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only as bytes are actually read, arrays reserve at most a fixed number of elements up front, and sizes that no
container can hold are rejected.
- **Memory is owned by values.** Each `basic_json` value owns its content, and there is no manual memory management in
user code. The destructor does not recurse, so destroying a deeply nested value does not exhaust the stack.
user code. The destructor recurses only over a bounded number of nesting levels and then continues without the call
stack, so destroying a deeply nested value does not exhaust the stack.
- **Bounded recursion.** The JSON parser and the binary readers keep their state in explicit stacks instead of
recursing per nesting level. Operations that walk a value, such as [`dump`](../api/basic_json/dump.md), copying,
comparison, hashing, [`merge_patch`](../api/basic_json/merge_patch.md), [`diff`](../api/basic_json/diff.md),
[`flatten`](../api/basic_json/flatten.md), and the binary writers, recurse only up to a fixed depth and continue with
an explicit stack below it. Applications that process untrusted input can limit its nesting depth with a
an explicit stack below it. The depth is 128 levels by default and can be changed with
[`JSON_RECURSION_DEPTH_LIMIT`](../api/macros/json_recursion_depth_limit.md), for example to run on a small stack.
Applications that process untrusted input can limit its nesting depth with a
[parser callback](../features/parsing/parser_callbacks.md).
- **Invariants are checked.** The class invariant (for instance, that the pointer for the stored type is never null) is
checked with runtime assertions throughout the test suite.
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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=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/community/assurance_case/" rel="canonical"><link href=../security_policy/ rel=prev><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.8.0"><title>Assurance case - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.57a0d79d.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.fb2fffe2.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link 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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=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/community/assurance_case/" rel="canonical"><link href=../security_policy/ rel=prev><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.8.0"><title>Assurance case - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.57a0d79d.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.fb2fffe2.min.css><link rel=stylesheet href=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link rel=stylesheet href=../../css/fig-pointer.css><link rel=stylesheet href=../../css/fig-charts.css><link rel=stylesheet href=../../css/fig-integration.css><link rel=stylesheet href=../../css/fig-macros.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=custom data-md-color-accent=custom> <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=#assurance-case class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header 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A[Untrusted input] --&gt; B[Parser]
A --&gt; C[SAX interface]
A --&gt; D[Binary readers]
B --&gt; E["Value tree (basic_json)"]
C --&gt; E
D --&gt; E
E --&gt; F[Trusted caller]</code></pre> <p class=nj-caption>The trust boundary: untrusted input enters on the left through the parser, the <abbr title="Simple API for XML">SAX</abbr> interface, or the binary readers, and only a value tree reaches the trusted caller on the right.</p> <h2 id=secure-design>Secure design<a class=headerlink href=#secure-design title="Permanent link">&para;</a></h2> <ul> <li><strong>Strict parsing.</strong> The parser accepts exactly the <abbr title="JavaScript Object Notation">JSON</abbr> grammar of <a href="https://datatracker.ietf.org/doc/html/rfc8259"><abbr title="Request for Comments">RFC</abbr> 8259</a>. Extensions such as <a href=../../features/comments/ >comments</a> and <a href=../../features/trailing_commas/ >trailing commas</a> must be enabled explicitly. Invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8 is rejected.</li> <li><strong>Errors are reported, not ignored.</strong> Malformed input results in a <a href=../../home/exceptions/#parse-errors><code>parse_error</code></a> with the byte position of the error. Binary readers do not trust announced sizes: strings and binary values grow only as bytes are actually read, arrays reserve at most a fixed number of elements up front, and sizes that no container can hold are rejected.</li> <li><strong>Memory is owned by values.</strong> Each <code>basic_json</code> value owns its content, and there is no manual memory management in user code. The destructor does not recurse, so destroying a deeply nested value does not exhaust the stack.</li> <li><strong>Bounded recursion.</strong> The <abbr title="JavaScript Object Notation">JSON</abbr> parser and the binary readers keep their state in explicit stacks instead of recursing per nesting level. Operations that walk a value, such as <a href=../../api/basic_json/dump/ ><code>dump</code></a>, copying, comparison, hashing, <a href=../../api/basic_json/merge_patch/ ><code>merge_patch</code></a>, <a href=../../api/basic_json/diff/ ><code>diff</code></a>, <a href=../../api/basic_json/flatten/ ><code>flatten</code></a>, and the binary writers, recurse only up to a fixed depth and continue with an explicit stack below it. Applications that process untrusted input can limit its nesting depth with a <a href=../../features/parsing/parser_callbacks/ >parser callback</a>.</li> <li><strong>Invariants are checked.</strong> The class invariant (for instance, that the pointer for the stored type is never null) is checked with runtime assertions throughout the test suite.</li> </ul> <h2 id=common-weaknesses>Common weaknesses<a class=headerlink href=#common-weaknesses title="Permanent link">&para;</a></h2> <p>The following table maps the relevant classes of the <a href="https://cwe.mitre.org">Common Weakness Enumeration</a> to the measures that counter them. The measures are described in detail in <a href=../quality_assurance/ >Quality assurance</a>.</p> <table> <thead> <tr> <th>Weakness</th> <th>Countermeasures</th> </tr> </thead> <tbody> <tr> <td>Out-of-bounds read/write (<a href="https://cwe.mitre.org/data/definitions/125.html">CWE-125</a>, <a href="https://cwe.mitre.org/data/definitions/787.html">CWE-787</a>)</td> <td>bounds checks on all reads from the input; AddressSanitizer and Valgrind on the test suite; OSS-Fuzz</td> </tr> <tr> <td>Integer overflow (<a href="https://cwe.mitre.org/data/definitions/190.html">CWE-190</a>)</td> <td>UndefinedBehaviorSanitizer with integer overflow detection; Clang-Tidy; Cppcheck</td> </tr> <tr> <td>Use after free, double free (<a href="https://cwe.mitre.org/data/definitions/416.html">CWE-416</a>, <a href="https://cwe.mitre.org/data/definitions/415.html">CWE-415</a>)</td> <td>ownership of all memory by values; AddressSanitizer and Valgrind; Clang Static Analyzer</td> </tr> <tr> <td>Memory leaks (<a href="https://cwe.mitre.org/data/definitions/401.html">CWE-401</a>)</td> <td>Valgrind (Memcheck) on the test suite</td> </tr> <tr> <td>Uncontrolled recursion (<a href="https://cwe.mitre.org/data/definitions/674.html">CWE-674</a>)</td> <td>iterative parser, binary readers, and destructor; bounded recursion in value operations; tests with deeply nested inputs</td> </tr> <tr> <td>Uncontrolled resource consumption (<a href="https://cwe.mitre.org/data/definitions/400.html">CWE-400</a>)</td> <td>allocations based on announced sizes are capped; OSS-Fuzz with memory limits</td> </tr> <tr> <td>Undefined behavior in general (<a href="https://cwe.mitre.org/data/definitions/758.html">CWE-758</a>)</td> <td>UndefinedBehaviorSanitizer; runtime assertions; Clang-Tidy, Cppcheck, Clang Static Analyzer, Infer</td> </tr> </tbody> </table> <p>In addition, every line of the library is covered by the unit tests, and all parsers are fuzz-tested around the clock by <a href="https://github.com/google/oss-fuzz/tree/master/projects/json">OSS-Fuzz</a>.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <sLine truncated
E --&gt; F[Trusted caller]</code></pre> <p class=nj-caption>The trust boundary: untrusted input enters on the left through the parser, the <abbr title="Simple API for XML">SAX</abbr> interface, or the binary readers, and only a value tree reaches the trusted caller on the right.</p> <h2 id=secure-design>Secure design<a class=headerlink href=#secure-design title="Permanent link">&para;</a></h2> <ul> <li><strong>Strict parsing.</strong> The parser accepts exactly the <abbr title="JavaScript Object Notation">JSON</abbr> grammar of <a href="https://datatracker.ietf.org/doc/html/rfc8259"><abbr title="Request for Comments">RFC</abbr> 8259</a>. Extensions such as <a href=../../features/comments/ >comments</a> and <a href=../../features/trailing_commas/ >trailing commas</a> must be enabled explicitly. Invalid <abbr title="Unicode Transformation Format">UTF</abbr>-8 is rejected.</li> <li><strong>Errors are reported, not ignored.</strong> Malformed input results in a <a href=../../home/exceptions/#parse-errors><code>parse_error</code></a> with the byte position of the error. Binary readers do not trust announced sizes: strings and binary values grow only as bytes are actually read, arrays reserve at most a fixed number of elements up front, and sizes that no container can hold are rejected.</li> <li><strong>Memory is owned by values.</strong> Each <code>basic_json</code> value owns its content, and there is no manual memory management in user code. The destructor recurses only over a bounded number of nesting levels and then continues without the call stack, so destroying a deeply nested value does not exhaust the stack.</li> <li><strong>Bounded recursion.</strong> The <abbr title="JavaScript Object Notation">JSON</abbr> parser and the binary readers keep their state in explicit stacks instead of recursing per nesting level. Operations that walk a value, such as <a href=../../api/basic_json/dump/ ><code>dump</code></a>, copying, comparison, hashing, <a href=../../api/basic_json/merge_patch/ ><code>merge_patch</code></a>, <a href=../../api/basic_json/diff/ ><code>diff</code></a>, <a href=../../api/basic_json/flatten/ ><code>flatten</code></a>, and the binary writers, recurse only up to a fixed depth and continue with an explicit stack below it. The depth is 128 levels by default and can be changed with <a href=../../api/macros/json_recursion_depth_limit/ ><code>JSON_RECURSION_DEPTH_LIMIT</code></a>, for example to run on a small stack. Applications that process untrusted input can limit its nesting depth with a <a href=../../features/parsing/parser_callbacks/ >parser callback</a>.</li> <li><strong>Invariants are checked.</strong> The class invariant (for instance, that the pointer for the stored type is never null) is checked with runtime assertions throughout the test suite.</li> </ul> <h2 id=common-weaknesses>Common weaknesses<a class=headerlink href=#common-weaknesses title="Permanent link">&para;</a></h2> <p>The following table maps the relevant classes of the <a href="https://cwe.mitre.org">Common Weakness Enumeration</a> to the measures that counter them. The measures are described in detail in <a href=../quality_assurance/ >Quality assurance</a>.</p> <table> <thead> <tr> <th>Weakness</th> <th>Countermeasures</th> </tr> </thead> <tbody> <tr> <td>Out-of-bounds read/write (<a href="https://cwe.mitre.org/data/definitions/125.html">CWE-125</a>, <a href="https://cwe.mitre.org/data/definitions/787.html">CWE-787</a>)</td> <td>bounds checks on all reads from the input; AddressSanitizer and Valgrind on the test suite; OSS-Fuzz</td> </tr> <tr> <td>Integer overflow (<a href="https://cwe.mitre.org/data/definitions/190.html">CWE-190</a>)</td> <td>UndefinedBehaviorSanitizer with integer overflow detection; Clang-Tidy; Cppcheck</td> </tr> <tr> <td>Use after free, double free (<a href="https://cwe.mitre.org/data/definitions/416.html">CWE-416</a>, <a href="https://cwe.mitre.org/data/definitions/415.html">CWE-415</a>)</td> <td>ownership of all memory by values; AddressSanitizer and Valgrind; Clang Static Analyzer</td> </tr> <tr> <td>Memory leaks (<a href="https://cwe.mitre.org/data/definitions/401.html">CWE-401</a>)</td> <td>Valgrind (Memcheck) on the test suite</td> </tr> <tr> <td>Uncontrolled recursion (<a href="https://cwe.mitre.org/data/definitions/674.html">CWE-674</a>)</td> <td>iterative parser, binary readers, and destructor; bounded recursion in value operations; tests with deeply nested inputs</td> </tr> <tr> <td>Uncontrolled resource consumption (<a href="https://cwe.mitre.org/data/definitions/400.html">CWE-400</a>)</td> <td>allocations based on announced sizes are capped; OSS-Fuzz with memory limits</td> </tr> <tr> <td>Undefined behavior in general (<a href="https://cwe.mitre.org/data/definitions/758.html">CWE-758</a>)</td> <td>UndefinedBehaviorSanitizer; runtime assertions; Clang-Tidy, Cppcheck, Clang Static Analyzer, Infer</td> </tr> </tbody> </table> <p>In addition, every line of the library is covered by the uLine truncated
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@@ -35,8 +35,8 @@ The trust boundary: untrusted input enters on the left through the parser, the S
- **Strict parsing.** The parser accepts exactly the JSON grammar of [RFC 8259](https://datatracker.ietf.org/doc/html/rfc8259). Extensions such as [comments](https://json.nlohmann.me/features/comments/index.md) and [trailing commas](https://json.nlohmann.me/features/trailing_commas/index.md) must be enabled explicitly. Invalid UTF-8 is rejected.
- **Errors are reported, not ignored.** Malformed input results in a [`parse_error`](https://json.nlohmann.me/home/exceptions/#parse-errors) with the byte position of the error. Binary readers do not trust announced sizes: strings and binary values grow only as bytes are actually read, arrays reserve at most a fixed number of elements up front, and sizes that no container can hold are rejected.
- **Memory is owned by values.** Each `basic_json` value owns its content, and there is no manual memory management in user code. The destructor does not recurse, so destroying a deeply nested value does not exhaust the stack.
- **Bounded recursion.** The JSON parser and the binary readers keep their state in explicit stacks instead of recursing per nesting level. Operations that walk a value, such as [`dump`](https://json.nlohmann.me/api/basic_json/dump/index.md), copying, comparison, hashing, [`merge_patch`](https://json.nlohmann.me/api/basic_json/merge_patch/index.md), [`diff`](https://json.nlohmann.me/api/basic_json/diff/index.md), [`flatten`](https://json.nlohmann.me/api/basic_json/flatten/index.md), and the binary writers, recurse only up to a fixed depth and continue with an explicit stack below it. Applications that process untrusted input can limit its nesting depth with a [parser callback](https://json.nlohmann.me/features/parsing/parser_callbacks/index.md).
- **Memory is owned by values.** Each `basic_json` value owns its content, and there is no manual memory management in user code. The destructor recurses only over a bounded number of nesting levels and then continues without the call stack, so destroying a deeply nested value does not exhaust the stack.
- **Bounded recursion.** The JSON parser and the binary readers keep their state in explicit stacks instead of recursing per nesting level. Operations that walk a value, such as [`dump`](https://json.nlohmann.me/api/basic_json/dump/index.md), copying, comparison, hashing, [`merge_patch`](https://json.nlohmann.me/api/basic_json/merge_patch/index.md), [`diff`](https://json.nlohmann.me/api/basic_json/diff/index.md), [`flatten`](https://json.nlohmann.me/api/basic_json/flatten/index.md), and the binary writers, recurse only up to a fixed depth and continue with an explicit stack below it. The depth is 128 levels by default and can be changed with [`JSON_RECURSION_DEPTH_LIMIT`](https://json.nlohmann.me/api/macros/json_recursion_depth_limit/index.md), for example to run on a small stack. Applications that process untrusted input can limit its nesting depth with a [parser callback](https://json.nlohmann.me/features/parsing/parser_callbacks/index.md).
- **Invariants are checked.** The class invariant (for instance, that the pointer for the stored type is never null) is checked with runtime assertions throughout the test suite.
## Common weaknesses
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$<span class=w> </span>cmake<span class=w> </span>--build<span class=w> </span>build<span class=w> </span>-j<span class=w> </span><span class=m>10</span>
$<span class=w> </span>ctest<span class=w> </span>--test-dir<span class=w> </span>build<span class=w> </span>-j<span class=w> </span><span class=m>10</span>
</code></pre></div> <p>The test suite should report:</p> <div class=highlight><pre><span></span><code>100% tests passed, 0 tests failed out of &lt;number of tests&gt;
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<span class=c># -Wno-c++98-compat The library targets C++11.</span>
<span class=c># -Wno-c++98-compat-pedantic The library targets C++11.</span>
<span class=c># -Wno-deprecated-declarations The library contains annotations for deprecated functions.</span>
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<span class=cp>#define JSON_USE_GLOBAL_UDLS 0</span>
<span class=cp>#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 0</span>
<span class=cp>#define JSON_BRACE_INIT_COPY_SEMANTICS 1</span>
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