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<span class=k>template</span><span class=o><</span><span class=k>class</span><span class=w> </span><span class=nc>T</span><span class=o>></span>
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<span class=kt>void</span><span class=w> </span><span class=n>from_json</span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>basic_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=n>T</span><span class=o>&</span><span class=w> </span><span class=n>t</span><span class=p>);</span>
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</code></pre></div> <h2 id=additional-features>Additional features<a class=headerlink href=#additional-features title="Permanent link">¶</a></h2> <ul> <li><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</li> <li>Binary formats</li> <li>Custom base class</li> <li>Conversion macros</li> </ul> <h2 id=details-namespace>Details namespace<a class=headerlink href=#details-namespace title="Permanent link">¶</a></h2> <ul> <li>C++ feature backports</li> </ul> <!-- 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="August 7, 2026 17:29:58 UTC">August 7, 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.com LiLine truncated
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</code></pre></div> <h2 id=additional-features>Additional features<a class=headerlink href=#additional-features title="Permanent link">¶</a></h2> <ul> <li><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</li> <li>Binary formats</li> <li>Custom base class</li> <li>Conversion macros</li> </ul> <h2 id=details-namespace>Details namespace<a class=headerlink href=#details-namespace title="Permanent link">¶</a></h2> <ul> <li>C++ feature backports</li> </ul> <!-- 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="August 19, 2026 18:19:47 UTC">August 19, 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.com Line 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/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 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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 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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/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 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|
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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/design_goals/" rel="canonical"><link href=../releases/ 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 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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-searLine truncated
|
||||
+64
-64
@@ -28,8 +28,8 @@
|
||||
<span class=cp>#define JSON_TRY_USER if(true)</span>
|
||||
<span class=cp>#define JSON_CATCH_USER(exception) if(false)</span>
|
||||
<span class=cp>#define JSON_THROW_USER(exception) \</span>
|
||||
<span class=cp> {std::clog << "Error in " << __FILE__ << ":" << __LINE__ \</span>
|
||||
<span class=cp> << " (function " << __FUNCTION__ << ") - " \</span>
|
||||
<span class=cp> {std::clog << "Error in " << __FILE__ << ":" << __LINE__ \</span>
|
||||
<span class=cp> << " (function " << __FUNCTION__ << ") - " \</span>
|
||||
<span class=cp> << (exception).what() << std::endl; \</span>
|
||||
<span class=cp> std::abort();}</span>
|
||||
|
||||
@@ -42,20 +42,20 @@
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"street"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"Fake Street"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"housenumber"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"12"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"street"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"Fake Street"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"housenumber"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"12"</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=k>try</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=kt>int</span><span class=w> </span><span class=n>housenumber</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"housenumber"</span><span class=p>];</span>
|
||||
<span class=w> </span><span class=kt>int</span><span class=w> </span><span class=n>housenumber</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"housenumber"</span><span class=p>];</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=w> </span><span class=k>catch</span><span class=w> </span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>exception</span><span class=o>&</span><span class=w> </span><span class=n>e</span><span class=p>)</span>
|
||||
<span class=w> </span><span class=p>{</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=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=p>;</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=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=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>[json.exception.type_error.302] type must be number, but is string
|
||||
</code></pre></div> <p>This exception can be hard to debug if storing the value <code class=highlight><span class=s>"12"</span></code> and accessing it is further apart.</p> </details> <p>To create better diagnostics messages, each <abbr title="JavaScript Object Notation">JSON</abbr> value needs a pointer to its parent value such that a global context (i.e., a path from the root value to the value that led to the exception) can be created. That global context is provided as <a href=../../features/json_pointer/ ><abbr title="JavaScript Object Notation">JSON</abbr> Pointer</a>.</p> <p>As this global context comes at the price of storing one additional pointer per <abbr title="JavaScript Object Notation">JSON</abbr> value and runtime overhead to maintain the parent relation, extended diagnostics are disabled by default. They can, however, be enabled by defining the preprocessor symbol <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> to <code>1</code> before including <code>json.hpp</code>.</p> <details class=example> <summary>Example</summary> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf><iostream></span>
|
||||
</code></pre></div> <p>This exception can be hard to debug if storing the value <code class=highlight><span class=s>"12"</span></code> and accessing it is further apart.</p> </details> <p>To create better diagnostics messages, each <abbr title="JavaScript Object Notation">JSON</abbr> value needs a pointer to its parent value such that a global context (i.e., a path from the root value to the value that led to the exception) can be created. That global context is provided as <a href=../../features/json_pointer/ ><abbr title="JavaScript Object Notation">JSON</abbr> Pointer</a>.</p> <p>As this global context comes at the price of storing one additional pointer per <abbr title="JavaScript Object Notation">JSON</abbr> value and runtime overhead to maintain the parent relation, extended diagnostics are disabled by default. They can, however, be enabled by defining the preprocessor symbol <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a> to <code>1</code> before including <code>json.hpp</code>.</p> <details class=example> <summary>Example</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># define JSON_DIAGNOSTICS 1</span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
@@ -65,16 +65,16 @@
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"street"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"Fake Street"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"housenumber"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"12"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"street"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"Fake Street"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"housenumber"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"12"</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=k>try</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=kt>int</span><span class=w> </span><span class=n>housenumber</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"housenumber"</span><span class=p>];</span>
|
||||
<span class=w> </span><span class=kt>int</span><span class=w> </span><span class=n>housenumber</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"address"</span><span class=p>][</span><span class=s>"housenumber"</span><span class=p>];</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=w> </span><span class=k>catch</span><span class=w> </span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>exception</span><span class=o>&</span><span class=w> </span><span class=n>e</span><span class=p>)</span>
|
||||
<span class=w> </span><span class=p>{</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=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=p>;</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=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=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>[json.exception.type_error.302] (/address/housenumber) type must be number, but is string
|
||||
@@ -88,52 +88,52 @@
|
||||
<span class=w> </span><span class=k>try</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>// parsing input with a syntax error</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=s>"[1,2,3,]"</span><span class=p>);</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=s>"[1,2,3,]"</span><span class=p>);</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=w> </span><span class=k>catch</span><span class=w> </span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>parse_error</span><span class=o>&</span><span class=w> </span><span class=n>e</span><span class=p>)</span>
|
||||
<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=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=n>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=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=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
|
||||
</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
|
||||
exception id: 101
|
||||
byte position of error: 8
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionparse_error101>json.exception.parse_error.101<a class=headerlink href=#jsonexceptionparse_error101 title="Permanent link">¶</a></h3> <p>This error indicates a syntax error while deserializing a <abbr title="JavaScript Object Notation">JSON</abbr> text. The error message describes that an unexpected token (character) was encountered, and the member <code>byte</code> indicates the error position.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <p>Input ended prematurely:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at 2: unexpected end of input; expected string literal
|
||||
</code></pre></div> <p>No input:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 1: attempting to parse an empty input; check that your input string or stream contains the expected JSON
|
||||
</code></pre></div> <p>Control character was not escaped:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid string: control character U+0009 (HT) must be escaped to \u0009 or \\; last read: '"<U+0009>'"
|
||||
</code></pre></div> <p>String was not closed:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid string: missing closing quote; last read: '"'
|
||||
</code></pre></div> <p>Invalid number format:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 3: syntax error while parsing value - invalid number; expected '+', '-', or digit after exponent; last read: '1E'
|
||||
</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> <p>Control character was not escaped:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid string: control character U+0009 (HT) must be escaped to \u0009 or \\; last read: '"<U+0009>'"
|
||||
</code></pre></div> <p>String was not closed:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 2: syntax error while parsing value - invalid string: missing closing quote; last read: '"'
|
||||
</code></pre></div> <p>Invalid number format:</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.101] parse error at line 1, column 3: syntax error while parsing value - invalid number; expected '+', '-', or digit after exponent; last read: '1E'
|
||||
</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="http://jsonlint.com">http://jsonlint.com</a> or a tool like <a href="https://stedolan.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 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'
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.105] parse error: operation 'copy' must have string member 'from'
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.105] parse error: operation value 'foo' is invalid
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionparse_error106>json.exception.parse_error.106<a class=headerlink href=#jsonexceptionparse_error106 title="Permanent link">¶</a></h3> <p>An array index in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer (<a href="https://tools.ietf.org/html/rfc6901"><abbr title="Request for Comments">RFC</abbr> 6901</a>) may be <code>0</code> or any number without a leading <code>0</code>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error107>json.exception.parse_error.107<a class=headerlink href=#jsonexceptionparse_error107 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Pointer must be a Unicode string containing a sequence of zero or more reference tokens, each prefixed by a <code>/</code> character.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'
|
||||
</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.</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> </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'
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.105] parse error: operation 'copy' must have string member 'from'
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.parse_error.105] parse error: operation value 'foo' is invalid
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptionparse_error106>json.exception.parse_error.106<a class=headerlink href=#jsonexceptionparse_error106 title="Permanent link">¶</a></h3> <p>An array index in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer (<a href="https://tools.ietf.org/html/rfc6901"><abbr title="Request for Comments">RFC</abbr> 6901</a>) may be <code>0</code> or any number without a leading <code>0</code>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionparse_error107>json.exception.parse_error.107<a class=headerlink href=#jsonexceptionparse_error107 title="Permanent link">¶</a></h3> <p>A <abbr title="JavaScript Object Notation">JSON</abbr> Pointer must be a Unicode string containing a sequence of zero or more reference tokens, each prefixed by a <code>/</code> character.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.parse_error.107] parse error at byte 1: JSON pointer must be empty or begin with '/' - was: 'foo'
|
||||
</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.</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> <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> <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> <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 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 9: syntax error while parsing CBOR value: negative integer overflow
|
||||
</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), or the string's length specification is invalid.</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 string: expected length specification (0x60-0x7B) or indefinite string type (0x7F); last byte: 0xFF
|
||||
</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 string: expected length specification (0xA0-0xBF, 0xD9-0xDB); last byte: 0xFF
|
||||
</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 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></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
|
||||
@@ -147,15 +147,15 @@ byte position of error: 8
|
||||
<span class=w> </span><span class=k>try</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>// calling iterator::key() on non-object iterator</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"string"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"string"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>iterator</span><span class=w> </span><span class=n>it</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>begin</span><span class=p>();</span>
|
||||
<span class=w> </span><span class=k>auto</span><span class=w> </span><span class=n>k</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>it</span><span class=p>.</span><span class=n>key</span><span class=p>();</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=w> </span><span class=k>catch</span><span class=w> </span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>invalid_iterator</span><span class=o>&</span><span class=w> </span><span class=n>e</span><span class=p>)</span>
|
||||
<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=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=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
|
||||
@@ -185,14 +185,14 @@ exception id: 207
|
||||
<span class=w> </span><span class=k>try</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>// calling push_back() on a string value</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"string"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>.</span><span class=n>push_back</span><span class=p>(</span><span class=s>"another string"</span><span class=p>);</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"string"</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>.</span><span class=n>push_back</span><span class=p>(</span><span class=s>"another string"</span><span class=p>);</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=w> </span><span class=k>catch</span><span class=w> </span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>type_error</span><span class=o>&</span><span class=w> </span><span class=n>e</span><span class=p>)</span>
|
||||
<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=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=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
|
||||
@@ -201,7 +201,7 @@ exception id: 308
|
||||
</code></pre></div> </div> <h3 id=jsonexceptiontype_error302>json.exception.type_error.302<a class=headerlink href=#jsonexceptiontype_error302 title="Permanent link">¶</a></h3> <p>During implicit or explicit value conversion, the <abbr title="JavaScript Object Notation">JSON</abbr> type must be compatible with the target type. For instance, a <abbr title="JavaScript Object Notation">JSON</abbr> string can only be converted into string types, but not into numbers or boolean types.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.type_error.302] type must be object, but is null
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.type_error.302] type must be string, but is object
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptiontype_error303>json.exception.type_error.303<a class=headerlink href=#jsonexceptiontype_error303 title="Permanent link">¶</a></h3> <p>To retrieve a reference to a value stored in a <code>basic_json</code> object with <code>get_ref</code>, the type of the reference must match the value type. For instance, for a <abbr title="JavaScript Object Notation">JSON</abbr> array, the <code>ReferenceType</code> must be <code>array_t &</code>.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is object
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number"
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.type_error.303] incompatible ReferenceType for get_ref, actual type is number"
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptiontype_error304>json.exception.type_error.304<a class=headerlink href=#jsonexceptiontype_error304 title="Permanent link">¶</a></h3> <p>The <code>at()</code> member functions can only be executed for certain <abbr title="JavaScript Object Notation">JSON</abbr> types.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.type_error.304] cannot use at() with string
|
||||
</code></pre></div> <div class=highlight><pre><span></span><code>[json.exception.type_error.304] cannot use at() with number
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptiontype_error305>json.exception.type_error.305<a class=headerlink href=#jsonexceptiontype_error305 title="Permanent link">¶</a></h3> <p>The <code>operator[]</code> member functions can only be executed for certain <abbr title="JavaScript Object Notation">JSON</abbr> types.</p> <div class="admonition failure"> <p class=admonition-title>Example messages</p> <p><div class=highlight><pre><span></span><code>[json.exception.type_error.305] cannot use operator[] with a string argument with array
|
||||
@@ -217,11 +217,11 @@ exception id: 308
|
||||
</code></pre></div></p> </div> <h3 id=jsonexceptiontype_error312>json.exception.type_error.312<a class=headerlink href=#jsonexceptiontype_error312 title="Permanent link">¶</a></h3> <p>The <code>update()</code> member functions can only be executed for certain <abbr title="JavaScript Object Notation">JSON</abbr> types.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>[json.exception.type_error.312] cannot use update() with array
|
||||
</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 <code>unflatten</code> 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 <code>unflatten</code> 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 <code>unflatten()</code> 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_error315>json.exception.type_error.315<a class=headerlink href=#jsonexceptiontype_error315 title="Permanent link">¶</a></h3> <p>The <code>unflatten()</code> 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 <code>dump()</code> 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.</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> </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> <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</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>
|
||||
</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> <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</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>
|
||||
@@ -237,25 +237,25 @@ exception id: 308
|
||||
<span class=w> </span><span class=k>catch</span><span class=w> </span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>out_of_range</span><span class=o>&</span><span class=w> </span><span class=n>e</span><span class=p>)</span>
|
||||
<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=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=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
|
||||
exception id: 401
|
||||
</code></pre></div> </details> <h3 id=jsonexceptionout_of_range401>json.exception.out_of_range.401<a class=headerlink href=#jsonexceptionout_of_range401 title="Permanent link">¶</a></h3> <p>The provided array index <code>i</code> is larger than <code>size-1</code>.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>array index 3 is out of range
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range402>json.exception.out_of_range.402<a class=headerlink href=#jsonexceptionout_of_range402 title="Permanent link">¶</a></h3> <p>The special array index <code>-</code> in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer never describes a valid element of the array, but the index past the end. That is, it can only be used to add elements at this position, but not to read it.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>array index '-' (3) is out of range
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range403>json.exception.out_of_range.403<a class=headerlink href=#jsonexceptionout_of_range403 title="Permanent link">¶</a></h3> <p>The provided key was not found in the <abbr title="JavaScript Object Notation">JSON</abbr> object.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>key 'foo' not found
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range404>json.exception.out_of_range.404<a class=headerlink href=#jsonexceptionout_of_range404 title="Permanent link">¶</a></h3> <p>A reference token in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer could not be resolved.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>unresolved reference token 'foo'
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range402>json.exception.out_of_range.402<a class=headerlink href=#jsonexceptionout_of_range402 title="Permanent link">¶</a></h3> <p>The special array index <code>-</code> in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer never describes a valid element of the array, but the index past the end. That is, it can only be used to add elements at this position, but not to read it.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>array index '-' (3) is out of range
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range403>json.exception.out_of_range.403<a class=headerlink href=#jsonexceptionout_of_range403 title="Permanent link">¶</a></h3> <p>The provided key was not found in the <abbr title="JavaScript Object Notation">JSON</abbr> object.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>key 'foo' not found
|
||||
</code></pre></div> </div> <h3 id=jsonexceptionout_of_range404>json.exception.out_of_range.404<a class=headerlink href=#jsonexceptionout_of_range404 title="Permanent link">¶</a></h3> <p>A reference token in a <abbr title="JavaScript Object Notation">JSON</abbr> Pointer could not be resolved.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>unresolved reference token 'foo'
|
||||
</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 'add' cannot be applied to the root element of the <abbr title="JavaScript Object Notation">JSON</abbr> value.</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 as without changing it to <abbr title="Not a Number">NaN</abbr> or INF.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>number overflow parsing '10E1000'
|
||||
</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 as without changing it to <abbr title="Not a Number">NaN</abbr> or INF.</p> <div class="admonition failure"> <p class=admonition-title>Example message</p> <div class=highlight><pre><span></span><code>number overflow parsing '10E1000'
|
||||
</code></pre></div> </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>This exception previously indicated that the <abbr title="Universal Binary JSON">UBJSON</abbr> and <abbr title="Binary JSON">BSON</abbr> binary formats did not support integer numbers greater than 9223372036854775807 due to limitations in the implemented mapping. However, these limitations have since been resolved, and this exception no longer occurs.</p> <div class="admonition success"> <p class=admonition-title>Exception cannot occur any more</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> </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> <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></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> <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. 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. 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 message</p> <div class=highlight><pre><span></span><code>BSON length 2147483661 exceeds maximum of 2147483647
|
||||
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>This exception was added in version 3.13.0. Before that, the 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.</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</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>
|
||||
@@ -268,26 +268,26 @@ array index 18446744073709551616 exceeds size_type
|
||||
<span class=w> </span><span class=k>try</span>
|
||||
<span class=w> </span><span class=p>{</span>
|
||||
<span class=w> </span><span class=c1>// executing a failing JSON Patch operation</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>value</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=sa>R</span><span class=s>"</span><span class=dl>(</span><span class=s>{</span>
|
||||
<span class=s> "best_biscuit": {</span>
|
||||
<span class=s> "name": "Oreo"</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>value</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=sa>R</span><span class=s>"</span><span class=dl>(</span><span class=s>{</span>
|
||||
<span class=s> "best_biscuit": {</span>
|
||||
<span class=s> "name": "Oreo"</span>
|
||||
<span class=s> }</span>
|
||||
<span class=s> }</span><span class=dl>)</span><span class=s>"</span><span class=n>_json</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>patch</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=sa>R</span><span class=s>"</span><span class=dl>(</span><span class=s>[{</span>
|
||||
<span class=s> "op": "test",</span>
|
||||
<span class=s> "path": "/best_biscuit/name",</span>
|
||||
<span class=s> "value": "Choco Leibniz"</span>
|
||||
<span class=s> }]</span><span class=dl>)</span><span class=s>"</span><span class=n>_json</span><span class=p>;</span>
|
||||
<span class=s> }</span><span class=dl>)</span><span class=s>"</span><span class=n>_json</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>patch</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=sa>R</span><span class=s>"</span><span class=dl>(</span><span class=s>[{</span>
|
||||
<span class=s> "op": "test",</span>
|
||||
<span class=s> "path": "/best_biscuit/name",</span>
|
||||
<span class=s> "value": "Choco Leibniz"</span>
|
||||
<span class=s> }]</span><span class=dl>)</span><span class=s>"</span><span class=n>_json</span><span class=p>;</span>
|
||||
<span class=w> </span><span class=n>value</span><span class=p>.</span><span class=n>patch</span><span class=p>(</span><span class=n>patch</span><span class=p>);</span>
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
<span class=w> </span><span class=k>catch</span><span class=w> </span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>other_error</span><span class=o>&</span><span class=w> </span><span class=n>e</span><span class=p>)</span>
|
||||
<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=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=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"}
|
||||
</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> <!-- 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="August 7, 2026 17:29:58 UTC">August 7, 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 - 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|
||||
</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> <!-- 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="August 19, 2026 18:19:47 UTC">August 19, 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 - 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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/faq/" rel="canonical"><link href=../license/ rel=prev><link href=../exceptions/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>FAQ - 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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</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>
|
||||
</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>
|
||||
</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>
|
||||
</code></pre></div> <p>for objects.</p> <div class="admonition tip"> <p class=admonition-title>Tip</p> <p>To avoid any confusion and ensure portable code, <strong>do not</strong> use brace initialization with the types <code>basic_json</code>, <code>json</code>, or <code>ordered_json</code> unless you want to create an object or array as shown in the examples above.</p> <p>To explicitly create a single-element array, use <code>json::array({value})</code>:</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=n>j</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>array</span><span class=p>({</span><span class=nb>true</span><span class=p>});</span><span class=w> </span><span class=c1>// [true]</span>
|
||||
</code></pre></div> </div> <p><strong>Opt-in copy semantics (since version 3.12.0)</strong></p> <p>If you define <code>JSON_BRACE_INIT_COPY_SEMANTICS</code> to <code>1</code> before including the library, single-element brace initialization is treated as copy/move instead of creating a single-element array:</p> <div class=highlight><pre><span></span><code><span class=cp>#define JSON_BRACE_INIT_COPY_SEMANTICS 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=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>This library does not support any feature that would jeopardize interoperability.</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>Only <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. These encodings are not supported when reading from files or other input containers.</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="https://nlohmann.github.io/json/classnlohmann_1_1basic__json_a50ec80b02d0f3f51130d4abb5d1cfdc5.html#a50ec80b02d0f3f51130d4abb5d1cfdc5"><code>dump()</code></a> may throw an exception unless <code>json::error_handler_t::replace</code> or <code>json::error_handler_t::ignore</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=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 assumes <abbr title="Unicode Transformation Format">UTF</abbr>-8 as encoding. To store a wide string, you need to change the encoding.</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=c1> // codecvt_utf8</span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><locale></span><span class=c1> // wstring_convert</span>
|
||||
<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>This library does not support any feature that would jeopardize interoperability.</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>Only <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. These encodings are not supported when reading from files or other input containers.</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="https://nlohmann.github.io/json/classnlohmann_1_1basic__json_a50ec80b02d0f3f51130d4abb5d1cfdc5.html#a50ec80b02d0f3f51130d4abb5d1cfdc5"><code>dump()</code></a> may throw an exception unless <code>json::error_handler_t::replace</code> or <code>json::error_handler_t::ignore</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=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 assumes <abbr title="Unicode Transformation Format">UTF</abbr>-8 as encoding. To store a wide string, you need to change the encoding.</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>
|
||||
|
||||
<span class=c1>// encoding function</span>
|
||||
<span class=n>std</span><span class=o>::</span><span class=n>string</span><span class=w> </span><span class=nf>to_utf8</span><span class=p>(</span><span class=n>std</span><span class=o>::</span><span class=n>wstring</span><span class=o>&</span><span class=w> </span><span class=n>wide_string</span><span class=p>)</span>
|
||||
@@ -19,19 +19,19 @@
|
||||
<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>std</span><span class=o>::</span><span class=n>wstring</span><span class=w> </span><span class=n>ws</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=sa>L</span><span class=s>"車B1234 こんにちは"</span><span class=p>;</span>
|
||||
<span class=n>std</span><span class=o>::</span><span class=n>wstring</span><span class=w> </span><span class=n>ws</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=sa>L</span><span class=s>"車B1234 こんにちは"</span><span class=p>;</span>
|
||||
|
||||
<span class=n>j</span><span class=p>[</span><span class=s>"original"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>ws</span><span class=p>;</span>
|
||||
<span class=n>j</span><span class=p>[</span><span class=s>"encoded"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>to_utf8</span><span class=p>(</span><span class=n>ws</span><span class=p>);</span>
|
||||
<span class=n>j</span><span class=p>[</span><span class=s>"original"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>ws</span><span class=p>;</span>
|
||||
<span class=n>j</span><span class=p>[</span><span class=s>"encoded"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>to_utf8</span><span class=p>(</span><span class=n>ws</span><span class=p>);</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=n>j</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>
|
||||
</code></pre></div> <p>The result is:</p> <div class=highlight><pre><span></span><code><span class=p>{</span>
|
||||
<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=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 4, 6, 7, and 2019-09) 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 uses <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) digits for serialization. This value is sufficient to guarantee roundtripping. If one uses more than this number of digits of precision, then string -> value -> string is not guaranteed to round-trip.</p> <div class="admonition quote"> <p class=admonition-title><a href="https://en.cppreference.com/w/cpp/types/numeric_limits/digits10">cppreference.com</a></p> <p>The value of <code>std::numeric_limits<T>::digits10</code> is the number of base-10 digits that can be represented by the type T without change, that is, any number with this many significant decimal digits can be converted to a value of type T and back to decimal form, without change due to rounding or overflow. </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 serialize data that came from the network?</li> <li>Is CVE-2024-34363 a vulnerability in this library?</li> </ul> </div> <p>Crashes reported against this library that stem from an uncaught <a href=../exceptions/#jsonexceptiontype_error316><code>type_error.316</code></a> while serializing unvalidated input (e.g., CVE-2024-34363) are a usage issue, not a library Line 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, 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>Android defaults to using very old compilers and C++ libraries. To fix this, add the following to your <code>Application.mk</code>. This will switch to the LLVM C++ library, the Clang compiler, and enable C++11 and other features disabled by default.</p> <div class=highlight><pre><span></span><code><span class=na>APP_STL</span><span class=w> </span><span class=o>:</span><span class=s>= c++_shared</span>
|
||||
<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, 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>Android defaults to using very old compilers and C++ libraries. To fix this, add the following to your <code>Application.mk</code>. This will switch to the LLVM C++ library, the Clang compiler, and enable C++11 and other features disabled by default.</p> <div class=highlight><pre><span></span><code><span class=na>APP_STL</span><span class=w> </span><span class=o>:</span><span class=s>= c++_shared</span>
|
||||
<span class=na>NDK_TOOLCHAIN_VERSION</span><span class=w> </span><span class=o>:</span><span class=s>= clang3.6</span>
|
||||
<span class=na>APP_CPPFLAGS +</span><span class=o>=</span><span class=w> </span><span class=s>-frtti -fexceptions</span>
|
||||
</code></pre></div> <p>The code compiles successfully with <a href="https://developer.android.com/ndk/index.html?hl=ml">Android <abbr title="Native Development Kit">NDK</abbr></a>, Revision 9 - 11 (and possibly later) and <a href="https://www.crystax.net/en/android/ndk">CrystaX's Android <abbr title="Native Development Kit">NDK</abbr></a> version 10.</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, see above to build with a newer environment. 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. For Android <abbr title="Native Development Kit">NDK</abbr> using <code>APP_STL := gnustl_static</code>, please refer to <a href="https://github.com/nlohmann/json/issues/219">this discussion</a>.</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="August 7, 2026 17:29:58 UTC">August 7, 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=Line truncated
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</code></pre></div> <p>The code compiles successfully with <a href="https://developer.android.com/ndk/index.html?hl=ml">Android <abbr title="Native Development Kit">NDK</abbr></a>, Revision 9 - 11 (and possibly later) and <a href="https://www.crystax.net/en/android/ndk">CrystaX's Android <abbr title="Native Development Kit">NDK</abbr></a> version 10.</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, see above to build with a newer environment. 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. For Android <abbr title="Native Development Kit">NDK</abbr> using <code>APP_STL := gnustl_static</code>, please refer to <a href="https://github.com/nlohmann/json/issues/219">this discussion</a>.</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="August 19, 2026 18:19:47 UTC">August 19, 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" titlLine 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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