.type_error.321] cannot serialize discarded value to CBOR
|
||||
</code></pre></div></p> </div> <h2 id=out-of-range>Out of range<a class=headerlink href=#out-of-range title="Permanent link">¶</a></h2> <p>This exception is thrown in case a library function is called on an input parameter that exceeds the expected range, for instance, in the case of array indices or nonexisting object keys.</p> <p>Exceptions have ids 4xx.</p> <details class=example> <summary>Example: catch an <code>out_of_range</code> exception</summary> <p>The following code shows how an <code>out_of_range</code> exception can be caught.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
<span class=p>{</span>
|
||||
@@ -245,7 +253,7 @@ exception id: 308
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>// output exception information</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"message: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>what</span><span class=p>()</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>endl</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code>message: [json.exception.out_of_range.401] array index 4 is out of range
|
||||
@@ -257,28 +265,29 @@ exception id: 401
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range405>json.exception.out_of_range.405<a class=headerlink href=#jsonexceptionout_of_range405 title="Permanent link">¶</a></h3> <p>The <abbr title="JavaScript Object Notation">JSON</abbr> Patch operations 'remove' and 'move' cannot be applied to the root element of the <abbr title="JavaScript Object Notation">JSON</abbr> value. The exception is also thrown when the parent or a reference token of an empty <abbr title="JavaScript Object Notation">JSON</abbr> Pointer is requested, for instance by <a href=../../api/json_pointer/back/ ><code>back</code></a> or <a href=../../api/json_pointer/pop_back/ ><code>pop_back</code></a>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>JSON pointer has no parent
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range406>json.exception.out_of_range.406<a class=headerlink href=#jsonexceptionout_of_range406 title="Permanent link">¶</a></h3> <p>A parsed number could not be stored without changing it to <abbr title="Not a Number">NaN</abbr> or INF. For the binary formats, this happens when a finite floating-point number does not fit into <a href=../../api/basic_json/number_float_t/ ><code>number_float_t</code></a>, for example a double-precision number when <code>number_float_t</code> is <code class=highlight><span class=kt>float</span></code>.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>number overflow parsing '10E1000'
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.406] syntax error while parsing CBOR value: number overflow
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range407>json.exception.out_of_range.407<a class=headerlink href=#jsonexceptionout_of_range407 title="Permanent link">¶</a></h3> <p>An integer number cannot be represented by the binary format it is serialized to:</p> <ul> <li><a href=../../features/binary_formats/bon8/ ><abbr title="Binary Object Notation 8">BON8</abbr></a> only stores integers that fit into int64, so <a href=../../api/basic_json/to_bon8/ ><code>to_bon8</code></a> throws for unsigned integers greater than 9223372036854775807.</li> <li><a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a>, <a href=../../features/binary_formats/messagepack/ >MessagePack</a>, and <a href=../../features/binary_formats/bson/ ><abbr title="Binary JSON">BSON</abbr></a> store integers in at most 64 bits. With the default number types, every integer fits, but a <a href=../../api/basic_json/number_integer_t/ ><code>number_integer_t</code></a> or <a href=../../api/basic_json/number_unsigned_t/ ><code>number_unsigned_t</code></a> wider than 64 bits (e.g., <code>__int128</code>) can hold values outside the range of the format: [-2^64, 2^64-1] for <abbr title="Concise Binary Object Representation">CBOR</abbr>, [-2^63, 2^64-1] for MessagePack, and the range of int64 (signed integers) or uint64 (unsigned integers) for <abbr title="Binary JSON">BSON</abbr>.</li> </ul> <p><a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a> and <a href=../../features/binary_formats/bjdata/ ><abbr title="Binary JData">BJData</abbr></a> never throw this exception, because they serialize integers beyond 64 bits as high-precision numbers.</p> <div class="admonition note"> <p class=admonition-title>Former occurrences</p> <p>The <abbr title="Universal Binary JSON">UBJSON</abbr> and <abbr title="Binary JSON">BSON</abbr> writers used to throw this exception as well:</p> <ul> <li>Since version 3.9.0, integer numbers beyond int64 are serialized as high-precision <abbr title="Universal Binary JSON">UBJSON</abbr> numbers.</li> <li>Since version 3.12.0, integer numbers beyond int64 are serialized as uint64 <abbr title="Binary JSON">BSON</abbr> numbers.</li> </ul> <p>Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, and <abbr title="Binary JSON">BSON</abbr> silently truncated integers wider than 64 bits, and <abbr title="Binary JData">BJData</abbr> truncated unsigned integers wider than 64 bits.</p> </div> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>integer number 18446744073709551615 cannot be represented by BON8 as it does not fit int64
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range407>json.exception.out_of_range.407<a class=headerlink href=#jsonexceptionout_of_range407 title="Permanent link">¶</a></h3> <p>An integer number cannot be represented by the binary format it is serialized to:</p> <ul> <li><a href=../../features/binary_formats/bon8/ ><abbr title="Binary Object Notation 8">BON8</abbr></a> only stores integers that fit into int64, so <a href=../../api/basic_json/to_bon8/ ><code>to_bon8</code></a> throws for unsigned integers greater than 9223372036854775807 and, with a number type wider than 64 bits, for any integer outside the int64 range.</li> <li><a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a>, <a href=../../features/binary_formats/messagepack/ >MessagePack</a>, and <a href=../../features/binary_formats/bson/ ><abbr title="Binary JSON">BSON</abbr></a> store integers in at most 64 bits. With the default number types, every integer fits, but a <a href=../../api/basic_json/number_integer_t/ ><code>number_integer_t</code></a> or <a href=../../api/basic_json/number_unsigned_t/ ><code>number_unsigned_t</code></a> wider than 64 bits (e.g., <code>__int128</code>) can hold values outside the range of the format: [-2^64, 2^64-1] for <abbr title="Concise Binary Object Representation">CBOR</abbr>, [-2^63, 2^64-1] for MessagePack, and the range of int64 (signed integers) or uint64 (unsigned integers) for <abbr title="Binary JSON">BSON</abbr>.</li> </ul> <p><a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a> and <a href=../../features/binary_formats/bjdata/ ><abbr title="Binary JData">BJData</abbr></a> never throw this exception, because they serialize integers beyond 64 bits as high-precision numbers.</p> <div class="admonition note"> <p class=admonition-title>Former occurrences</p> <p>The <abbr title="Universal Binary JSON">UBJSON</abbr> and <abbr title="Binary JSON">BSON</abbr> writers used to throw this exception as well:</p> <ul> <li>Since version 3.9.0, integer numbers beyond int64 are serialized as high-precision <abbr title="Universal Binary JSON">UBJSON</abbr> numbers.</li> <li>Since version 3.12.0, integer numbers beyond int64 are serialized as uint64 <abbr title="Binary JSON">BSON</abbr> numbers.</li> </ul> <p>Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, <abbr title="Concise Binary Object Representation">CBOR</abbr>, MessagePack, and <abbr title="Binary JSON">BSON</abbr> silently truncated integers wider than 64 bits, and <abbr title="Binary JData">BJData</abbr> truncated unsigned integers wider than 64 bits that were elements of ND-arrays with <code>"_ArrayType_": "uint64"</code>.</p> </div> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>integer number 18446744073709551615 cannot be represented by BON8 as it does not fit int64
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>integer number 1267650600228229401496703205376 cannot be represented by CBOR as it does not fit [-2^64, 2^64-1]
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range408>json.exception.out_of_range.408<a class=headerlink href=#jsonexceptionout_of_range408 title="Permanent link">¶</a></h3> <p>The size of an array or object in a <a href=../../features/binary_formats/ >binary format</a> exceeds the maximal capacity: the size following <code>#</code> for <a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a>/<a href=../../features/binary_formats/bjdata/ ><abbr title="Binary JData">BJData</abbr></a>, or the encoded length for <a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a>.</p> <p>The exception is also thrown for a <a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a> array of a type that is encoded by its marker alone (<code>Z</code>, <code>T</code> or <code>F</code>) whose declared count exceeds 1,048,576 (<code>1 << 20</code>). Such an array has no payload, so its count alone decides how much memory is allocated, and a handful of bytes would otherwise describe billions of values. <a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson</code></a> writes longer arrays of these types without the size and type annotation, so any value it produces can still be read back.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>excessive array size: 8658170730974374167
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range408>json.exception.out_of_range.408<a class=headerlink href=#jsonexceptionout_of_range408 title="Permanent link">¶</a></h3> <p>The size of an array or object in a <a href=../../features/binary_formats/ >binary format</a> exceeds the maximal capacity: the size following <code>#</code> for <a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a>/<a href=../../features/binary_formats/bjdata/ ><abbr title="Binary JData">BJData</abbr></a>, or the encoded length for <a href=../../features/binary_formats/cbor/ ><abbr title="Concise Binary Object Representation">CBOR</abbr></a>.</p> <p>The exception is also thrown for a <a href=../../features/binary_formats/ubjson/ ><abbr title="Universal Binary JSON">UBJSON</abbr></a> array of a type that is encoded by its marker alone (<code>Z</code>, <code>T</code> or <code>F</code>) whose declared count exceeds 1,048,576 (<code>1 << 20</code>). Such an array has no payload, so its count alone decides how much memory is allocated, and a handful of bytes would otherwise describe billions of values. <a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson</code></a> writes longer arrays of these types without the <code>$</code> type annotation (the <code>#</code> count and one marker per element are kept), so any value it produces can still be read back.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>excessive array size: 8658170730974374167
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.408] syntax error while parsing CBOR size: excessive array size
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.408] syntax error while parsing CBOR size: excessive map size
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.408] syntax error while parsing UBJSON size: excessive array size
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionout_of_range409>json.exception.out_of_range.409<a class=headerlink href=#jsonexceptionout_of_range409 title="Permanent link">¶</a></h3> <p>Key identifiers to be serialized to <abbr title="Binary JSON">BSON</abbr> cannot contain code point U+0000, since the key is stored as zero-terminated c-string.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>BSON key cannot contain code point U+0000 (at byte 2)
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range410>json.exception.out_of_range.410<a class=headerlink href=#jsonexceptionout_of_range410 title="Permanent link">¶</a></h3> <p>This exception is thrown when an undefined value is used with <a href=../../api/macros/nlohmann_json_serialize_enum_strict/ ><code>NLOHMANN_JSON_SERIALIZE_ENUM_STRICT</code></a>, or when an array index in a <abbr title="JavaScript Object Notation">JSON</abbr> pointer exceeds the range of <code>size_type</code> (e.g., on 32-bit platforms).</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>enum value out of range
|
||||
array index 18446744073709551616 exceeds size_type
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range411>json.exception.out_of_range.411<a class=headerlink href=#jsonexceptionout_of_range411 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>add</code> operation cannot be applied because the target location's parent is neither an object nor an array. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a>, an <code>add</code> target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) cannot receive a new member or element.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation hit an internal assertion (aborting the program in debug builds) or was silently ignored when assertions were disabled.</p> </div> <h3 id=jsonexceptionout_of_range412>json.exception.out_of_range.412<a class=headerlink href=#jsonexceptionout_of_range412 title="Permanent link">¶</a></h3> <p><abbr title="Binary JSON">BSON</abbr> stores the length of documents, arrays, strings, and binary values in a signed 32-bit integer, and MessagePack stores the length of strings, binary values, arrays, and objects in at most an unsigned 32-bit integer. This exception is thrown when a value is too large to be described by such a length field.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>BSON length 2147483661 exceeds maximum of 2147483647
|
||||
array index 18446744073709551615 exceeds size_type
|
||||
</code></pre></div> <p>The second message is thrown, for instance, by <code class=highlight><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=s>"[1, 2]"</span><span class=p>).</span><span class=n>at</span><span class=p>(</span><span class=s>"/18446744073709551615"</span><span class=n>_json_pointer</span><span class=p>)</span></code> on a 64-bit platform, where <code>size_type</code> is <code class=highlight><span class=n>std</span><span class=o>::</span><span class=kt>size_t</span></code> and this index is <code>SIZE_MAX</code>. An index that does not fit into 64 bits (such as <code>18446744073709551616</code>) is not reported as 410 but as <a href=#jsonexceptionout_of_range404><code>out_of_range.404</code></a>.</p> </div> <h3 id=jsonexceptionout_of_range411>json.exception.out_of_range.411<a class=headerlink href=#jsonexceptionout_of_range411 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>add</code> operation cannot be applied because the target location's parent is neither an object nor an array. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a>, an <code>add</code> target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) cannot receive a new member or element.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation hit an internal assertion (aborting the program in debug builds) or was silently ignored when assertions were disabled.</p> <p>A <code>null</code> parent is rejected as well. Before version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, an <code>add</code> into a <code>null</code> parent silently converted it to an object (e.g., <code>add</code> at <code>/foo/bar</code> turned <code>{"foo":null}</code> into <code>{"foo":{"bar":1}}</code>).</p> </div> <h3 id=jsonexceptionout_of_range412>json.exception.out_of_range.412<a class=headerlink href=#jsonexceptionout_of_range412 title="Permanent link">¶</a></h3> <p><abbr title="Binary JSON">BSON</abbr> stores the length of documents, arrays, strings, and binary values in a signed 32-bit integer, and MessagePack stores the length of strings, binary values, arrays, and objects in at most an unsigned 32-bit integer. This exception is thrown when a value is too large to be described by such a length field.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>BSON length 2147483661 exceeds maximum of 2147483647
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>MessagePack length 4294967296 exceeds maximum of 4294967295
|
||||
</code></pre></div></p> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, the <abbr title="Binary JSON">BSON</abbr> length was silently truncated, and <a href=../../api/basic_json/to_bson/ ><code>to_bson</code></a> produced documents with negative length prefixes that <a href=../../api/basic_json/from_bson/ ><code>from_bson</code></a> rejected; <a href=../../api/basic_json/to_msgpack/ ><code>to_msgpack</code></a> wrote such a value without any length, producing output that could not be read back.</p> </div> <h3 id=jsonexceptionout_of_range413>json.exception.out_of_range.413<a class=headerlink href=#jsonexceptionout_of_range413 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>remove</code> operation cannot be applied because the target location's parent is neither an object nor an array. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a>, a <code>remove</code> target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) or <code>null</code> has no members or elements to remove.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>cannot remove value: the JSON Patch 'remove' target's parent is of type number, but must be an object or array
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation was silently ignored (the <code>remove</code> operation had no effect).</p> </div> <h3 id=jsonexceptionout_of_range414>json.exception.out_of_range.414<a class=headerlink href=#jsonexceptionout_of_range414 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch <code>move</code> operation's <code>"from"</code> location is a proper prefix of its <code>"path"</code> location. Per <a href="https://datatracker.ietf.org/doc/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902</a> (section 4.4), a location cannot be moved into one of its own children.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>cannot move value: 'from' path '/0' is a proper prefix of 'path' '/0/0'
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation could succeed with a corrupted result: for an array target, removing the "from" element before the "add" step shifted subsequent indices, so "path" silently re-resolved to a different element than intended.</p> </div> <h3 id=jsonexceptionout_of_range415>json.exception.out_of_range.415<a class=headerlink href=#jsonexceptionout_of_range415 title="Permanent link">¶</a></h3> <p>MessagePack's ext type and <abbr title="Binary JSON">BSON</abbr>'s binary subtype are each stored in a single byte. This exception is thrown when serializing a <a href=../../api/byte_container_with_subtype/ ><code>byte_container_with_subtype</code></a> whose subtype exceeds 255.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.415] subtype 70000 is too large for the MessagePack ext type (max 255)
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, subtypes above 255 were silently truncated modulo 256 instead of raising an error.</p> </div> <h3 id=jsonexceptionout_of_range416>json.exception.out_of_range.416<a class=headerlink href=#jsonexceptionout_of_range416 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json_document/parse/ ><code>basic_json_document::parse()</code></a> and the other parsing functions of <a href=../../api/basic_json_document/ ><code>basic_json_document</code></a> index a value's position in the source text in 32 bits, so they do not support an input of 4294967280 bytes (4 GiB minus 16 bytes) or more. The same 32-bit limit applies to an <strong>editable</strong> document's own storage: <a href=../../api/basic_json_document/set/ ><code>set</code></a> and <a href=../../api/basic_json_document/push_back/ ><code>push_back</code></a> throw this exception once the strings and number tokens written by edits reach 4 GiB in total, or once more than 4294967295 arrays/objects have had an element set or appended to them. The same limit applies to an <a href=../../features/json_view/#images>image</a>: <a href=../../api/basic_json_document/save/ ><code>save()</code></a> throws it if the node count, the text, or the decoded strings it would write would individually reach 4 GiB.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.out_of_range.416] input of 4294967280 bytes or more is not supported by json_document
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, this situation could succeed with a corrupted result: for an array target, removing the "from" element before the "add" step shifted subsequent indices, so "path" silently re-resolved to a different element than intended.</p> </div> <h3 id=jsonexceptionout_of_range415>json.exception.out_of_range.415<a class=headerlink href=#jsonexceptionout_of_range415 title="Permanent link">¶</a></h3> <p>MessagePack's ext type and <abbr title="Binary JSON">BSON</abbr>'s binary subtype are each stored in a single byte. This exception is thrown when serializing a <a href=../../api/byte_container_with_subtype/ ><code>byte_container_with_subtype</code></a> whose subtype exceeds 255, the largest value the library can store in that byte.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.415] subtype 70000 is too large for the MessagePack ext type (max 255)
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.415] subtype 70000 is too large for the BSON binary subtype (max 255)
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, subtypes above 255 were silently truncated modulo 256 instead of raising an error.</p> </div> <h3 id=jsonexceptionout_of_range416>json.exception.out_of_range.416<a class=headerlink href=#jsonexceptionout_of_range416 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json_document/parse/ ><code>basic_json_document::parse()</code></a> and the other parsing functions of <a href=../../api/basic_json_document/ ><code>basic_json_document</code></a> index a value's position in the source text in 32 bits, so they do not support an input of 4294967280 bytes (4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> minus 16 bytes) or more. The same 32-bit limit applies to an <strong>editable</strong> document's own storage: <a href=../../api/basic_json_document/set/ ><code>set</code></a> and <a href=../../api/basic_json_document/push_back/ ><code>push_back</code></a> throw this exception once the strings and number tokens written by edits reach 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr> in total, or once more than 4294967295 arrays/objects have had an element set or appended to them. The same limit applies to an <a href=../../features/json_view/#images>image</a>: <a href=../../api/basic_json_document/save/ ><code>save()</code></a> throws it if the node count, the text, or the decoded strings it would write would individually reach 4 <abbr title="Gibibyte (2^30 bytes)">GiB</abbr>.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.out_of_range.416] input of 4294967280 bytes or more is not supported by json_document
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.416] edits of 4 GiB or more are not supported by json_document
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.out_of_range.416] images of 4 GiB or more are not supported by json_document
|
||||
</code></pre></div></p> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, together with <a href=../../features/json_view/ ><code><nlohmann/json_view.hpp></code></a>. <a href=../../api/basic_json/parse/ ><code>basic_json::parse()</code></a> has no such limit.</p> </div> <h2 id=further-exceptions>Further exceptions<a class=headerlink href=#further-exceptions title="Permanent link">¶</a></h2> <p>This exception is thrown in case of errors that cannot be classified with the other exception types.</p> <p>Exceptions have ids 5xx.</p> <details class=example> <summary>Example: catch an <code>other_error</code> exception</summary> <p>The following code shows how an <code>other_error</code> exception can be caught.</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
|
||||
<span class=k>using</span><span class=w> </span><span class=k>namespace</span><span class=w> </span><span class=nn>nlohmann</span><span class=o>::</span><span class=nn>literals</span><span class=p>;</span>
|
||||
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
@@ -302,11 +311,11 @@ array index 18446744073709551616 exceeds size_type
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>// output exception information</span>
|
||||
<span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"message: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>what</span><span class=p>()</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>endl</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code>message: [json.exception.other_error.501] unsuccessful: {"op":"test","path":"/best_biscuit/name","value":"Choco Leibniz"}
|
||||
exception id: 501
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionother_error501>json.exception.other_error.501<a class=headerlink href=#jsonexceptionother_error501 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Patch operation 'test' failed. The unsuccessful operation is also printed.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Executing <code class=highlight><span class=p>{</span><span class=nt>"op"</span><span class=p>:</span><span class=s2>"test"</span><span class=p>,</span><span class=w> </span><span class=nt>"path"</span><span class=p>:</span><span class=s2>"/baz"</span><span class=p>,</span><span class=w> </span><span class=nt>"value"</span><span class=p>:</span><span class=s2>"bar"</span><span class=p>}</span></code> on <code class=highlight><span class=p>{</span><span class=nt>"baz"</span><span class=p>:</span><span class=w> </span><span class=s2>"qux"</span><span class=p>}</span></code>:</p> <div class=highlight><pre><span></span><code>[json.exception.other_error.501] unsuccessful: {"op":"test","path":"/baz","value":"bar"}
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionother_error502>json.exception.other_error.502<a class=headerlink href=#jsonexceptionother_error502 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson</code></a> and <a href=../../api/basic_json/to_bjdata/ ><code>to_bjdata</code></a> were called with <code>use_type = true</code> but <code>use_size = false</code>. <abbr title="Universal Binary JSON">UBJSON</abbr> requires a size marker (<code>#</code>) after a type marker (<code>$</code>).</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.other_error.502] use_type requires use_size = true
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, debug builds aborted on an assertion and release builds wrote a <code>$</code> marker without <code>#</code>, which <a href=../../api/basic_json/from_ubjson/ ><code>from_ubjson</code></a> then rejected.</p> </div> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 25, 2026 05:18:07 UTC">October 25, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" target="_blank" rel="noopener" title="www.xing.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 384 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.Line truncated
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionother_error502>json.exception.other_error.502<a class=headerlink href=#jsonexceptionother_error502 title="Permanent link">¶</a></h3> <p><a href=../../api/basic_json/to_ubjson/ ><code>to_ubjson</code></a> and <a href=../../api/basic_json/to_bjdata/ ><code>to_bjdata</code></a> were called with <code>use_type = true</code> but <code>use_size = false</code>, and the value contains a non-empty array or object (or, with <abbr title="Binary JData">BJData</abbr> Draft 3, any binary value). <abbr title="Universal Binary JSON">UBJSON</abbr> requires a size marker (<code>#</code>) after a type marker (<code>$</code>); scalars and empty arrays or objects do not throw.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.other_error.502] use_type requires use_size = true
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. Before that, debug builds aborted on an assertion and release builds wrote a <code>$</code> marker without <code>#</code>, which <a href=../../api/basic_json/from_ubjson/ ><code>from_ubjson</code></a> then rejected.</p> </div> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 26, 2026 19:13:30 UTC">October 26, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" target="_blank" rel="noopener" title="www.xing.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 384 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.Line truncated
|
||||
+64
-30
@@ -39,6 +39,8 @@ classDiagram
|
||||
|
||||
Exceptions are used widely within the library. They can, however, be switched off with either using the compiler flag `-fno-exceptions` or by defining the symbol [`JSON_NOEXCEPTION`](https://json.nlohmann.me/api/macros/json_noexception/index.md). In this case, exceptions are replaced by `abort()` calls. You can further control this behavior by defining `JSON_THROW_USER` (overriding `throw`), `JSON_TRY_USER` (overriding `try`), and `JSON_CATCH_USER` (overriding `catch`).
|
||||
|
||||
See [Working without exceptions](https://json.nlohmann.me/features/no_exceptions/index.md) for the functions that report errors without throwing.
|
||||
|
||||
Note that [`JSON_THROW_USER`](https://json.nlohmann.me/api/macros/json_throw_user/index.md) should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.
|
||||
|
||||
Example: switch off exceptions and log errors before aborting
|
||||
@@ -73,7 +75,7 @@ Example: standard diagnostic message
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -112,7 +114,7 @@ Example: extended diagnostic message with `JSON_DIAGNOSTICS`
|
||||
# define JSON_DIAGNOSTICS 1
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -161,7 +163,7 @@ The following code shows how a `parse_error` exception can be caught.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -175,7 +177,7 @@ int main()
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << '\n'
|
||||
<< "byte position of error: " << e.byte << std::endl;
|
||||
<< "byte position of error: " << e.byte << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
@@ -247,6 +249,26 @@ Tip
|
||||
- Make sure the input is correctly read. Try to write the input to standard output to check if, for instance, the input file was successfully opened.
|
||||
- Paste the input to a JSON validator like <https://jsonlint.com> or a tool like [jq](https://jqlang.github.io/jq/).
|
||||
|
||||
Parsing a file fails at line 1, column 1 (unexpected end of input)
|
||||
|
||||
The messages `attempting to parse an empty input` (since version 3.11.3) and `unexpected end of input` (also the message of earlier versions for an empty input) at the very start of the input mean that the parser did not see a single character. The library only reads from the stream it is given: it does not open files and cannot tell a missing file from an empty one. The usual causes are:
|
||||
|
||||
- **The file was not opened.** A relative path is resolved against the *working directory of the running program*, not against the source file or the project. IDEs and build tools often start the program in a build directory (for example `build/` or `cmake-build-debug/`), so `"example.json"` may need to be `"../example.json"`. Use an absolute path to rule this out.
|
||||
- **The file is empty**, or a previous run truncated it (for example when it was opened for writing).
|
||||
- **The stream was already read.** A stream whose content has been consumed (by printing it with `std::cout << file.rdbuf()`, or by an earlier `accept`/`parse`/`>>`) is at its end. Parse it once, or rewind it with `seekg(0)` after clearing the state with `clear()`.
|
||||
|
||||
Check the stream before parsing it:
|
||||
|
||||
```
|
||||
std::ifstream f("example.json");
|
||||
if (!f.is_open())
|
||||
{
|
||||
std::cerr << "cannot open example.json\n";
|
||||
return 1;
|
||||
}
|
||||
json data = json::parse(f);
|
||||
```
|
||||
|
||||
### json.exception.parse_error.102
|
||||
|
||||
JSON uses the `\uxxxx` format to describe Unicode characters. Code points above 0xFFFF are split into two `\uxxxx` entries ("surrogate pairs"). This error indicates that the surrogate pair is incomplete or contains an invalid code point.
|
||||
@@ -353,7 +375,7 @@ Before version 3.13.0 unreleased, a one-character array index that is not a digi
|
||||
|
||||
### json.exception.parse_error.110
|
||||
|
||||
When parsing a [binary format](https://json.nlohmann.me/features/binary_formats/index.md), the byte vector ends before the complete value has been read.
|
||||
When parsing a [binary format](https://json.nlohmann.me/features/binary_formats/index.md), the byte vector ends before the complete value has been read, or (with `strict = true`) further bytes follow the value.
|
||||
|
||||
Example messages
|
||||
|
||||
@@ -371,7 +393,7 @@ Example messages
|
||||
|
||||
### json.exception.parse_error.112
|
||||
|
||||
An unexpected byte was read in a [binary format](https://json.nlohmann.me/features/binary_formats/index.md) or length information is invalid ([BSON](https://json.nlohmann.me/features/binary_formats/bson/index.md)).
|
||||
An unexpected byte was read in a [binary format](https://json.nlohmann.me/features/binary_formats/index.md) or length information is invalid ([BSON](https://json.nlohmann.me/features/binary_formats/bson/index.md)). In [BON8](https://json.nlohmann.me/features/binary_formats/bon8/index.md), this exception is also thrown for a key that is not a string and for ill-formed UTF-8.
|
||||
|
||||
Example messages
|
||||
|
||||
@@ -403,9 +425,13 @@ Example messages
|
||||
[json.exception.parse_error.112] parse error at byte 5: syntax error while parsing BSON document: document size 6 does not match the number of bytes read (5)
|
||||
```
|
||||
|
||||
```
|
||||
[json.exception.parse_error.112] parse error at byte 2: syntax error while parsing BON8 string: invalid UTF-8 byte: 0x80
|
||||
```
|
||||
|
||||
### json.exception.parse_error.113
|
||||
|
||||
A string could not be read from a [binary format](https://json.nlohmann.me/features/binary_formats/index.md): either a value that is not a string was read where one was required (for instance as a map key), the string's length specification is invalid, or the string's bytes are not valid UTF-8 and the `error_handler` parameter of the corresponding `from_*` function is set to `strict`. By default (`error_handler_t::keep`), the bytes of a string are not checked for valid UTF-8 on read; see the ill-formed UTF-8 notes on the individual [binary format](https://json.nlohmann.me/features/binary_formats/index.md) pages for how such a string is handled depending on `error_handler`.
|
||||
A string could not be read from a [binary format](https://json.nlohmann.me/features/binary_formats/index.md): either a value that is not a string was read where one was required (for instance as a map key), the string's length specification is invalid, or the string's bytes are not valid UTF-8 and the `error_handler` parameter of the corresponding `from_*` function is set to `strict`. By default (`error_handler_t::keep`), the bytes of a string are not checked for valid UTF-8 on read. This applies to the `from_*` functions that have an `error_handler` parameter; `from_bon8` does not have one. See the ill-formed UTF-8 notes on the individual [binary format](https://json.nlohmann.me/features/binary_formats/index.md) pages for how such a string is handled depending on `error_handler`. [`from_bon8()`](https://json.nlohmann.me/api/basic_json/from_bon8/index.md) never throws this exception: BON8 non-string keys and ill-formed UTF-8 are reported as [parse_error.112](#jsonexceptionparse_error112).
|
||||
|
||||
CBOR and MessagePack allow map keys of any type, but JSON object keys are always strings. Maps with keys of any other type (for instance integers or `null`) are therefore not supported; see the notes on [CBOR](https://json.nlohmann.me/features/binary_formats/cbor/index.md) and [MessagePack](https://json.nlohmann.me/features/binary_formats/messagepack/index.md).
|
||||
|
||||
@@ -447,14 +473,18 @@ Example message
|
||||
|
||||
### json.exception.parse_error.115
|
||||
|
||||
A UBJSON high-precision number could not be parsed.
|
||||
A UBJSON or BJData high-precision number could not be parsed.
|
||||
|
||||
Example message
|
||||
Example messages
|
||||
|
||||
```
|
||||
[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing UBJSON high-precision number: invalid number text: 1A
|
||||
```
|
||||
|
||||
```
|
||||
[json.exception.parse_error.115] parse error at byte 5: syntax error while parsing BJData high-precision number: invalid number text: 1A
|
||||
```
|
||||
|
||||
### json.exception.parse_error.116
|
||||
|
||||
[`basic_json_document::load()`](https://json.nlohmann.me/api/basic_json_document/load/index.md) rejected an [image](https://json.nlohmann.me/features/json_view/#images): either the bytes are not one [`save()`](https://json.nlohmann.me/api/basic_json_document/save/index.md) could have written (too short, an unknown magic number or format version, or sizes that do not fit the buffer), or they are, but fail the requested [`image_check`](https://json.nlohmann.me/api/basic_json_document/load/#image_check).
|
||||
@@ -483,7 +513,7 @@ The following code shows how an `invalid_iterator` exception can be caught.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -498,7 +528,7 @@ int main()
|
||||
{
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << std::endl;
|
||||
<< "exception id: " << e.id << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
@@ -668,7 +698,7 @@ The following code shows how a `type_error` exception can be caught.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -682,7 +712,7 @@ int main()
|
||||
{
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << std::endl;
|
||||
<< "exception id: " << e.id << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
@@ -878,7 +908,7 @@ Calling `unflatten()` on an object `{"/1", [1,2,3]}`:
|
||||
|
||||
The [`dump()`](https://json.nlohmann.me/api/basic_json/dump/index.md) function only works with UTF-8 encoded strings; that is, if you assign a `std::string` to a JSON value, make sure it is UTF-8 encoded. See the FAQ entry on [serializing untrusted or invalid UTF-8](https://json.nlohmann.me/home/faq/#serializing-untrusted-or-invalid-utf-8) for background and the recommended fix.
|
||||
|
||||
The binary writers [`to_cbor()`](https://json.nlohmann.me/api/basic_json/to_cbor/index.md), [`to_ubjson()`](https://json.nlohmann.me/api/basic_json/to_ubjson/index.md), [`to_bjdata()`](https://json.nlohmann.me/api/basic_json/to_bjdata/index.md), and [`to_bson()`](https://json.nlohmann.me/api/basic_json/to_bson/index.md) throw this exception as well for a string value or object key that is not valid UTF-8 if their `error_handler` is `strict` (the default if [`JSON_STRICT_BINARY_UTF8`](https://json.nlohmann.me/api/macros/json_strict_binary_utf8/index.md) is enabled). So does [`to_msgpack()`](https://json.nlohmann.me/api/basic_json/to_msgpack/index.md) if `error_handler_t::strict` is passed.
|
||||
The binary writers [`to_cbor()`](https://json.nlohmann.me/api/basic_json/to_cbor/index.md), [`to_ubjson()`](https://json.nlohmann.me/api/basic_json/to_ubjson/index.md), [`to_bjdata()`](https://json.nlohmann.me/api/basic_json/to_bjdata/index.md), and [`to_bson()`](https://json.nlohmann.me/api/basic_json/to_bson/index.md) throw this exception as well for a string value or object key that is not valid UTF-8 if their `error_handler` is `strict` (the default if [`JSON_STRICT_BINARY_UTF8`](https://json.nlohmann.me/api/macros/json_strict_binary_utf8/index.md) is enabled). So does [`to_msgpack()`](https://json.nlohmann.me/api/basic_json/to_msgpack/index.md) if `error_handler_t::strict` is passed. [`to_bon8()`](https://json.nlohmann.me/api/basic_json/to_bon8/index.md) always throws this exception for such a string or key, regardless of [`JSON_STRICT_BINARY_UTF8`](https://json.nlohmann.me/api/macros/json_strict_binary_utf8/index.md), because the end of a BON8 string is determined from its UTF-8 encoding.
|
||||
|
||||
Example message
|
||||
|
||||
@@ -944,7 +974,7 @@ This exception was added in version 3.13.0 unreleased, together with editable [`
|
||||
|
||||
### json.exception.type_error.320
|
||||
|
||||
[`basic_json_document::save()`](https://json.nlohmann.me/api/basic_json_document/save/index.md) cannot write an [image](https://json.nlohmann.me/features/json_view/#images) of a [discarded](https://json.nlohmann.me/api/basic_json_document/is_discarded/index.md) document. [`save()`](https://json.nlohmann.me/api/basic_json_document/save/index.md) and [`load()`](https://json.nlohmann.me/api/basic_json_document/load/index.md) also throw this exception on a big-endian target, since the image format is little-endian only.
|
||||
[`basic_json_document::save()`](https://json.nlohmann.me/api/basic_json_document/save/index.md) cannot write an [image](https://json.nlohmann.me/features/json_view/#images) of a [discarded](https://json.nlohmann.me/api/basic_json_document/is_discarded/index.md) document.
|
||||
|
||||
Example messages
|
||||
|
||||
@@ -952,10 +982,6 @@ Example messages
|
||||
[json.exception.type_error.320] cannot save a discarded json_document
|
||||
```
|
||||
|
||||
```
|
||||
[json.exception.type_error.320] json_document images need a little-endian target
|
||||
```
|
||||
|
||||
Note
|
||||
|
||||
This exception was added in version 3.13.0 unreleased, together with [images](https://json.nlohmann.me/features/json_view/#images).
|
||||
@@ -986,7 +1012,7 @@ The following code shows how an `out_of_range` exception can be caught.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
@@ -1000,7 +1026,7 @@ int main()
|
||||
{
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << std::endl;
|
||||
<< "exception id: " << e.id << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
@@ -1080,7 +1106,7 @@ number overflow parsing '10E1000'
|
||||
|
||||
An integer number cannot be represented by the binary format it is serialized to:
|
||||
|
||||
- [BON8](https://json.nlohmann.me/features/binary_formats/bon8/index.md) only stores integers that fit into int64, so [`to_bon8`](https://json.nlohmann.me/api/basic_json/to_bon8/index.md) throws for unsigned integers greater than 9223372036854775807.
|
||||
- [BON8](https://json.nlohmann.me/features/binary_formats/bon8/index.md) only stores integers that fit into int64, so [`to_bon8`](https://json.nlohmann.me/api/basic_json/to_bon8/index.md) throws for unsigned integers greater than 9223372036854775807 and, with a number type wider than 64 bits, for any integer outside the int64 range.
|
||||
- [CBOR](https://json.nlohmann.me/features/binary_formats/cbor/index.md), [MessagePack](https://json.nlohmann.me/features/binary_formats/messagepack/index.md), and [BSON](https://json.nlohmann.me/features/binary_formats/bson/index.md) store integers in at most 64 bits. With the default number types, every integer fits, but a [`number_integer_t`](https://json.nlohmann.me/api/basic_json/number_integer_t/index.md) or [`number_unsigned_t`](https://json.nlohmann.me/api/basic_json/number_unsigned_t/index.md) wider than 64 bits (e.g., `__int128`) can hold values outside the range of the format: [-2^64, 2^64-1] for CBOR, [-2^63, 2^64-1] for MessagePack, and the range of int64 (signed integers) or uint64 (unsigned integers) for BSON.
|
||||
|
||||
[UBJSON](https://json.nlohmann.me/features/binary_formats/ubjson/index.md) and [BJData](https://json.nlohmann.me/features/binary_formats/bjdata/index.md) never throw this exception, because they serialize integers beyond 64 bits as high-precision numbers.
|
||||
@@ -1092,7 +1118,7 @@ The UBJSON and BSON writers used to throw this exception as well:
|
||||
- Since version 3.9.0, integer numbers beyond int64 are serialized as high-precision UBJSON numbers.
|
||||
- Since version 3.12.0, integer numbers beyond int64 are serialized as uint64 BSON numbers.
|
||||
|
||||
Before version 3.13.0 unreleased, CBOR, MessagePack, and BSON silently truncated integers wider than 64 bits, and BJData truncated unsigned integers wider than 64 bits.
|
||||
Before version 3.13.0 unreleased, CBOR, MessagePack, and BSON silently truncated integers wider than 64 bits, and BJData truncated unsigned integers wider than 64 bits that were elements of ND-arrays with `"_ArrayType_": "uint64"`.
|
||||
|
||||
Example messages
|
||||
|
||||
@@ -1108,7 +1134,7 @@ integer number 1267650600228229401496703205376 cannot be represented by CBOR as
|
||||
|
||||
The size of an array or object in a [binary format](https://json.nlohmann.me/features/binary_formats/index.md) exceeds the maximal capacity: the size following `#` for [UBJSON](https://json.nlohmann.me/features/binary_formats/ubjson/index.md)/[BJData](https://json.nlohmann.me/features/binary_formats/bjdata/index.md), or the encoded length for [CBOR](https://json.nlohmann.me/features/binary_formats/cbor/index.md).
|
||||
|
||||
The exception is also thrown for a [UBJSON](https://json.nlohmann.me/features/binary_formats/ubjson/index.md) array of a type that is encoded by its marker alone (`Z`, `T` or `F`) whose declared count exceeds 1,048,576 (`1 << 20`). Such an array has no payload, so its count alone decides how much memory is allocated, and a handful of bytes would otherwise describe billions of values. [`to_ubjson`](https://json.nlohmann.me/api/basic_json/to_ubjson/index.md) writes longer arrays of these types without the size and type annotation, so any value it produces can still be read back.
|
||||
The exception is also thrown for a [UBJSON](https://json.nlohmann.me/features/binary_formats/ubjson/index.md) array of a type that is encoded by its marker alone (`Z`, `T` or `F`) whose declared count exceeds 1,048,576 (`1 << 20`). Such an array has no payload, so its count alone decides how much memory is allocated, and a handful of bytes would otherwise describe billions of values. [`to_ubjson`](https://json.nlohmann.me/api/basic_json/to_ubjson/index.md) writes longer arrays of these types without the `$` type annotation (the `#` count and one marker per element are kept), so any value it produces can still be read back.
|
||||
|
||||
Example messages
|
||||
|
||||
@@ -1146,9 +1172,11 @@ Example message
|
||||
|
||||
```
|
||||
enum value out of range
|
||||
array index 18446744073709551616 exceeds size_type
|
||||
array index 18446744073709551615 exceeds size_type
|
||||
```
|
||||
|
||||
The second message is thrown, for instance, by `json::parse("[1, 2]").at("/18446744073709551615"_json_pointer)` on a 64-bit platform, where `size_type` is `std::size_t` and this index is `SIZE_MAX`. An index that does not fit into 64 bits (such as `18446744073709551616`) is not reported as 410 but as [`out_of_range.404`](#jsonexceptionout_of_range404).
|
||||
|
||||
### json.exception.out_of_range.411
|
||||
|
||||
A JSON Patch `add` operation cannot be applied because the target location's parent is neither an object nor an array. Per [RFC 6902](https://datatracker.ietf.org/doc/html/rfc6902), an `add` target must reference a member of an existing object or an element of an existing array; a primitive value (string, number, boolean, etc.) cannot receive a new member or element.
|
||||
@@ -1163,6 +1191,8 @@ Note
|
||||
|
||||
This exception was added in version 3.13.0 unreleased. Before that, this situation hit an internal assertion (aborting the program in debug builds) or was silently ignored when assertions were disabled.
|
||||
|
||||
A `null` parent is rejected as well. Before version 3.13.0 unreleased, an `add` into a `null` parent silently converted it to an object (e.g., `add` at `/foo/bar` turned `{"foo":null}` into `{"foo":{"bar":1}}`).
|
||||
|
||||
### json.exception.out_of_range.412
|
||||
|
||||
BSON stores the length of documents, arrays, strings, and binary values in a signed 32-bit integer, and MessagePack stores the length of strings, binary values, arrays, and objects in at most an unsigned 32-bit integer. This exception is thrown when a value is too large to be described by such a length field.
|
||||
@@ -1211,14 +1241,18 @@ This exception was added in version 3.13.0 unreleased. Before that, this situati
|
||||
|
||||
### json.exception.out_of_range.415
|
||||
|
||||
MessagePack's ext type and BSON's binary subtype are each stored in a single byte. This exception is thrown when serializing a [`byte_container_with_subtype`](https://json.nlohmann.me/api/byte_container_with_subtype/index.md) whose subtype exceeds 255.
|
||||
MessagePack's ext type and BSON's binary subtype are each stored in a single byte. This exception is thrown when serializing a [`byte_container_with_subtype`](https://json.nlohmann.me/api/byte_container_with_subtype/index.md) whose subtype exceeds 255, the largest value the library can store in that byte.
|
||||
|
||||
Example message
|
||||
Example messages
|
||||
|
||||
```
|
||||
[json.exception.out_of_range.415] subtype 70000 is too large for the MessagePack ext type (max 255)
|
||||
```
|
||||
|
||||
```
|
||||
[json.exception.out_of_range.415] subtype 70000 is too large for the BSON binary subtype (max 255)
|
||||
```
|
||||
|
||||
Note
|
||||
|
||||
This exception was added in version 3.13.0 unreleased. Before that, subtypes above 255 were silently truncated modulo 256 instead of raising an error.
|
||||
@@ -1259,7 +1293,7 @@ The following code shows how an `other_error` exception can be caught.
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
using namespace nlohmann::literals;
|
||||
|
||||
int main()
|
||||
@@ -1283,7 +1317,7 @@ int main()
|
||||
{
|
||||
// output exception information
|
||||
std::cout << "message: " << e.what() << '\n'
|
||||
<< "exception id: " << e.id << std::endl;
|
||||
<< "exception id: " << e.id << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
@@ -1309,7 +1343,7 @@ Executing `{"op":"test", "path":"/baz", "value":"bar"}` on `{"baz": "qux"}`:
|
||||
|
||||
### json.exception.other_error.502
|
||||
|
||||
[`to_ubjson`](https://json.nlohmann.me/api/basic_json/to_ubjson/index.md) and [`to_bjdata`](https://json.nlohmann.me/api/basic_json/to_bjdata/index.md) were called with `use_type = true` but `use_size = false`. UBJSON requires a size marker (`#`) after a type marker (`$`).
|
||||
[`to_ubjson`](https://json.nlohmann.me/api/basic_json/to_ubjson/index.md) and [`to_bjdata`](https://json.nlohmann.me/api/basic_json/to_bjdata/index.md) were called with `use_type = true` but `use_size = false`, and the value contains a non-empty array or object (or, with BJData Draft 3, any binary value). UBJSON requires a size marker (`#`) after a type marker (`$`); scalars and empty arrays or objects do not throw.
|
||||
|
||||
Example message
|
||||
|
||||
|
||||
+234
-1
@@ -58,6 +58,208 @@ json j{obj}; // -> {"key":"value"} (copy, not array)
|
||||
|
||||
Without the macro (default behavior), `json j{obj}` creates `[{"key":"value"}]`. This opt-in macro fixes issue #5074 while preserving backwards compatibility for existing code.
|
||||
|
||||
## Getting started
|
||||
|
||||
### Which file do I need?
|
||||
|
||||
!!! question
|
||||
|
||||
Do I have to clone the repository or build the library?
|
||||
|
||||
No. The library is header-only: the single file [`json.hpp`](https://github.com/nlohmann/json/releases) from the
|
||||
releases page is all you need, including the `_json` literals. Put it in a directory `nlohmann` on your include path.
|
||||
Companion headers (`json_fwd.hpp`, `json_view.hpp`, `json_literals.hpp`) are only needed if you use them. See
|
||||
[Integration](../integration/index.md#header-only).
|
||||
|
||||
### Using CMake or a package manager
|
||||
|
||||
!!! question
|
||||
|
||||
How do I add the library with CMake, Conan, vcpkg, Homebrew, or another tool?
|
||||
|
||||
See [CMake](../integration/cmake.md) for `find_package`, `add_subdirectory`, and `FetchContent`, and
|
||||
[Package managers](../integration/package_managers.md) for the list of supported package managers.
|
||||
|
||||
### The IDE cannot open the header
|
||||
|
||||
!!! question
|
||||
|
||||
The compiler finds `nlohmann/json.hpp`, but my IDE reports "cannot open source file". Why?
|
||||
|
||||
The compiler's include path is set correctly, but the IDE's is not. Add the same directory to the include paths of the
|
||||
IDE (or of its language server); the build itself is not affected.
|
||||
|
||||
### Compile times
|
||||
|
||||
!!! question
|
||||
|
||||
Including the library slows down my build. What can I do?
|
||||
|
||||
Include [`json_fwd.hpp`](../integration/compile_times.md#include-json_fwdhpp-in-headers) in headers and `json.hpp` only
|
||||
in the source files that need it, instantiate `basic_json` once, and consider precompiled headers or
|
||||
[C++20 modules](../features/modules.md). See [Compile times](../integration/compile_times.md).
|
||||
|
||||
## Parsing
|
||||
|
||||
### Parsing a file fails with "unexpected end of input"
|
||||
|
||||
!!! question
|
||||
|
||||
`json::parse(file)` throws `parse_error.101` at line 1, column 1 for a file that is valid JSON. Why?
|
||||
|
||||
The parser did not see any character: the file was most likely not opened. A relative path is resolved against the
|
||||
working directory of the running program, which is often the build directory of your IDE, not the source directory.
|
||||
Check `is_open()` and try an absolute path. Other causes are an empty file and a stream that was already read. See
|
||||
[`parse_error.101`](exceptions.md#jsonexceptionparse_error101).
|
||||
|
||||
### Input that arrives in chunks
|
||||
|
||||
!!! question
|
||||
|
||||
My data comes from a socket in pieces. How do I parse it?
|
||||
|
||||
The parser cannot be resumed. Frame the messages (one value per line, a length prefix) and parse each complete frame, or
|
||||
buffer the chunks until the value is complete; a `parse_error` at the end of the buffer means the input ended
|
||||
prematurely. See [Large, streamed, and partial input](../features/parsing/large_and_partial_input.md#input-arriving-in-chunks).
|
||||
|
||||
### Several values in one stream
|
||||
|
||||
!!! question
|
||||
|
||||
How do I read concatenated JSON values or one value per line?
|
||||
|
||||
Read newline-delimited input line by line ([JSON Lines](../features/parsing/json_lines.md)). For concatenated values, use
|
||||
`operator>>` and check for the end of the stream before each read, as shown in
|
||||
[Several values in one stream](../features/parsing/large_and_partial_input.md#several-values-in-one-stream).
|
||||
|
||||
### Files that are too large for memory
|
||||
|
||||
!!! question
|
||||
|
||||
How do I process a huge JSON file?
|
||||
|
||||
Handle and discard the records of a large array with a [parser callback](../features/parsing/parser_callbacks.md), stop
|
||||
early with the [SAX interface](../features/parsing/sax_interface.md), or read parts of the text through a
|
||||
[`json_document`](../features/json_view.md) (added in version 3.13.0). See
|
||||
[Input too large for memory](../features/parsing/large_and_partial_input.md#input-too-large-for-memory).
|
||||
|
||||
### Position of a parse error
|
||||
|
||||
!!! question
|
||||
|
||||
How do I get the line and column of a parse error?
|
||||
|
||||
The message contains them. The exception stores the byte index in `byte`, from which you can compute both; see
|
||||
[Where did the error occur?](../features/parsing/parse_exceptions.md#where-did-the-error-occur). To locate a value that
|
||||
causes a *later* error, such as a `type_error`, use
|
||||
[`JSON_DIAGNOSTIC_POSITIONS`](../features/parsing/parse_exceptions.md#where-is-the-value-that-caused-a-later-error).
|
||||
|
||||
### Comments and trailing commas
|
||||
|
||||
!!! question
|
||||
|
||||
Can the parser read JSON with comments or trailing commas?
|
||||
|
||||
Yes, when asked to: see [Comments](../features/comments.md) and [Trailing commas](../features/trailing_commas.md). Both
|
||||
are rejected by default.
|
||||
|
||||
## Accessing and creating values
|
||||
|
||||
### Reading a value into a variable
|
||||
|
||||
!!! question
|
||||
|
||||
How do I get a C++ value out of a `json` value?
|
||||
|
||||
Use [`get<T>()`](../api/basic_json/get.md), for example `#!cpp int age = j["age"].get<int>();`, or an implicit conversion.
|
||||
`#!cpp auto x = j["age"];` is **not** a conversion: it copies the `json` value. See
|
||||
[Converting values](../features/conversions.md).
|
||||
|
||||
### Strings are printed with quotes
|
||||
|
||||
!!! question
|
||||
|
||||
`std::cout << j["name"]` prints `"Mary"` with quotes. How do I get the string?
|
||||
|
||||
The value is a `json`, and printing it produces JSON text. Convert it first: `#!cpp j["name"].get<std::string>()`. See
|
||||
[Getting a string without quotes](../features/conversions.md#getting-values-out).
|
||||
|
||||
### Testing whether a key exists
|
||||
|
||||
!!! question
|
||||
|
||||
How do I check if a key exists, without changing the object?
|
||||
|
||||
Use `contains` or `find`. Do not test with the non-const `operator[]`: like `std::map::operator[]`, it inserts a `null`
|
||||
value for a missing key. See [Does this key exist?](../features/element_access/index.md#does-this-key-exist).
|
||||
|
||||
### Reading a value with a fallback
|
||||
|
||||
!!! question
|
||||
|
||||
How do I read a value that may be missing?
|
||||
|
||||
Use [`value`](../features/element_access/default_value.md), which returns a default for a missing key. It still throws if
|
||||
the key exists with a different type; see [Working without exceptions](../features/no_exceptions.md).
|
||||
|
||||
### Iterating and nested values
|
||||
|
||||
!!! question
|
||||
|
||||
How do I loop over an array or object, or reach a nested value?
|
||||
|
||||
See [Iterators](../features/iterators.md) and [`items()`](../api/basic_json/items.md) for loops, and
|
||||
[JSON Pointer](../features/json_pointer.md) to address or test a nested value by path.
|
||||
|
||||
### Unexpected arrays when creating values
|
||||
|
||||
!!! question
|
||||
|
||||
Why does `json j{x}` or `{{"a", 1}, {"b"}}` produce an array instead of what I expected?
|
||||
|
||||
Braces create arrays and objects based on their content, and single-element braces create a one-element array. See
|
||||
[Brace initialization yields arrays](#brace-initialization-yields-arrays) and the table in
|
||||
[Creating values](../features/creating_values.md#what-does-this-produce).
|
||||
|
||||
### Keeping the order of object keys
|
||||
|
||||
!!! question
|
||||
|
||||
The keys of my object come out sorted. How do I keep the insertion order?
|
||||
|
||||
Use `ordered_json`, and call `ordered_json::parse` when reading. See [Object order](../features/object_order.md).
|
||||
|
||||
## Converting your own types
|
||||
|
||||
### Structs, enums, and optional fields
|
||||
|
||||
!!! question
|
||||
|
||||
How do I convert my own types to and from JSON?
|
||||
|
||||
Write `to_json`/`from_json` functions or use the `NLOHMANN_DEFINE_TYPE_*` macros; see
|
||||
[Arbitrary type conversions](../features/arbitrary_types.md). Enums can be mapped to strings
|
||||
([Enum conversion](../features/enum_conversion.md)), and an empty `std::optional` can be omitted
|
||||
([Omitting a field](../features/conversions.md#omitting-a-field-when-serializing-stdoptional)).
|
||||
|
||||
### Smart pointers, variants, chrono, and class hierarchies
|
||||
|
||||
!!! question
|
||||
|
||||
Why can't I convert `std::shared_ptr`, `std::variant`, `std::chrono` types, or a pointer to a base class?
|
||||
|
||||
There is more than one sensible JSON representation for them, so the library leaves the choice to you.
|
||||
[Recipes for common types](../features/type_recipes.md) shows one for each.
|
||||
|
||||
### My `to_json` is not found
|
||||
|
||||
!!! question
|
||||
|
||||
I wrote `to_json`/`from_json`, but the compiler does not find them. Why?
|
||||
|
||||
Typical causes are a type alias of a standard type, a function in the wrong namespace, or a declaration that comes too
|
||||
late. See [Why isn't my `to_json` found?](../features/arbitrary_types.md#why-isnt-my-to_json-or-from_json-found).
|
||||
|
||||
## Limitations
|
||||
|
||||
### Relaxed parsing
|
||||
@@ -203,6 +405,36 @@ Not directly, but the companion project [json-schema-validator](https://github.c
|
||||
builds JSON Schema (draft 7; draft 4 in its older, now-superseded 1.x releases) validation on top of this library
|
||||
and is a common recommendation for this use case.
|
||||
|
||||
### Memory use
|
||||
|
||||
!!! question
|
||||
|
||||
Does the library leak memory? My process stays large after I free a `json` value.
|
||||
|
||||
Destroying a value frees everything it owns. Freed memory is returned to the allocator, which does not necessarily give
|
||||
it back to the operating system, so a high resident size alone is not a leak. Copies are deep, and `clear()` keeps the
|
||||
capacity of an array. See [Memory](../features/performance.md#memory), and use Valgrind or the sanitizers to tell a leak
|
||||
from retained memory.
|
||||
|
||||
### Reproducible builds
|
||||
|
||||
!!! question
|
||||
|
||||
The header path ends up in my binary. How do I get path-independent builds?
|
||||
|
||||
The runtime assertions embed `__FILE__`. Define `NDEBUG` (the default for release builds) or map the path prefix; see
|
||||
[Notes for builds and distribution](../integration/index.md#notes-for-builds-and-distribution).
|
||||
|
||||
### Slow debug builds
|
||||
|
||||
!!! question
|
||||
|
||||
Parsing a large file is very slow in my debug build. Can I compile the library with optimizations?
|
||||
|
||||
The library is header-only, so there is no separate source file. Keep the code that uses `json` in its own source file and
|
||||
compile that file with optimizations; see
|
||||
[Notes for builds and distribution](../integration/index.md#notes-for-builds-and-distribution).
|
||||
|
||||
## Exceptions
|
||||
|
||||
### Parsing without exceptions
|
||||
@@ -211,7 +443,8 @@ and is a common recommendation for this use case.
|
||||
|
||||
Is it possible to indicate a parse error without throwing an exception?
|
||||
|
||||
Yes, see [Parsing and exceptions](../features/parsing/parse_exceptions.md).
|
||||
Yes, see [Parsing and exceptions](../features/parsing/parse_exceptions.md) and
|
||||
[Working without exceptions](../features/no_exceptions.md).
|
||||
|
||||
|
||||
### Key name in exceptions
|
||||
|
||||
+6
-6
@@ -1,4 +1,4 @@
|
||||
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</code></pre></div> <p>and</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=nf>j</span><span class=p>(</span><span class=nb>true</span><span class=p>);</span>
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</code></pre></div> <p>yield different results (<code class=highlight><span class=p>[</span><span class=kc>true</span><span class=p>]</span></code> vs. <code class=highlight><span class=kc>true</span></code>)?</p> </div> <p>This is a known issue, and -- even worse -- the behavior differs between <abbr title="GNU Compiler Collection">GCC</abbr> and Clang. The "culprit" for this is the library's constructor overloads for initializer lists to allow syntax like</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=n>array</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{</span><span class=mi>1</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>,</span><span class=w> </span><span class=mi>3</span><span class=p>,</span><span class=w> </span><span class=mi>4</span><span class=p>};</span>
|
||||
</code></pre></div> <p>for arrays and</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=n>object</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{{</span><span class=s>"one"</span><span class=p>,</span><span class=w> </span><span class=mi>1</span><span class=p>},</span><span class=w> </span><span class=p>{</span><span class=s>"two"</span><span class=p>,</span><span class=w> </span><span class=mi>2</span><span class=p>}};</span><span class=w> </span>
|
||||
@@ -8,16 +8,16 @@
|
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<span class=n>json</span><span class=w> </span><span class=n>obj</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=p>{{</span><span class=s>"key"</span><span class=p>,</span><span class=w> </span><span class=s>"value"</span><span class=p>}};</span>
|
||||
<span class=n>json</span><span class=w> </span><span class=n>j</span><span class=p>{</span><span class=n>obj</span><span class=p>};</span><span class=w> </span><span class=c1>// -> {"key":"value"} (copy, not array)</span>
|
||||
</code></pre></div> <p>Without the macro (default behavior), <code>json j{obj}</code> creates <code>[{"key":"value"}]</code>. This opt-in macro fixes issue #5074 while preserving backwards compatibility for existing code.</p> <h2 id=limitations>Limitations<a class=headerlink href=#limitations title="Permanent link">¶</a></h2> <h3 id=relaxed-parsing>Relaxed parsing<a class=headerlink href=#relaxed-parsing title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Can you add an option to ignore trailing commas?</p> </div> <p>Yes, trailing commas in arrays and objects can be allowed by setting parameter <code>ignore_trailing_commas</code> of <a href=../../api/basic_json/parse/ ><code>parse</code></a> to <code class=highlight><span class=nb>true</span></code>; see <a href=../../features/trailing_commas/ >trailing commas</a>. They are rejected by default, and the library never adds them when serializing.</p> <h3 id=parse-errors-reading-non-ascii-characters>Parse errors reading non-<abbr title="American Standard Code for Information Interchange">ASCII</abbr> characters<a class=headerlink href=#parse-errors-reading-non-ascii-characters title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why is the parser complaining about a Chinese character?</li> <li>Does the library support Unicode?</li> <li>I get an exception <code>[json.exception.parse_error.101] parse error at line 1, column 53: syntax error while parsing value - invalid string: ill-formed UTF-8 byte; last read: '"Testé$')"</code></li> </ul> </div> <p>The library supports <strong>Unicode input</strong> as follows:</p> <ul> <li><strong><abbr title="Unicode Transformation Format">UTF</abbr>-8</strong> encoded input is supported, which is the default encoding for <abbr title="JavaScript Object Notation">JSON</abbr>, according to <a href="https://tools.ietf.org/html/rfc8259.html#section-8.1"><abbr title="Request for Comments">RFC</abbr> 8259</a>.</li> <li><code>std::u16string</code> and <code>std::u32string</code> can be parsed, assuming <abbr title="Unicode Transformation Format">UTF</abbr>-16 and <abbr title="Unicode Transformation Format">UTF</abbr>-32 encoding, respectively; <code>std::wstring</code> works as well and is interpreted as <abbr title="Unicode Transformation Format">UTF</abbr>-16 or <abbr title="Unicode Transformation Format">UTF</abbr>-32, depending on the width of the platform's <code>wchar_t</code>. These encodings cannot be read from a <code>FILE*</code> or a <code>std::istream</code>, which carry bytes only.</li> <li>Ill-formed <abbr title="Unicode Transformation Format">UTF</abbr>-16 or <abbr title="Unicode Transformation Format">UTF</abbr>-32 input is rejected: a lone surrogate, a high surrogate that is not followed by its low surrogate, and a code point above <code>U+10FFFF</code> all yield a parse error. The same holds for iterators over 2- or 4-byte characters.</li> <li>Other encodings such as Latin-1 or <abbr title="International Organization for Standardization">ISO</abbr> 8859-1 are <strong>not</strong> supported and will yield parse or serialization errors.</li> <li>The library will not replace <a href="http://www.unicode.org/faq/private_use.html#nonchar1">Unicode noncharacters</a>.</li> <li>Invalid surrogates (e.g., incomplete pairs such as <code>\uDEAD</code>) will yield parse errors.</li> <li>The strings stored in the library are <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded. When using the default string type (<code>std::string</code>), note that its length/size functions return the number of stored bytes rather than the number of characters or glyphs.</li> <li>When you store strings with different encodings in the library, calling <a href=../../api/basic_json/dump/ ><code>dump()</code></a> may throw an exception unless <code>json::error_handler_t::replace</code>, <code>json::error_handler_t::ignore</code>, or <code>json::error_handler_t::keep</code> are used as error handlers.</li> </ul> <p>In most cases, the parser is right to complain, because the input is not <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded. This is especially true for Microsoft Windows, where Latin-1 or <abbr title="International Organization for Standardization">ISO</abbr> 8859-1 is often the standard encoding.</p> <h3 id=nul-bytes-in-the-input>NUL bytes in the input<a class=headerlink href=#nul-bytes-in-the-input title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why does <a href=../../api/basic_json/parse/ ><code>json::parse()</code></a> silently ignore part of my input?</li> <li>Why does a <code>std::string</code>/buffer with extra data after the <abbr title="JavaScript Object Notation">JSON</abbr> text parse without error, while a similar-looking string with extra text does not?</li> </ul> </div> <p>A <code>'\0'</codLine truncated
|
||||
</code></pre></div> <p>Without the macro (default behavior), <code>json j{obj}</code> creates <code>[{"key":"value"}]</code>. This opt-in macro fixes issue #5074 while preserving backwards compatibility for existing code.</p> <h2 id=getting-started>Getting started<a class=headerlink href=#getting-started title="Permanent link">¶</a></h2> <h3 id=which-file-do-i-need>Which file do I need?<a class=headerlink href=#which-file-do-i-need title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Do I have to clone the repository or build the library?</p> </div> <p>No. The library is header-only: the single file <a href="https://github.com/nlohmann/json/releases"><code>json.hpp</code></a> from the releases page is all you need, including the <code>_json</code> literals. Put it in a directory <code>nlohmann</code> on your include path. Companion headers (<code>json_fwd.hpp</code>, <code>json_view.hpp</code>, <code>json_literals.hpp</code>) are only needed if you use them. See <a href=../../integration/#header-only>Integration</a>.</p> <h3 id=using-cmake-or-a-package-manager>Using CMake or a package manager<a class=headerlink href=#using-cmake-or-a-package-manager title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>How do I add the library with CMake, Conan, vcpkg, Homebrew, or another tool?</p> </div> <p>See <a href=../../integration/cmake/ >CMake</a> for <code>find_package</code>, <code>add_subdirectory</code>, and <code>FetchContent</code>, and <a href=../../integration/package_managers/ >Package managers</a> for the list of supported package managers.</p> <h3 id=the-ide-cannot-open-the-header>The <abbr title="Integrated Development Environment">IDE</abbr> cannot open the header<a class=headerlink href=#the-ide-cannot-open-the-header title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>The compiler finds <code>nlohmann/json.hpp</code>, but my <abbr title="Integrated Development Environment">IDE</abbr> reports "cannot open source file". Why?</p> </div> <p>The compiler's include path is set correctly, but the <abbr title="Integrated Development Environment">IDE</abbr>'s is not. Add the same directory to the include paths of the <abbr title="Integrated Development Environment">IDE</abbr> (or of its language server); the build itself is not affected.</p> <h3 id=compile-times>Compile times<a class=headerlink href=#compile-times title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Including the library slows down my build. What can I do?</p> </div> <p>Include <a href=../../integration/compile_times/#include-json_fwdhpp-in-headers><code>json_fwd.hpp</code></a> in headers and <code>json.hpp</code> only in the source files that need it, instantiate <code>basic_json</code> once, and consider precompiled headers or <a href=../../features/modules/ >C++20 modules</a>. See <a href=../../integration/compile_times/ >Compile times</a>.</p> <h2 id=parsing>Parsing<a class=headerlink href=#parsing title="Permanent link">¶</a></h2> <h3 id=parsing-a-file-fails-with-unexpected-end-of-input>Parsing a file fails with "unexpected end of input"<a class=headerlink href=#parsing-a-file-fails-with-unexpected-end-of-input title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p><code>json::parse(file)</code> throws <code>parse_error.101</code> at line 1, column 1 for a file that is valid <abbr title="JavaScript Object Notation">JSON</abbr>. Why?</p> </div> <p>The parser did not see any character: the file was most likely not opened. A relative path is resolved against the working directory of the running program, which is often the build directory of your <abbr title="Integrated Development Environment">IDE</abbr>, not the source directory. Check <code>is_open()</code> and try an absolute path. Other causes are an empty file and a stream that was already read. See <a href=../exceptions/#jsonexceptionparse_error101><code>parse_error.101</code></a>.</p> <h3 id=input-that-arrives-in-chunks>Input that arrives in chunks<a class=headerlink href=#input-that-arrives-in-chunks title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>My data comes from a socket in pieces. How do I parse it?</p> </div> <p>The parser cannot be resumed. Frame the messages (one value per line, a length prefix) and parse each complete frame, or buffer the chunks until the value is complete; a <code>parse_error</code> at the end of the buffer means the input ended prematurely. See <a href=../../features/parsing/large_and_partial_input/#input-arriving-in-chunks>Large, streamed, and partial input</a>.</p> <h3 id=several-values-in-one-stream>Several values in one stream<a class=headerlink href=#several-values-in-oneLine truncated
|
||||
<span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=n>std</span><span class=o>::</span><span class=n>string</span><span class=p>(</span><span class=s>"123"</span><span class=p>)</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=sc>'\0'</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=s>"true"</span><span class=p>);</span><span class=w> </span><span class=c1>// == 123, the "true" is silently ignored too</span>
|
||||
</code></pre></div> <p>This is different from any other unexpected trailing byte, which <em>does</em> raise <a href=../exceptions/#jsonexceptionparse_error101><code>parse_error.101</code></a>:</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=s>"123x"</span><span class=p>);</span><span class=w> </span><span class=c1>// throws parse_error.101: unexpected additional data</span>
|
||||
</code></pre></div> <p>This falls out of the same convention used when no explicit input length is given at all: <code>json::parse(const char*)</code> already stops at the first NUL byte via <code>strlen()</code>, since a bare pointer has no length of its own. The library applies that same NUL-terminated-C-string convention uniformly, rather than only when a length is genuinely unavailable — so a <code>std::string</code>, iterator range, or container whose content happens to include a NUL byte is affected the same way a raw <code>const char*</code> would be.</p> <p>If your input may contain a trailing or embedded NUL that is <strong>not</strong> meant to signal the end of the <abbr title="JavaScript Object Notation">JSON</abbr> text — for instance, a fixed-size, zero-padded buffer — trim it yourself before calling <code>parse()</code>, since the library will otherwise silently stop there instead of raising an error:</p> <div class=highlight><pre><span></span><code><span class=n>s</span><span class=p>.</span><span class=n>resize</span><span class=p>(</span><span class=n>s</span><span class=p>.</span><span class=n>find</span><span class=p>(</span><span class=sc>'\0'</span><span class=p>));</span><span class=w> </span><span class=c1>// drop everything from the first NUL onward, if any</span>
|
||||
</code></pre></div> <p>This falls out of the same convention used when no explicit input length is given at all: <code>json::parse(const char*)</code> already stops at the first <abbr title="Null character (U+0000, byte value 0)">NUL</abbr> byte via <code>strlen()</code>, since a bare pointer has no length of its own. The library applies that same <abbr title="Null character (U+0000, byte value 0)">NUL</abbr>-terminated-C-string convention uniformly, rather than only when a length is genuinely unavailable — so a <code>std::string</code>, iterator range, or container whose content happens to include a <abbr title="Null character (U+0000, byte value 0)">NUL</abbr> byte is affected the same way a raw <code>const char*</code> would be.</p> <p>If your input may contain a trailing or embedded <abbr title="Null character (U+0000, byte value 0)">NUL</abbr> that is <strong>not</strong> meant to signal the end of the <abbr title="JavaScript Object Notation">JSON</abbr> text — for instance, a fixed-size, zero-padded buffer — trim it yourself before calling <code>parse()</code>, since the library will otherwise silently stop there instead of raising an error:</p> <div class=highlight><pre><span></span><code><span class=n>s</span><span class=p>.</span><span class=n>resize</span><span class=p>(</span><span class=n>s</span><span class=p>.</span><span class=n>find</span><span class=p>(</span><span class=sc>'\0'</span><span class=p>));</span><span class=w> </span><span class=c1>// drop everything from the first NUL onward, if any</span>
|
||||
<span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=n>s</span><span class=p>);</span>
|
||||
</code></pre></div> <p><strong>Opt-in strict handling (since version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>)</strong></p> <p>Manually trimming every input is easy to forget. If you define <a href=../../api/macros/json_strict_nul_handling/ ><code>JSON_STRICT_NUL_HANDLING</code></a> to <code>1</code> before including the library, a <code>'\0'</code> byte is instead rejected like any other unexpected byte and raises <code>parse_error.101</code>, instead of being treated as end of input:</p> <div class=highlight><pre><span></span><code><span class=cp>#define JSON_STRICT_NUL_HANDLING 1</span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=n>std</span><span class=o>::</span><span class=n>string</span><span class=p>(</span><span class=s>"123"</span><span class=p>)</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=sc>'\0'</span><span class=p>);</span><span class=w> </span><span class=c1>// throws parse_error.101 instead of silently returning 123</span>
|
||||
</code></pre></div> <p>This macro defaults to <code>0</code> (disabled, preserving the behavior described above) to avoid breaking existing code that may depend on it, even unknowingly; it is planned to become the default in version 4.0.0. See <a href=../../api/macros/json_strict_nul_handling/ >its documentation</a> for details, including how it also affects <code>char</code> arrays such as string literals.</p> <p>Note that this is unrelated to an <em>unescaped</em> NUL byte occurring <strong>inside</strong> a quoted <abbr title="JavaScript Object Notation">JSON</abbr> string, which is a different, already-invalid case and is correctly rejected either way:</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=n>std</span><span class=o>::</span><span class=n>string</span><span class=p>(</span><span class=s>"</span><span class=se>\"</span><span class=s>"</span><span class=p>)</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=sc>'\0'</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=s>"</span><span class=se>\"</span><span class=s>"</span><span class=p>);</span><span class=w> </span><span class=c1>// throws parse_error.101: control character U+0000 (NUL) must be escaped to \u0000</span>
|
||||
</code></pre></div> <p>This macro defaults to <code>0</code> (disabled, preserving the behavior described above) to avoid breaking existing code that may depend on it, even unknowingly; it is planned to become the default in version 4.0.0. See <a href=../../api/macros/json_strict_nul_handling/ >its documentation</a> for details, including how it also affects <code>char</code> arrays such as string literals.</p> <p>Note that this is unrelated to an <em>unescaped</em> <abbr title="Null character (U+0000, byte value 0)">NUL</abbr> byte occurring <strong>inside</strong> a quoted <abbr title="JavaScript Object Notation">JSON</abbr> string, which is a different, already-invalid case and is correctly rejected either way:</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=o>::</span><span class=n>parse</span><span class=p>(</span><span class=n>std</span><span class=o>::</span><span class=n>string</span><span class=p>(</span><span class=s>"</span><span class=se>\"</span><span class=s>"</span><span class=p>)</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=sc>'\0'</span><span class=w> </span><span class=o>+</span><span class=w> </span><span class=s>"</span><span class=se>\"</span><span class=s>"</span><span class=p>);</span><span class=w> </span><span class=c1>// throws parse_error.101: control character U+0000 (NUL) must be escaped to \u0000</span>
|
||||
</code></pre></div> <h3 id=wide-string-handling>Wide string handling<a class=headerlink href=#wide-string-handling title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Why are wide strings (e.g., <code>std::wstring</code>) dumped as arrays of numbers?</p> </div> <p>As described <a href=#parse-errors-reading-non-ascii-characters>above</a>, the library stores its strings as <abbr title="Unicode Transformation Format">UTF</abbr>-8. To store a wide string as a string, convert it to a <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded <code>std::string</code> first, as in the example below.</p> <div class="admonition example"> <p class=admonition-title>Example</p> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><codecvt></span><span class=w> </span><span class=c1>// codecvt_utf8</span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><locale></span><span class=w> </span><span class=c1>// wstring_convert</span>
|
||||
|
||||
@@ -39,7 +39,7 @@
|
||||
<span class=w> </span><span class=nt>"encoded"</span><span class=p>:</span><span class=w> </span><span class=s2>"車B1234 こんにちは"</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"original"</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=mi>36554</span><span class=p>,</span><span class=w> </span><span class=mi>66</span><span class=p>,</span><span class=w> </span><span class=mi>49</span><span class=p>,</span><span class=w> </span><span class=mi>50</span><span class=p>,</span><span class=w> </span><span class=mi>51</span><span class=p>,</span><span class=w> </span><span class=mi>52</span><span class=p>,</span><span class=w> </span><span class=mi>32</span><span class=p>,</span><span class=w> </span><span class=mi>12371</span><span class=p>,</span><span class=w> </span><span class=mi>12435</span><span class=p>,</span><span class=w> </span><span class=mi>12395</span><span class=p>,</span><span class=w> </span><span class=mi>12385</span><span class=p>,</span><span class=w> </span><span class=mi>12399</span><span class=p>]</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> </div> <h2 id=usage>Usage<a class=headerlink href=#usage title="Permanent link">¶</a></h2> <h3 id=thread-safety>Thread safety<a class=headerlink href=#thread-safety title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is <code>basic_json</code> thread-safe?</p> </div> <p>No. <code>basic_json</code> provides no built-in synchronization, the same as <code>std::map</code> or <code>std::vector</code>. Concurrent reads of the same value from multiple threads are safe, as are concurrent (non-overlapping) accesses to independent <code>json</code> objects. However, any concurrent write to a <code>json</code> object -- or a concurrent read while another thread writes to the same object -- is a data race and requires external synchronization (e.g., a <code>std::mutex</code>) by the caller.</p> <h3 id=schema-validation>Schema validation<a class=headerlink href=#schema-validation title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Does this library support <abbr title="JavaScript Object Notation">JSON</abbr> Schema validation?</p> </div> <p>Not directly, but the companion project <a href="https://github.com/pboettch/json-schema-validator">json-schema-validator</a> builds <abbr title="JavaScript Object Notation">JSON</abbr> Schema (draft 7; draft 4 in its older, now-superseded 1.x releases) validation on top of this library and is a common recommendation for this use case.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">¶</a></h2> <h3 id=parsing-without-exceptions>Parsing without exceptions<a class=headerlink href=#parsing-without-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is it possible to indicate a parse error without throwing an exception?</p> </div> <p>Yes, see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a>.</p> <h3 id=key-name-in-exceptions>Key name in exceptions<a class=headerlink href=#key-name-in-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Can I get the key of the object item that caused an exception?</p> </div> <p>Yes, you can. Please define the symbol <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> to get <a href=../exceptions/#extended-diagnostic-messages>extended diagnostics messages</a>.</p> <h2 id=serialization-issues>Serialization issues<a class=headerlink href=#serialization-issues title="Permanent link">¶</a></h2> <h3 id=number-precision>Number precision<a class=headerlink href=#number-precision title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <ul> <li>It seems that precision is lost when serializing a double.</li> <li>Can I change the precision for floating-point serialization?</li> </ul> </div> <p>The library serializes floating-point numbers with the shortest representation that parses back to the same value, using at most <code>std::numeric_limits<number_float_t>::max_digits10</code> (17 for <abbr title="Institute of Electrical and Electronics Engineers">IEEE</abbr> <code>double</code>s) significant digits. This guarantees that value -> string -> value round-trips. The reverse direction, string -> value -> string, is only guaranteed for numbers with at most <code>std::numeric_limits<number_float_t>::digits10</code> (15 for <abbr title="Institute of Electrical and Electronics Engineers">IEEE</abbr> <code>double</code>s) significant digits; a number with more digits may not be representable exactly and is then serialized as the closest <code>double</code>.</p> <div class="admonition quote"> <p class=admonition-title><a href="https://en.cppreference.com/w/cpp/types/numeric_limits/max_digits10">cppreference.com</a></p> <p>The value of <code>std::numeric_limits<T>::max_digits10</code> is the number of base-10 digits that are necessary to uniquely represent all distinct values of the type T, such as necessary for serialization/deserialization to text.</p> </div> <div class="admonition tip"> <p class=admonition-title>Tip</p> <p>The website <a href="https://float.exposed">https://float.exposed</a> gives a good insight into the internal storage of floating-point numbers.</p> </div> <p>See <a href=../../features/types/number_handling/#number-serialization>this section</a> on the library's number handling for more information.</p> <h3 id=serializing-untrusted-or-invalid-utf-8>Serializing untrusted or invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8<a class=headerlink href=#serializing-untrusted-or-invalid-utf-8 title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why does <code>dump()</code> throw when I serializLine truncated
|
||||
</code></pre></div> </div> <h2 id=usage>Usage<a class=headerlink href=#usage title="Permanent link">¶</a></h2> <h3 id=thread-safety>Thread safety<a class=headerlink href=#thread-safety title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is <code>basic_json</code> thread-safe?</p> </div> <p>No. <code>basic_json</code> provides no built-in synchronization, the same as <code>std::map</code> or <code>std::vector</code>. Concurrent reads of the same value from multiple threads are safe, as are concurrent (non-overlapping) accesses to independent <code>json</code> objects. However, any concurrent write to a <code>json</code> object -- or a concurrent read while another thread writes to the same object -- is a data race and requires external synchronization (e.g., a <code>std::mutex</code>) by the caller.</p> <h3 id=schema-validation>Schema validation<a class=headerlink href=#schema-validation title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Does this library support <abbr title="JavaScript Object Notation">JSON</abbr> Schema validation?</p> </div> <p>Not directly, but the companion project <a href="https://github.com/pboettch/json-schema-validator">json-schema-validator</a> builds <abbr title="JavaScript Object Notation">JSON</abbr> Schema (draft 7; draft 4 in its older, now-superseded 1.x releases) validation on top of this library and is a common recommendation for this use case.</p> <h3 id=memory-use>Memory use<a class=headerlink href=#memory-use title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Does the library leak memory? My process stays large after I free a <code>json</code> value.</p> </div> <p>Destroying a value frees everything it owns. Freed memory is returned to the allocator, which does not necessarily give it back to the operating system, so a high resident size alone is not a leak. Copies are deep, and <code>clear()</code> keeps the capacity of an array. See <a href=../../features/performance/#memory>Memory</a>, and use Valgrind or the sanitizers to tell a leak from retained memory.</p> <h3 id=reproducible-builds>Reproducible builds<a class=headerlink href=#reproducible-builds title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>The header path ends up in my binary. How do I get path-independent builds?</p> </div> <p>The runtime assertions embed <code>__FILE__</code>. Define <code>NDEBUG</code> (the default for release builds) or map the path prefix; see <a href=../../integration/#notes-for-builds-and-distribution>Notes for builds and distribution</a>.</p> <h3 id=slow-debug-builds>Slow debug builds<a class=headerlink href=#slow-debug-builds title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Parsing a large file is very slow in my debug build. Can I compile the library with optimizations?</p> </div> <p>The library is header-only, so there is no separate source file. Keep the code that uses <code>json</code> in its own source file and compile that file with optimizations; see <a href=../../integration/#notes-for-builds-and-distribution>Notes for builds and distribution</a>.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">¶</a></h2> <h3 id=parsing-without-exceptions>Parsing without exceptions<a class=headerlink href=#parsing-without-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Is it possible to indicate a parse error without throwing an exception?</p> </div> <p>Yes, see <a href=../../features/parsing/parse_exceptions/ >Parsing and exceptions</a> and <a href=../../features/no_exceptions/ >Working without exceptions</a>.</p> <h3 id=key-name-in-exceptions>Key name in exceptions<a class=headerlink href=#key-name-in-exceptions title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Can I get the key of the object item that caused an exception?</p> </div> <p>Yes, you can. Please define the symbol <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> to get <a href=../exceptions/#extended-diagnostic-messages>extended diagnostics messages</a>.</p> <h2 id=serialization-issues>Serialization issues<a class=headerlink href=#serialization-issues title="Permanent link">¶</a></h2> <h3 id=number-precision>Number precision<a class=headerlink href=#number-precision title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <ul> <li>It seems that precision is lost when serializing a double.</li> <li>Can I change the precision for floating-point serialization?</li> </ul> </div> <p>The library serializes floating-point numbers with theLine truncated
|
||||
<span class=k>const</span><span class=w> </span><span class=k>auto</span><span class=w> </span><span class=n>s</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>j</span><span class=p>.</span><span class=n>dump</span><span class=p>(</span><span class=mi>-1</span><span class=p>,</span><span class=w> </span><span class=sc>' '</span><span class=p>,</span><span class=w> </span><span class=nb>false</span><span class=p>,</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>error_handler_t</span><span class=o>::</span><span class=n>replace</span><span class=p>);</span>
|
||||
</code></pre></div> <h3 id=using-json-values-with-stdformat-or-fmt>Using <abbr title="JavaScript Object Notation">JSON</abbr> values with <code>std::format</code> or <code>fmt</code><a class=headerlink href=#using-json-values-with-stdformat-or-fmt title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <ul> <li>Can I use <code>std::format("{}", j)</code> on a <abbr title="JavaScript Object Notation">JSON</abbr> value?</li> <li>Can I use <code>fmt::format("{}", j)</code> or <code>fmt::print("{}", j)</code> (the <a href="https://github.com/fmtlib/fmt">{fmt}</a> library) on a <abbr title="JavaScript Object Notation">JSON</abbr> value?</li> </ul> </div> <p><code>std::format</code> works out of the box since version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, as long as the standard library provides <code><format></code> (see <a href=../../api/macros/json_has_std_format/ ><code>JSON_HAS_STD_FORMAT</code></a>); see <a href=../../api/basic_json/std_formatter/ ><code>std::formatter<basic_json></code></a> for details, including the <code class=highlight><span class=s>"{:#}"</span></code> pretty-print spec, indent widths (<code class=highlight><span class=s>"{:2}"</span></code>), and custom indent characters (<code class=highlight><span class=s>"{:.>#}"</span></code>).</p> <p>For <code>fmt</code>, the library ships <a href=../../api/basic_json/format_as/ ><code>format_as</code></a>, a small customization point <code>fmt</code> looks for via argument-dependent lookup. It only has an effect on fmt 10.0.0 through 11.0.2 — from fmt 11.1.0 onwards, <code>fmt</code> no longer picks up a <code>format_as</code> overload that returns a <code>std::string</code>. On such versions (or any version, if you also want the same <code class=highlight><span class=s>"{:#}"</span></code>/width/fill-and-align spec support that <code>std::formatter<basic_json></code> has), define your own <code>fmt::formatter</code> specialization; see <a href=../../api/basic_json/format_as/ ><code>format_as</code></a> for a recipe that mirrors it.</p> <p>If you get ambiguous-overload errors when passing a <abbr title="JavaScript Object Notation">JSON</abbr> value to <code>fmt::format</code>/<code>fmt::print</code> without any <code>fmt::formatter<json></code> specialization in scope, that's <code>fmt</code> picking up <code>basic_json</code>'s implicit <code>operator ValueType()</code> conversion operator (see <a href="https://github.com/nlohmann/json/issues/964">#964</a> and <a href="https://github.com/nlohmann/json/issues/958">#958</a>); disabling it via <a href=../../api/macros/json_use_implicit_conversions/ ><code>JSON_USE_IMPLICIT_CONVERSIONS 0</code></a> avoids the ambiguity.</p> <h2 id=compilation-issues>Compilation issues<a class=headerlink href=#compilation-issues title="Permanent link">¶</a></h2> <h3 id=android-sdk>Android <abbr title="Software Development Kit">SDK</abbr><a class=headerlink href=#android-sdk title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Why does the code not compile with Android <abbr title="Software Development Kit">SDK</abbr>?</p> </div> <p>Since <a href="https://github.com/android/ndk/wiki/Changelog-r18"><abbr title="Native Development Kit">NDK</abbr> r18</a> (2018), <abbr title="GNU Compiler Collection">GCC</abbr> and the <code>gnustl</code>/<code>stlport</code> C++ libraries have been removed from the Android <abbr title="Native Development Kit">NDK</abbr>; Clang and <code>libc++</code> are now the only compiler and C++ library, and they support C++11 and later out of the box. With a current <abbr title="Native Development Kit">NDK</abbr>, no special configuration is needed to use this library.</p> <p>Only very old NDKs (before r18), which defaulted to <abbr title="GNU Compiler Collection">GCC</abbr> and <code>gnustl</code>, lacked C++11 library features such as <code>std::to_string</code>. If you run into this, update to a current <abbr title="Native Development Kit">NDK</abbr>.</p> <h3 id=incomplete-detector-type-with-gcc-11>Incomplete <code>detector</code> type with <abbr title="GNU Compiler Collection">GCC</abbr> < 11<a class=headerlink href=#incomplete-detector-type-with-gcc-11 title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Question</p> <p>Why does <abbr title="GNU Compiler Collection">GCC</abbr> 10 or older fail with <code>invalid use of incomplete type 'struct nlohmann::detail::detector<..., to_json_function, ...>'</code> for a type that holds an <code>optional</code> member?</p> </div> <p>This happens with <abbr title="GNU Compiler Collection">GCC</abbr> 10 and older in C++11/C++14 mode when all of these hold:</p> <ul> <li>a class <code>Holder</code> has an <code>optional<Dummy></code> member (e.g., <code>boost::optiLine truncated
|
||||
<span class=w> </span><span class=k>public</span><span class=o>:</span>
|
||||
@@ -56,4 +56,4 @@
|
||||
|
||||
<span class=w> </span><span class=k>friend</span><span class=w> </span><span class=kt>void</span><span class=w> </span><span class=nf>to_json</span><span class=p>(</span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>&</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>Holder</span><span class=o>&</span><span class=w> </span><span class=n>h</span><span class=p>)</span><span class=w> </span><span class=p>{</span><span class=w> </span><span class=cm>/* ... */</span><span class=w> </span><span class=p>}</span>
|
||||
<span class=p>};</span>
|
||||
</code></pre></div> <p>The <a href=../../api/macros/nlohmann_define_type_intrusive/ ><code>NLOHMANN_DEFINE_TYPE_INTRUSIVE</code></a> macros define hidden friends as well. See <a href="https://github.com/nlohmann/json/issues/3669">#3669</a> for details.</p> <h3 id=missing-stl-function>Missing <abbr title="Standard Template Library">STL</abbr> function<a class=headerlink href=#missing-stl-function title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why do I get a compilation error <code>'to_string' is not a member of 'std'</code> (or similarly, for <code>strtod</code> or <code>strtof</code>)?</li> <li>Why does the code not compile with MinGW or Android <abbr title="Software Development Kit">SDK</abbr>?</li> </ul> </div> <p>This is not an issue with the code, but rather with the compiler itself. On Android, use a current <abbr title="Native Development Kit">NDK</abbr> (see above). For MinGW, please refer to <a href="http://tehsausage.com/mingw-to-string">this site</a> and <a href="https://github.com/nlohmann/json/issues/136">this discussion</a> for information on how to fix this bug.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 25, 2026 05:18:07 UTC">October 25, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, CLine truncated
|
||||
</code></pre></div> <p>The <a href=../../api/macros/nlohmann_define_type_intrusive/ ><code>NLOHMANN_DEFINE_TYPE_INTRUSIVE</code></a> macros define hidden friends as well. See <a href="https://github.com/nlohmann/json/issues/3669">#3669</a> for details.</p> <h3 id=missing-stl-function>Missing <abbr title="Standard Template Library">STL</abbr> function<a class=headerlink href=#missing-stl-function title="Permanent link">¶</a></h3> <div class="admonition question"> <p class=admonition-title>Questions</p> <ul> <li>Why do I get a compilation error <code>'to_string' is not a member of 'std'</code> (or similarly, for <code>strtod</code> or <code>strtof</code>)?</li> <li>Why does the code not compile with <abbr title="Minimalist GNU for Windows">MinGW</abbr> or Android <abbr title="Software Development Kit">SDK</abbr>?</li> </ul> </div> <p>This is not an issue with the code, but rather with the compiler itself. On Android, use a current <abbr title="Native Development Kit">NDK</abbr> (see above). For <abbr title="Minimalist GNU for Windows">MinGW</abbr>, please refer to <a href="http://tehsausage.com/mingw-to-string">this site</a> and <a href="https://github.com/nlohmann/json/issues/136">this discussion</a> for information on how to fix this bug.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 25, 2026 11:07:13 UTC">October 25, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontaweLine truncated
|
||||
+193
-1
@@ -58,6 +58,174 @@ json j{obj}; // -> {"key":"value"} (copy, not array)
|
||||
|
||||
Without the macro (default behavior), `json j{obj}` creates `[{"key":"value"}]`. This opt-in macro fixes issue #5074 while preserving backwards compatibility for existing code.
|
||||
|
||||
## Getting started
|
||||
|
||||
### Which file do I need?
|
||||
|
||||
Question
|
||||
|
||||
Do I have to clone the repository or build the library?
|
||||
|
||||
No. The library is header-only: the single file [`json.hpp`](https://github.com/nlohmann/json/releases) from the releases page is all you need, including the `_json` literals. Put it in a directory `nlohmann` on your include path. Companion headers (`json_fwd.hpp`, `json_view.hpp`, `json_literals.hpp`) are only needed if you use them. See [Integration](https://json.nlohmann.me/integration/#header-only).
|
||||
|
||||
### Using CMake or a package manager
|
||||
|
||||
Question
|
||||
|
||||
How do I add the library with CMake, Conan, vcpkg, Homebrew, or another tool?
|
||||
|
||||
See [CMake](https://json.nlohmann.me/integration/cmake/index.md) for `find_package`, `add_subdirectory`, and `FetchContent`, and [Package managers](https://json.nlohmann.me/integration/package_managers/index.md) for the list of supported package managers.
|
||||
|
||||
### The IDE cannot open the header
|
||||
|
||||
Question
|
||||
|
||||
The compiler finds `nlohmann/json.hpp`, but my IDE reports "cannot open source file". Why?
|
||||
|
||||
The compiler's include path is set correctly, but the IDE's is not. Add the same directory to the include paths of the IDE (or of its language server); the build itself is not affected.
|
||||
|
||||
### Compile times
|
||||
|
||||
Question
|
||||
|
||||
Including the library slows down my build. What can I do?
|
||||
|
||||
Include [`json_fwd.hpp`](https://json.nlohmann.me/integration/compile_times/#include-json_fwdhpp-in-headers) in headers and `json.hpp` only in the source files that need it, instantiate `basic_json` once, and consider precompiled headers or [C++20 modules](https://json.nlohmann.me/features/modules/index.md). See [Compile times](https://json.nlohmann.me/integration/compile_times/index.md).
|
||||
|
||||
## Parsing
|
||||
|
||||
### Parsing a file fails with "unexpected end of input"
|
||||
|
||||
Question
|
||||
|
||||
`json::parse(file)` throws `parse_error.101` at line 1, column 1 for a file that is valid JSON. Why?
|
||||
|
||||
The parser did not see any character: the file was most likely not opened. A relative path is resolved against the working directory of the running program, which is often the build directory of your IDE, not the source directory. Check `is_open()` and try an absolute path. Other causes are an empty file and a stream that was already read. See [`parse_error.101`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error101).
|
||||
|
||||
### Input that arrives in chunks
|
||||
|
||||
Question
|
||||
|
||||
My data comes from a socket in pieces. How do I parse it?
|
||||
|
||||
The parser cannot be resumed. Frame the messages (one value per line, a length prefix) and parse each complete frame, or buffer the chunks until the value is complete; a `parse_error` at the end of the buffer means the input ended prematurely. See [Large, streamed, and partial input](https://json.nlohmann.me/features/parsing/large_and_partial_input/#input-arriving-in-chunks).
|
||||
|
||||
### Several values in one stream
|
||||
|
||||
Question
|
||||
|
||||
How do I read concatenated JSON values or one value per line?
|
||||
|
||||
Read newline-delimited input line by line ([JSON Lines](https://json.nlohmann.me/features/parsing/json_lines/index.md)). For concatenated values, use `operator>>` and check for the end of the stream before each read, as shown in [Several values in one stream](https://json.nlohmann.me/features/parsing/large_and_partial_input/#several-values-in-one-stream).
|
||||
|
||||
### Files that are too large for memory
|
||||
|
||||
Question
|
||||
|
||||
How do I process a huge JSON file?
|
||||
|
||||
Handle and discard the records of a large array with a [parser callback](https://json.nlohmann.me/features/parsing/parser_callbacks/index.md), stop early with the [SAX interface](https://json.nlohmann.me/features/parsing/sax_interface/index.md), or read parts of the text through a [`json_document`](https://json.nlohmann.me/features/json_view/index.md) (added in version 3.13.0 unreleased). See [Input too large for memory](https://json.nlohmann.me/features/parsing/large_and_partial_input/#input-too-large-for-memory).
|
||||
|
||||
### Position of a parse error
|
||||
|
||||
Question
|
||||
|
||||
How do I get the line and column of a parse error?
|
||||
|
||||
The message contains them. The exception stores the byte index in `byte`, from which you can compute both; see [Where did the error occur?](https://json.nlohmann.me/features/parsing/parse_exceptions/#where-did-the-error-occur). To locate a value that causes a *later* error, such as a `type_error`, use [`JSON_DIAGNOSTIC_POSITIONS`](https://json.nlohmann.me/features/parsing/parse_exceptions/#where-is-the-value-that-caused-a-later-error).
|
||||
|
||||
### Comments and trailing commas
|
||||
|
||||
Question
|
||||
|
||||
Can the parser read JSON with comments or trailing commas?
|
||||
|
||||
Yes, when asked to: see [Comments](https://json.nlohmann.me/features/comments/index.md) and [Trailing commas](https://json.nlohmann.me/features/trailing_commas/index.md). Both are rejected by default.
|
||||
|
||||
## Accessing and creating values
|
||||
|
||||
### Reading a value into a variable
|
||||
|
||||
Question
|
||||
|
||||
How do I get a C++ value out of a `json` value?
|
||||
|
||||
Use [`get<T>()`](https://json.nlohmann.me/api/basic_json/get/index.md), for example `int age = j["age"].get<int>();`, or an implicit conversion. `auto x = j["age"];` is **not** a conversion: it copies the `json` value. See [Converting values](https://json.nlohmann.me/features/conversions/index.md).
|
||||
|
||||
### Strings are printed with quotes
|
||||
|
||||
Question
|
||||
|
||||
`std::cout << j["name"]` prints `"Mary"` with quotes. How do I get the string?
|
||||
|
||||
The value is a `json`, and printing it produces JSON text. Convert it first: `j["name"].get<std::string>()`. See [Getting a string without quotes](https://json.nlohmann.me/features/conversions/#getting-values-out).
|
||||
|
||||
### Testing whether a key exists
|
||||
|
||||
Question
|
||||
|
||||
How do I check if a key exists, without changing the object?
|
||||
|
||||
Use `contains` or `find`. Do not test with the non-const `operator[]`: like `std::map::operator[]`, it inserts a `null` value for a missing key. See [Does this key exist?](https://json.nlohmann.me/features/element_access/#does-this-key-exist).
|
||||
|
||||
### Reading a value with a fallback
|
||||
|
||||
Question
|
||||
|
||||
How do I read a value that may be missing?
|
||||
|
||||
Use [`value`](https://json.nlohmann.me/features/element_access/default_value/index.md), which returns a default for a missing key. It still throws if the key exists with a different type; see [Working without exceptions](https://json.nlohmann.me/features/no_exceptions/index.md).
|
||||
|
||||
### Iterating and nested values
|
||||
|
||||
Question
|
||||
|
||||
How do I loop over an array or object, or reach a nested value?
|
||||
|
||||
See [Iterators](https://json.nlohmann.me/features/iterators/index.md) and [`items()`](https://json.nlohmann.me/api/basic_json/items/index.md) for loops, and [JSON Pointer](https://json.nlohmann.me/features/json_pointer/index.md) to address or test a nested value by path.
|
||||
|
||||
### Unexpected arrays when creating values
|
||||
|
||||
Question
|
||||
|
||||
Why does `json j{x}` or `{{"a", 1}, {"b"}}` produce an array instead of what I expected?
|
||||
|
||||
Braces create arrays and objects based on their content, and single-element braces create a one-element array. See [Brace initialization yields arrays](#brace-initialization-yields-arrays) and the table in [Creating values](https://json.nlohmann.me/features/creating_values/#what-does-this-produce).
|
||||
|
||||
### Keeping the order of object keys
|
||||
|
||||
Question
|
||||
|
||||
The keys of my object come out sorted. How do I keep the insertion order?
|
||||
|
||||
Use `ordered_json`, and call `ordered_json::parse` when reading. See [Object order](https://json.nlohmann.me/features/object_order/index.md).
|
||||
|
||||
## Converting your own types
|
||||
|
||||
### Structs, enums, and optional fields
|
||||
|
||||
Question
|
||||
|
||||
How do I convert my own types to and from JSON?
|
||||
|
||||
Write `to_json`/`from_json` functions or use the `NLOHMANN_DEFINE_TYPE_*` macros; see [Arbitrary type conversions](https://json.nlohmann.me/features/arbitrary_types/index.md). Enums can be mapped to strings ([Enum conversion](https://json.nlohmann.me/features/enum_conversion/index.md)), and an empty `std::optional` can be omitted ([Omitting a field](https://json.nlohmann.me/features/conversions/#omitting-a-field-when-serializing-stdoptional)).
|
||||
|
||||
### Smart pointers, variants, chrono, and class hierarchies
|
||||
|
||||
Question
|
||||
|
||||
Why can't I convert `std::shared_ptr`, `std::variant`, `std::chrono` types, or a pointer to a base class?
|
||||
|
||||
There is more than one sensible JSON representation for them, so the library leaves the choice to you. [Recipes for common types](https://json.nlohmann.me/features/type_recipes/index.md) shows one for each.
|
||||
|
||||
### My `to_json` is not found
|
||||
|
||||
Question
|
||||
|
||||
I wrote `to_json`/`from_json`, but the compiler does not find them. Why?
|
||||
|
||||
Typical causes are a type alias of a standard type, a function in the wrong namespace, or a declaration that comes too late. See [Why isn't my `to_json` found?](https://json.nlohmann.me/features/arbitrary_types/#why-isnt-my-to_json-or-from_json-found).
|
||||
|
||||
## Limitations
|
||||
|
||||
### Relaxed parsing
|
||||
@@ -194,6 +362,30 @@ Does this library support JSON Schema validation?
|
||||
|
||||
Not directly, but the companion project [json-schema-validator](https://github.com/pboettch/json-schema-validator) builds JSON Schema (draft 7; draft 4 in its older, now-superseded 1.x releases) validation on top of this library and is a common recommendation for this use case.
|
||||
|
||||
### Memory use
|
||||
|
||||
Question
|
||||
|
||||
Does the library leak memory? My process stays large after I free a `json` value.
|
||||
|
||||
Destroying a value frees everything it owns. Freed memory is returned to the allocator, which does not necessarily give it back to the operating system, so a high resident size alone is not a leak. Copies are deep, and `clear()` keeps the capacity of an array. See [Memory](https://json.nlohmann.me/features/performance/#memory), and use Valgrind or the sanitizers to tell a leak from retained memory.
|
||||
|
||||
### Reproducible builds
|
||||
|
||||
Question
|
||||
|
||||
The header path ends up in my binary. How do I get path-independent builds?
|
||||
|
||||
The runtime assertions embed `__FILE__`. Define `NDEBUG` (the default for release builds) or map the path prefix; see [Notes for builds and distribution](https://json.nlohmann.me/integration/#notes-for-builds-and-distribution).
|
||||
|
||||
### Slow debug builds
|
||||
|
||||
Question
|
||||
|
||||
Parsing a large file is very slow in my debug build. Can I compile the library with optimizations?
|
||||
|
||||
The library is header-only, so there is no separate source file. Keep the code that uses `json` in its own source file and compile that file with optimizations; see [Notes for builds and distribution](https://json.nlohmann.me/integration/#notes-for-builds-and-distribution).
|
||||
|
||||
## Exceptions
|
||||
|
||||
### Parsing without exceptions
|
||||
@@ -202,7 +394,7 @@ Question
|
||||
|
||||
Is it possible to indicate a parse error without throwing an exception?
|
||||
|
||||
Yes, see [Parsing and exceptions](https://json.nlohmann.me/features/parsing/parse_exceptions/index.md).
|
||||
Yes, see [Parsing and exceptions](https://json.nlohmann.me/features/parsing/parse_exceptions/index.md) and [Working without exceptions](https://json.nlohmann.me/features/no_exceptions/index.md).
|
||||
|
||||
### Key name in exceptions
|
||||
|
||||
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/license/" rel="canonical"><link rel=prev href=../..><link href=../faq/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>License - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-component=search role=diaLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/license/" rel="canonical"><link rel=prev href=../..><link href=../faq/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>License - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/" rel="canonical"><link href=../exceptions/ rel=prev><link href=unreleased/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Overview - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/" rel="canonical"><link href=../exceptions/ rel=prev><link href=unreleased/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Overview - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search data-md-componenLine truncated
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@@ -1 +1 @@
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/unreleased/" rel="canonical"><link href=../ rel=prev><link href=../v3.12.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Unreleased - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div classLine truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/unreleased/" rel="canonical"><link href=../ rel=prev><link href=../v3.12.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Unreleased - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div classLine truncated
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||||
@@ -6,13 +6,13 @@ These changes are part of the `develop` branch, but not of a release yet.
|
||||
|
||||
## API changes
|
||||
|
||||
**Added (90 pages):**
|
||||
**Added (88 pages):**
|
||||
|
||||
- `basic_json`: [`as_base_class`](https://json.nlohmann.me/api/basic_json/as_base_class/index.md), [`format_as(basic_json)`](https://json.nlohmann.me/api/basic_json/format_as/index.md), [`from_bon8`](https://json.nlohmann.me/api/basic_json/from_bon8/index.md), [`merge_diff`](https://json.nlohmann.me/api/basic_json/merge_diff/index.md), [`basic_json>`](https://json.nlohmann.me/api/basic_json/std_formatter/index.md), [`to_bon8`](https://json.nlohmann.me/api/basic_json/to_bon8/index.md), [`with_t`](https://json.nlohmann.me/api/basic_json/with_t/index.md)
|
||||
- `basic_json_document`: [(overview)](https://json.nlohmann.me/api/basic_json_document/index.md), [`accept`](https://json.nlohmann.me/api/basic_json_document/accept/index.md), [`basic_json_document`](https://json.nlohmann.me/api/basic_json_document/basic_json_document/index.md), [`erase`](https://json.nlohmann.me/api/basic_json_document/erase/index.md), [`insert`](https://json.nlohmann.me/api/basic_json_document/insert/index.md), [`is_discarded`](https://json.nlohmann.me/api/basic_json_document/is_discarded/index.md), [`load`](https://json.nlohmann.me/api/basic_json_document/load/index.md), [`memory_usage`](https://json.nlohmann.me/api/basic_json_document/memory_usage/index.md), [`node_count`](https://json.nlohmann.me/api/basic_json_document/node_count/index.md), [`owns_source`](https://json.nlohmann.me/api/basic_json_document/owns_source/index.md), [`parse`](https://json.nlohmann.me/api/basic_json_document/parse/index.md), [`parse_copy`](https://json.nlohmann.me/api/basic_json_document/parse_copy/index.md), [`push_back`](https://json.nlohmann.me/api/basic_json_document/push_back/index.md), [`read`](https://json.nlohmann.me/api/basic_json_document/read/index.md), [`root`](https://json.nlohmann.me/api/basic_json_document/root/index.md), [`save`](https://json.nlohmann.me/api/basic_json_document/save/index.md), [`set`](https://json.nlohmann.me/api/basic_json_document/set/index.md), [`shrink_to_fit`](https://json.nlohmann.me/api/basic_json_document/shrink_to_fit/index.md), [`source`](https://json.nlohmann.me/api/basic_json_document/source/index.md)
|
||||
- `basic_json_view`: [(overview)](https://json.nlohmann.me/api/basic_json_view/index.md), [`at`](https://json.nlohmann.me/api/basic_json_view/at/index.md), [`back`](https://json.nlohmann.me/api/basic_json_view/back/index.md), [`basic_json_view`](https://json.nlohmann.me/api/basic_json_view/basic_json_view/index.md), [`begin`](https://json.nlohmann.me/api/basic_json_view/begin/index.md), [`cbegin`](https://json.nlohmann.me/api/basic_json_view/cbegin/index.md), [`cend`](https://json.nlohmann.me/api/basic_json_view/cend/index.md), [`contains`](https://json.nlohmann.me/api/basic_json_view/contains/index.md), [`count`](https://json.nlohmann.me/api/basic_json_view/count/index.md), [`dump`](https://json.nlohmann.me/api/basic_json_view/dump/index.md), [`empty`](https://json.nlohmann.me/api/basic_json_view/empty/index.md), [`end`](https://json.nlohmann.me/api/basic_json_view/end/index.md), [`find`](https://json.nlohmann.me/api/basic_json_view/find/index.md), [`front`](https://json.nlohmann.me/api/basic_json_view/front/index.md), [`get`](https://json.nlohmann.me/api/basic_json_view/get/index.md), [`get_string`](https://json.nlohmann.me/api/basic_json_view/get_string/index.md), [`get_to`](https://json.nlohmann.me/api/basic_json_view/get_to/index.md), [`is_array`](https://json.nlohmann.me/api/basic_json_view/is_array/index.md), [`is_binary`](https://json.nlohmann.me/api/basic_json_view/is_binary/index.md), [`is_boolean`](https://json.nlohmann.me/api/basic_json_view/is_boolean/index.md), [`is_discarded`](https://json.nlohmann.me/api/basic_json_view/is_discarded/index.md), [`is_null`](https://json.nlohmann.me/api/basic_json_view/is_null/index.md), [`is_number`](https://json.nlohmann.me/api/basic_json_view/is_number/index.md), [`is_number_float`](https://json.nlohmann.me/api/basic_json_view/is_number_float/index.md), [`is_number_integer`](https://json.nlohmann.me/api/basic_json_view/is_number_integer/index.md), [`is_number_unsigned`](https://json.nlohmann.me/api/basic_json_view/is_number_unsigned/index.md), [`is_object`](https://json.nlohmann.me/api/basic_json_view/is_object/index.md), [`is_primitive`](https://json.nlohmann.me/api/basic_json_view/is_primitive/index.md), [`is_string`](https://json.nlohmann.me/api/basic_json_view/is_string/index.md), [`is_structured`](https://json.nlohmann.me/api/basic_json_view/is_structured/index.md), [`items`](https://json.nlohmann.me/api/basic_json_view/items/index.md), [`materialize`](https://json.nlohmann.me/api/basic_json_view/materialize/index.md), [`number_format`](https://json.nlohmann.me/api/basic_json_view/number_format/index.md), [`number_token`](https://json.nlohmann.me/api/basic_json_view/number_token/index.md), [`operator[]`](https://json.nlohmann.me/api/basic_json_view/operator%5B%5D/index.md), [`operator==`](https://json.nlohmann.me/api/basic_json_view/operator_eq/index.md), [`operator<<`](https://json.nlohmann.me/api/basic_json_view/operator_ltlt/index.md), [`operator!=`](https://json.nlohmann.me/api/basic_json_view/operator_ne/index.md), [`size`](https://json.nlohmann.me/api/basic_json_view/size/index.md), [`source_offset`](https://json.nlohmann.me/api/basic_json_view/source_offset/index.md), [`type`](https://json.nlohmann.me/api/basic_json_view/type/index.md), [`type_name`](https://json.nlohmann.me/api/basic_json_view/type_name/index.md), [`value`](https://json.nlohmann.me/api/basic_json_view/value/index.md)
|
||||
- `json_pointer`: [`front`](https://json.nlohmann.me/api/json_pointer/front/index.md), [`pop_front`](https://json.nlohmann.me/api/json_pointer/pop_front/index.md), [`push_front`](https://json.nlohmann.me/api/json_pointer/push_front/index.md)
|
||||
- `macros`: [`JSON_BRACE_INIT_COPY_SEMANTICS`](https://json.nlohmann.me/api/macros/json_brace_init_copy_semantics/index.md), [`JSON_DELETE_DEPRECATED_FUNCTIONS`](https://json.nlohmann.me/api/macros/json_delete_deprecated_functions/index.md), [`JSON_DISABLE_STREAM_BULK_SCAN`](https://json.nlohmann.me/api/macros/json_disable_stream_bulk_scan/index.md), [`JSON_DISABLE_TUPLE_REFERENCE_CONVERSION`](https://json.nlohmann.me/api/macros/json_disable_tuple_reference_conversion/index.md), [`JSON_DISABLE_UNLOCKED_FILE_IO`](https://json.nlohmann.me/api/macros/json_disable_unlocked_file_io/index.md), [`JSON_HAS_RANGE_VIEW_CONVERSION`](https://json.nlohmann.me/api/macros/json_has_range_view_conversion/index.md), [`JSON_HAS_STD_FORMAT`](https://json.nlohmann.me/api/macros/json_has_std_format/index.md), [`JSON_NO_AUTOMATIC_UDLS`](https://json.nlohmann.me/api/macros/json_no_automatic_udls/index.md), [`JSON_NO_SIMD`](https://json.nlohmann.me/api/macros/json_no_simd/index.md), [`JSON_NO_THREAD_LOCAL`](https://json.nlohmann.me/api/macros/json_no_thread_local/index.md), [`JSON_PRECISE_STREAM_POSITION`](https://json.nlohmann.me/api/macros/json_precise_stream_position/index.md), [`JSON_STRICT_BINARY_UTF8`](https://json.nlohmann.me/api/macros/json_strict_binary_utf8/index.md), [`JSON_STRICT_NUL_HANDLING`](https://json.nlohmann.me/api/macros/json_strict_nul_handling/index.md), [`JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS`](https://json.nlohmann.me/api/macros/json_use_objects_for_enum_keyed_maps/index.md), [`JSON_USE_SIMDUTF`](https://json.nlohmann.me/api/macros/json_use_simdutf/index.md), [`JSON_VIEW_NO_SIMD`](https://json.nlohmann.me/api/macros/json_view_no_simd/index.md), [`JSON_VIEW_USE_SSSE3`](https://json.nlohmann.me/api/macros/json_view_use_ssse3/index.md), [`nlohmann_define_type_with_names`](https://json.nlohmann.me/api/macros/nlohmann_define_type_with_names/index.md)
|
||||
- `macros`: [`JSON_BRACE_INIT_COPY_SEMANTICS`](https://json.nlohmann.me/api/macros/json_brace_init_copy_semantics/index.md), [`JSON_DELETE_DEPRECATED_FUNCTIONS`](https://json.nlohmann.me/api/macros/json_delete_deprecated_functions/index.md), [`JSON_DISABLE_STREAM_BULK_SCAN`](https://json.nlohmann.me/api/macros/json_disable_stream_bulk_scan/index.md), [`JSON_DISABLE_TUPLE_REFERENCE_CONVERSION`](https://json.nlohmann.me/api/macros/json_disable_tuple_reference_conversion/index.md), [`JSON_DISABLE_UNLOCKED_FILE_IO`](https://json.nlohmann.me/api/macros/json_disable_unlocked_file_io/index.md), [`JSON_HAS_RANGE_VIEW_CONVERSION`](https://json.nlohmann.me/api/macros/json_has_range_view_conversion/index.md), [`JSON_HAS_STD_FORMAT`](https://json.nlohmann.me/api/macros/json_has_std_format/index.md), [`JSON_NO_AUTOMATIC_UDLS`](https://json.nlohmann.me/api/macros/json_no_automatic_udls/index.md), [`JSON_NO_SIMD`](https://json.nlohmann.me/api/macros/json_no_simd/index.md), [`JSON_NO_THREAD_LOCAL`](https://json.nlohmann.me/api/macros/json_no_thread_local/index.md), [`JSON_PRECISE_STREAM_POSITION`](https://json.nlohmann.me/api/macros/json_precise_stream_position/index.md), [`JSON_STRICT_BINARY_UTF8`](https://json.nlohmann.me/api/macros/json_strict_binary_utf8/index.md), [`JSON_STRICT_NUL_HANDLING`](https://json.nlohmann.me/api/macros/json_strict_nul_handling/index.md), [`JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS`](https://json.nlohmann.me/api/macros/json_use_objects_for_enum_keyed_maps/index.md), [`JSON_USE_SIMDUTF`](https://json.nlohmann.me/api/macros/json_use_simdutf/index.md), [`nlohmann_define_type_with_names`](https://json.nlohmann.me/api/macros/nlohmann_define_type_with_names/index.md)
|
||||
|
||||
**Changed:**
|
||||
|
||||
@@ -91,10 +91,12 @@ These changes are part of the `develop` branch, but not of a release yet.
|
||||
- [`basic_json::parser_callback_t`](https://json.nlohmann.me/api/basic_json/parser_callback_t/index.md): Fixed in version 3.13.0 unreleased to also remove discarded values from a parent object; before, discarding an array or a value stored under an object key left a discarded member behind, which made the parse result serialize to invalid JSON.
|
||||
- [`basic_json::parser_callback_t`](https://json.nlohmann.me/api/basic_json/parser_callback_t/index.md): Fixed in version 3.13.0 unreleased so that discarding an array or object at its start event also hides its content from the callback, as documented above; before, the callback was still called for the content, and the key of every member of a discarded object was kept in memory until the parse ended.
|
||||
- [`basic_json::patch`](https://json.nlohmann.me/api/basic_json/patch/index.md): Added [`out_of_range.411`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range411) and stopped relying on an internal assertion when an "add" operation's target location has a non-object/non-array parent in version 3.13.0 unreleased.
|
||||
- [`basic_json::patch`](https://json.nlohmann.me/api/basic_json/patch/index.md): This includes a `null` parent, which was previously silently converted to an object, in version 3.13.0 unreleased.
|
||||
- [`basic_json::patch`](https://json.nlohmann.me/api/basic_json/patch/index.md): Added [`out_of_range.413`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range413) and stopped silently ignoring a "remove" operation whose target location has a non-object/non-array parent in version 3.13.0 unreleased.
|
||||
- [`basic_json::patch`](https://json.nlohmann.me/api/basic_json/patch/index.md): Added [`out_of_range.414`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range414) and rejected a "move" operation whose "from" location is a proper prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0 unreleased.
|
||||
- [`basic_json::patch`](https://json.nlohmann.me/api/basic_json/patch/index.md): Throws [`parse_error.109`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error109) instead of [`out_of_range.404`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range404) for a one-character array index that is not a digit (e.g., `/x`) in version 3.13.0 unreleased, as it already did for longer ones.
|
||||
- [`basic_json::patch_inplace`](https://json.nlohmann.me/api/basic_json/patch_inplace/index.md): Added [`out_of_range.411`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range411) and stopped relying on an internal assertion when an "add" operation's target location has a non-object/non-array parent in version 3.13.0 unreleased.
|
||||
- [`basic_json::patch_inplace`](https://json.nlohmann.me/api/basic_json/patch_inplace/index.md): This includes a `null` parent, which was previously silently converted to an object, in version 3.13.0 unreleased.
|
||||
- [`basic_json::patch_inplace`](https://json.nlohmann.me/api/basic_json/patch_inplace/index.md): Added [`out_of_range.413`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range413) and stopped silently ignoring a "remove" operation whose target location has a non-object/non-array parent in version 3.13.0 unreleased.
|
||||
- [`basic_json::patch_inplace`](https://json.nlohmann.me/api/basic_json/patch_inplace/index.md): Added [`out_of_range.414`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range414) and rejected a "move" operation whose "from" location is a proper prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0 unreleased.
|
||||
- [`basic_json::patch_inplace`](https://json.nlohmann.me/api/basic_json/patch_inplace/index.md): Throws [`parse_error.109`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error109) instead of [`out_of_range.404`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range404) for a one-character array index that is not a digit (e.g., `/x`) in version 3.13.0 unreleased, as it already did for longer ones.
|
||||
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v1.0.0/" rel="canonical"><link href=../v1.1.0/ rel=prev><link href=../../design_goals/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v1.0.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#v100 class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> v1.0.0 </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=mdLine truncated
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v1.0.0/" rel="canonical"><link href=../v1.1.0/ rel=prev><link href=../../design_goals/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v1.0.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#v100 class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> v1.0.0 </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v1.1.0/" rel="canonical"><link href=../v2.0.0/ rel=prev><link href=../v1.0.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v1.1.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.0/" rel="canonical"><link href=../v2.0.1/ rel=prev><link href=../v1.1.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.1/" rel="canonical"><link href=../v2.0.2/ rel=prev><link href=../v2.0.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.1/" rel="canonical"><link href=../v2.0.2/ rel=prev><link href=../v2.0.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.10/" rel="canonical"><link href=../v2.1.0/ rel=prev><link href=../v2.0.9/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.10 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.10/" rel="canonical"><link href=../v2.1.0/ rel=prev><link href=../v2.0.9/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.10 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.2/" rel="canonical"><link href=../v2.0.3/ rel=prev><link href=../v2.0.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.2/" rel="canonical"><link href=../v2.0.3/ rel=prev><link href=../v2.0.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.3/" rel="canonical"><link href=../v2.0.4/ rel=prev><link href=../v2.0.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.4/" rel="canonical"><link href=../v2.0.5/ rel=prev><link href=../v2.0.3/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.4 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.4/" rel="canonical"><link href=../v2.0.5/ rel=prev><link href=../v2.0.3/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.4 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.5/" rel="canonical"><link href=../v2.0.6/ rel=prev><link href=../v2.0.4/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.5 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.6/" rel="canonical"><link href=../v2.0.7/ rel=prev><link href=../v2.0.5/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.6 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.6/" rel="canonical"><link href=../v2.0.7/ rel=prev><link href=../v2.0.5/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.6 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.7/" rel="canonical"><link href=../v2.0.8/ rel=prev><link href=../v2.0.6/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.7 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.8/" rel="canonical"><link href=../v2.0.9/ rel=prev><link href=../v2.0.7/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.8 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.8/" rel="canonical"><link href=../v2.0.9/ rel=prev><link href=../v2.0.7/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.8 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.0.9/" rel="canonical"><link href=../v2.0.10/ rel=prev><link href=../v2.0.8/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.0.9 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.1.0/" rel="canonical"><link href=../v2.1.1/ rel=prev><link href=../v2.0.10/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.1.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.1.0/" rel="canonical"><link href=../v2.1.1/ rel=prev><link href=../v2.0.10/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.1.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.1.1/" rel="canonical"><link href=../v3.0.0/ rel=prev><link href=../v2.1.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.1.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v2.1.1/" rel="canonical"><link href=../v3.0.0/ rel=prev><link href=../v2.1.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v2.1.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.0.0/" rel="canonical"><link href=../v3.0.1/ rel=prev><link href=../v2.1.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.0.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.0.0/" rel="canonical"><link href=../v3.0.1/ rel=prev><link href=../v2.1.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.0.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.0.1/" rel="canonical"><link href=../v3.1.0/ rel=prev><link href=../v3.0.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.0.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.1.0/" rel="canonical"><link href=../v3.1.1/ rel=prev><link href=../v3.0.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.1.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.1.0/" rel="canonical"><link href=../v3.1.1/ rel=prev><link href=../v3.0.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.1.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.1.1/" rel="canonical"><link href=../v3.1.2/ rel=prev><link href=../v3.1.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.1.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.1.2/" rel="canonical"><link href=../v3.2.0/ rel=prev><link href=../v3.1.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.1.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.1.2/" rel="canonical"><link href=../v3.2.0/ rel=prev><link href=../v3.1.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.1.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.0/" rel="canonical"><link href=../v3.10.1/ rel=prev><link href=../v3.9.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.0/" rel="canonical"><link href=../v3.10.1/ rel=prev><link href=../v3.9.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.1/" rel="canonical"><link href=../v3.10.2/ rel=prev><link href=../v3.10.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.1/" rel="canonical"><link href=../v3.10.2/ rel=prev><link href=../v3.10.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.2/" rel="canonical"><link href=../v3.10.3/ rel=prev><link href=../v3.10.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.2/" rel="canonical"><link href=../v3.10.3/ rel=prev><link href=../v3.10.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.3/" rel="canonical"><link href=../v3.10.4/ rel=prev><link href=../v3.10.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.3/" rel="canonical"><link href=../v3.10.4/ rel=prev><link href=../v3.10.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.4/" rel="canonical"><link href=../v3.10.5/ rel=prev><link href=../v3.10.3/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.4 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.5/" rel="canonical"><link href=../v3.11.0/ rel=prev><link href=../v3.10.4/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.5 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.10.5/" rel="canonical"><link href=../v3.11.0/ rel=prev><link href=../v3.10.4/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.10.5 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.0/" rel="canonical"><link href=../v3.11.1/ rel=prev><link href=../v3.10.5/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.0/" rel="canonical"><link href=../v3.11.1/ rel=prev><link href=../v3.10.5/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.1/" rel="canonical"><link href=../v3.11.2/ rel=prev><link href=../v3.11.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.1/" rel="canonical"><link href=../v3.11.2/ rel=prev><link href=../v3.11.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.2/" rel="canonical"><link href=../v3.11.3/ rel=prev><link href=../v3.11.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.3/" rel="canonical"><link href=../v3.12.0/ rel=prev><link href=../v3.11.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.11.3/" rel="canonical"><link href=../v3.12.0/ rel=prev><link href=../v3.11.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.11.3 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.12.0/" rel="canonical"><link href=../unreleased/ rel=prev><link href=../v3.11.3/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.12.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.12.0/" rel="canonical"><link href=../unreleased/ rel=prev><link href=../v3.11.3/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.12.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#v3120 class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> v3.12.0 </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=mdLine truncated
|
||||
@@ -14,9 +14,9 @@ Fixes bugs found in 3.11.3 and adds several features. No public API was removed
|
||||
|
||||
## API changes
|
||||
|
||||
**Added (4 pages):**
|
||||
**Added (5 pages):**
|
||||
|
||||
- `basic_json`: [`end_pos`](https://json.nlohmann.me/api/basic_json/end_pos/index.md), [`start_pos`](https://json.nlohmann.me/api/basic_json/start_pos/index.md)
|
||||
- `basic_json`: [`bjdata_version_t`](https://json.nlohmann.me/api/basic_json/bjdata_version_t/index.md), [`end_pos`](https://json.nlohmann.me/api/basic_json/end_pos/index.md), [`start_pos`](https://json.nlohmann.me/api/basic_json/start_pos/index.md)
|
||||
- `macros`: [`JSON_DIAGNOSTIC_POSITIONS`](https://json.nlohmann.me/api/macros/json_diagnostic_positions/index.md), [`nlohmann_define_derived_type`](https://json.nlohmann.me/api/macros/nlohmann_define_derived_type/index.md)
|
||||
|
||||
**Changed:**
|
||||
@@ -25,4 +25,4 @@ Fixes bugs found in 3.11.3 and adds several features. No public API was removed
|
||||
- [`basic_json::parse`](https://json.nlohmann.me/api/basic_json/parse/index.md): Changed [runtime assertion](https://json.nlohmann.me/features/assertions/index.md) in case of `FILE*` null pointers to exception in version 3.12.0.
|
||||
- [`basic_json::to_bjdata`](https://json.nlohmann.me/api/basic_json/to_bjdata/index.md): BJData version parameter (for draft3 binary encoding) added in version 3.12.0.
|
||||
- [`JSON_HAS_CPP_11, JSON_HAS_CPP_14, JSON_HAS_CPP_17, JSON_HAS_CPP_20, JSON_HAS_CPP_23, JSON_HAS_CPP_26`](https://json.nlohmann.me/api/macros/json_has_cpp_11/index.md): Added `JSON_HAS_CPP_23` in version 3.12.0.
|
||||
- [`NLOHMANN_JSON_NAMESPACE`](https://json.nlohmann.me/api/macros/nlohmann_json_namespace/index.md): Added the ABI tag `_dp` in version 3.12.0, and the ABI tags `_bics`, `_psp`, `_snul`, `_sbu8`, `_ekmo`, `_dsbs`, `_dufio`, `_ns`, `_vns`, and `_vssse3` in version 3.13.0 unreleased; see [`nlohmann` Namespace](https://json.nlohmann.me/features/namespace/#structure).
|
||||
- [`NLOHMANN_JSON_NAMESPACE`](https://json.nlohmann.me/api/macros/nlohmann_json_namespace/index.md): Added the ABI tag `_dp` in version 3.12.0, and the ABI tags `_bics`, `_psp`, `_snul`, `_sbu8`, `_ekmo`, `_dsbs`, `_dufio`, and `_ns` in version 3.13.0 unreleased; see [`nlohmann` Namespace](https://json.nlohmann.me/features/namespace/#structure).
|
||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.2.0/" rel="canonical"><link href=../v3.3.0/ rel=prev><link href=../v3.1.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.2.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> v3.2.0 </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette 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6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div class=md-search dLine truncated
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.2.0/" rel="canonical"><link href=../v3.3.0/ rel=prev><link href=../v3.1.2/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.2.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> v3.2.0 </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 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||||
@@ -1 +1 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.3.0/" rel="canonical"><link href=../v3.4.0/ rel=prev><link href=../v3.2.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.3.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.7.0/" rel="canonical"><link href=../v3.7.1/ rel=prev><link href=../v3.6.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.7.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.7.1/" rel="canonical"><link href=../v3.7.2/ rel=prev><link href=../v3.7.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.7.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.7.2/" rel="canonical"><link href=../v3.7.3/ rel=prev><link href=../v3.7.1/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.7.2 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.8.0/" rel="canonical"><link href=../v3.9.0/ rel=prev><link href=../v3.7.3/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.8.0 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/home/releases/v3.9.1/" rel="canonical"><link href=../v3.10.0/ rel=prev><link href=../v3.9.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>v3.9.1 - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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