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@@ -135,6 +135,31 @@ Enable CI build targets. The exact targets are used during the several CI steps
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Enable [extended diagnostic messages](../home/exceptions.md#extended-diagnostic-messages) by defining macro [`JSON_DIAGNOSTICS`](../api/macros/json_diagnostics.md). This option is `OFF` by default.
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!!! warning "Does not apply to a pre-installed package"
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This option only takes effect when building nlohmann/json from source as part of your own
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CMake project (e.g. via [`FetchContent`](#fetchcontent) or [`add_subdirectory`](#external)).
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It has **no effect** on a package that was already built and installed elsewhere (Homebrew,
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vcpkg, a system package, etc.) — the resulting compile definition is baked into the exported
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`nlohmann_jsonTargets.cmake` at install time, and `set(JSON_Diagnostics ON)` before
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`find_package()` does not change it (verified against the Homebrew-installed package: the
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exported target still carries a fixed `$<$<BOOL:OFF>:JSON_DIAGNOSTICS=1>`, regardless of any
|
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variable set in the consuming project).
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To enable extended diagnostics for a pre-installed package, override the imported target's
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property directly after `find_package()`:
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```cmake
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find_package(nlohmann_json REQUIRED)
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set_target_properties(nlohmann_json::nlohmann_json PROPERTIES
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INTERFACE_COMPILE_DEFINITIONS "JSON_DIAGNOSTICS=1")
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```
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||||
This only works cleanly when your project is the sole consumer of that imported target. If
|
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nlohmann_json is pulled in from more than one place in your dependency graph with different
|
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`JSON_DIAGNOSTICS` values, you may see a `"JSON_DIAGNOSTICS" redefined` compiler error, since
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conflicting `-D` flags can end up on the same compile command line.
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### `JSON_Diagnostic_Positions`
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Enable position diagnostics by defining macro [`JSON_DIAGNOSTIC_POSITIONS`](../api/macros/json_diagnostic_positions.md). This option is `OFF` by default.
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@@ -46,10 +46,13 @@
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<span class=w> </span><span class=s>GIT_REPOSITORY</span><span class=w> </span><span class=s>https://github.com/nlohmann/json</span>
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<span class=w> </span><span class=s>GIT_TAG</span><span class=w> </span><span class=s>v3.12.0</span>
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<span class=p>)</span>
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</code></pre></div> <p>However, the repository <a href="https://github.com/nlohmann/json">https://github.com/nlohmann/json</a> download size is quite large.</p> </div> <h2 id=cmake-options>CMake Options<a class=headerlink href=#cmake-options title="Permanent link">¶</a></h2> <h3 id=json_buildtests><code>JSON_BuildTests</code><a class=headerlink href=#json_buildtests title="Permanent link">¶</a></h3> <p>Build the unit tests when <a href="https://cmake.org/cmake/help/latest/command/enable_testing.html"><code>BUILD_TESTING</code></a> is enabled. This option is <code>ON</code> by default if the library's CMake project is the top project. That is, when integrating the library as described above, the test suite is not built unless explicitly switched on with this option.</p> <h3 id=json_ci><code>JSON_CI</code><a class=headerlink href=#json_ci title="Permanent link">¶</a></h3> <p>Enable <abbr title="Continuous Integration">CI</abbr> build targets. The exact targets are used during the several <abbr title="Continuous Integration">CI</abbr> steps and are subject to change without notice. This option is <code>OFF</code> by default.</p> <h3 id=json_diagnostics><code>JSON_Diagnostics</code><a class=headerlink href=#json_diagnostics title="Permanent link">¶</a></h3> <p>Enable <a href=../../home/exceptions/#extended-diagnostic-messages>extended diagnostic messages</a> by defining macro <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_diagnostic_positions><code>JSON_Diagnostic_Positions</code><a class=headerlink href=#json_diagnostic_positions title="Permanent link">¶</a></h3> <p>Enable position diagnostics by defining macro <a href=../../api/macros/json_diagnostic_positions/ ><code>JSON_DIAGNOSTIC_POSITIONS</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_disableenumserialization><code>JSON_DisableEnumSerialization</code><a class=headerlink href=#json_disableenumserialization title="Permanent link">¶</a></h3> <p>Disable default <code>enum</code> serialization by defining the macro <a href=../../api/macros/json_disable_enum_serialization/ ><code>JSON_DISABLE_ENUM_SERIALIZATION</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_fasttests><code>JSON_FastTests</code><a class=headerlink href=#json_fasttests title="Permanent link">¶</a></h3> <p>Skip expensive/slow test suites. This option is <code>OFF</code> by default. Depends on <code>JSON_BuildTests</code>.</p> <h3 id=json_globaludls><code>JSON_GlobalUDLs</code><a class=headerlink href=#json_globaludls title="Permanent link">¶</a></h3> <p>Place user-defined string literals in the global namespace by defining the macro <a href=../../api/macros/json_use_global_udls/ ><code>JSON_USE_GLOBAL_UDLS</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_implicitconversions><code>JSON_ImplicitConversions</code><a class=headerlink href=#json_implicitconversions title="Permanent link">¶</a></h3> <p>Enable implicit conversions by defining macro <a href=../../api/macros/json_use_implicit_conversions/ ><code>JSON_USE_IMPLICIT_CONVERSIONS</code></a>. This option is <code>ON</code> by default.</p> <h3 id=json_install><code>JSON_Install</code><a class=headerlink href=#json_install title="Permanent link">¶</a></h3> <p>Install CMake targets during install step. This option is <code>ON</code> by default if the library's CMake project is the top project.</p> <h3 id=json_legacydiscardedvaluecomparison><code>JSON_LegacyDiscardedValueComparison</code><a class=headerlink href=#json_legacydiscardedvaluecomparison title="Permanent link">¶</a></h3> <p>Enable the (incorrect) legacy comparison behavior of discarded <abbr title="JavaScript Object Notation">JSON</abbr> values by defining macro <a href=../../api/macros/json_use_legacy_discarded_value_comparison/ ><code>JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_multipleheaders><code>JSON_MultipleHeaders</code><a class=headerlink href=#json_multipleheaders title="Permanent link">¶</a></h3> <p>Use the non-amalgamated version of the library. This option is <code>ON</code> by default.</p> <h3 id=json_systeminclude><code>JSON_SystemInclude</code><a class=headerlink href=#json_systeminclude title="Permanent link">¶</a></h3> <p>Treat the library headers like system headers (i.e., adding <code>SYSTEM</code> to the <a href="https://cmake.org/cmake/help/latest/command/target_include_directories.html"><code>target_include_directories</code></a> call) to check for this library by tools like Clang-Tidy. This option is <code>OFF</code> by default.</p> <h3 id=json_valgrind><code>JSON_Valgrind</code><a class=headerlink href=#json_valgrind title="Permanent link">¶</a></h3> <p>Execute the test suite with <a href="https://valgrind.org">Valgrind</a>. This option is <code>OFF</code> by deLine truncated
|
||||
</code></pre></div> <p>However, the repository <a href="https://github.com/nlohmann/json">https://github.com/nlohmann/json</a> download size is quite large.</p> </div> <h2 id=cmake-options>CMake Options<a class=headerlink href=#cmake-options title="Permanent link">¶</a></h2> <h3 id=json_buildtests><code>JSON_BuildTests</code><a class=headerlink href=#json_buildtests title="Permanent link">¶</a></h3> <p>Build the unit tests when <a href="https://cmake.org/cmake/help/latest/command/enable_testing.html"><code>BUILD_TESTING</code></a> is enabled. This option is <code>ON</code> by default if the library's CMake project is the top project. That is, when integrating the library as described above, the test suite is not built unless explicitly switched on with this option.</p> <h3 id=json_ci><code>JSON_CI</code><a class=headerlink href=#json_ci title="Permanent link">¶</a></h3> <p>Enable <abbr title="Continuous Integration">CI</abbr> build targets. The exact targets are used during the several <abbr title="Continuous Integration">CI</abbr> steps and are subject to change without notice. This option is <code>OFF</code> by default.</p> <h3 id=json_diagnostics><code>JSON_Diagnostics</code><a class=headerlink href=#json_diagnostics title="Permanent link">¶</a></h3> <p>Enable <a href=../../home/exceptions/#extended-diagnostic-messages>extended diagnostic messages</a> by defining macro <a href=../../api/macros/json_diagnostics/ ><code>JSON_DIAGNOSTICS</code></a>. This option is <code>OFF</code> by default.</p> <div class="admonition warning"> <p class=admonition-title>Does not apply to a pre-installed package</p> <p>This option only takes effect when building nlohmann/json from source as part of your own CMake project (e.g. via <a href=#fetchcontent><code>FetchContent</code></a> or <a href=#external><code>add_subdirectory</code></a>). It has <strong>no effect</strong> on a package that was already built and installed elsewhere (Homebrew, vcpkg, a system package, etc.) — the resulting compile definition is baked into the exported <code>nlohmann_jsonTargets.cmake</code> at install time, and <code>set(JSON_Diagnostics ON)</code> before <code>find_package()</code> does not change it (verified against the Homebrew-installed package: the exported target still carries a fixed <code>$<$<BOOL:OFF>:JSON_DIAGNOSTICS=1></code>, regardless of any variable set in the consuming project).</p> <p>To enable extended diagnostics for a pre-installed package, override the imported target's property directly after <code>find_package()</code>:</p> <div class=highlight><pre><span></span><code><span class=nb>find_package</span><span class=p>(</span><span class=s>nlohmann_json</span><span class=w> </span><span class=s>REQUIRED</span><span class=p>)</span>
|
||||
<span class=nb>set_target_properties</span><span class=p>(</span><span class=s>nlohmann_json::nlohmann_json</span><span class=w> </span><span class=s>PROPERTIES</span>
|
||||
<span class=w> </span><span class=s>INTERFACE_COMPILE_DEFINITIONS</span><span class=w> </span><span class=s2>"JSON_DIAGNOSTICS=1"</span><span class=p>)</span>
|
||||
</code></pre></div> <p>This only works cleanly when your project is the sole consumer of that imported target. If nlohmann_json is pulled in from more than one place in your dependency graph with different <code>JSON_DIAGNOSTICS</code> values, you may see a <code>"JSON_DIAGNOSTICS" redefined</code> compiler error, since conflicting <code>-D</code> flags can end up on the same compile command line.</p> </div> <h3 id=json_diagnostic_positions><code>JSON_Diagnostic_Positions</code><a class=headerlink href=#json_diagnostic_positions title="Permanent link">¶</a></h3> <p>Enable position diagnostics by defining macro <a href=../../api/macros/json_diagnostic_positions/ ><code>JSON_DIAGNOSTIC_POSITIONS</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_disableenumserialization><code>JSON_DisableEnumSerialization</code><a class=headerlink href=#json_disableenumserialization title="Permanent link">¶</a></h3> <p>Disable default <code>enum</code> serialization by defining the macro <a href=../../api/macros/json_disable_enum_serialization/ ><code>JSON_DISABLE_ENUM_SERIALIZATION</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_fasttests><code>JSON_FastTests</code><a class=headerlink href=#json_fasttests title="Permanent link">¶</a></h3> <p>Skip expensive/slow test suites. This option is <code>OFF</code> by default. Depends on <code>JSON_BuildTests</code>.</p> <h3 id=json_globaludls><code>JSON_GlobalUDLs</code><a class=headerlink href=#json_globaludls title="Permanent link">¶</a></h3> <p>Place user-defined string literals in the global namespace by defining the macro <a href=../../api/macros/json_use_global_udls/ ><code>JSON_USE_GLOBAL_UDLS</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_implicitconversions><code>JSON_ImplicitConversions</code><a class=headerlink href=#json_implicitconversions title="Permanent link">¶</a></h3> <p>Enable implicit conversions by defining macro <a href=../../api/macros/json_use_implicit_conversions/ ><code>JSON_USE_IMPLICIT_CONVERSIONS</code></a>. This option is <code>ON</code> by default.</p> <h3 id=json_install><code>JSON_Install</code><a class=headerlink href=#json_install title="Permanent link">¶</a></h3> <p>Install CMake targets during install step. This option is <code>ON</code> by default if the library's CMake project is the top project.</p> <h3 id=json_legacydiscardedvaluecomparison><code>JSON_LegacyDiscardedValueComparison</code><a class=headerlink href=#json_legacydiscardedvaluecomparison title="Permanent link">¶</a></h3> <p>Enable the (incorrect) legacy comparison behavior of discarded <abbr title="JavaScript Object Notation">JSON</abbr> values by defining macro <a href=../../api/macros/json_use_legacy_discarded_value_comparison/ ><code>JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON</code></a>. This option is <code>OFF</code> by default.</p> <h3 id=json_multipleheaders><code>JSON_MultipleHeaders</code><a class=headerlink href=#json_multipleheaders title="Permanent link">¶</a></h3> <p>Use the non-amalgamated version of the library. This option is <code>ON</code> by default.</p> <h3 id=json_systeminclude><code>JSON_SystemInclude</code><a class=headerlink href=#json_systeminclude title="Permanent link">¶</a></h3> <p>Treat the library headers like system headers (i.e., adding <code>SYSTEM</code> to the <a href="https://cmake.org/cmake/help/latest/command/target_include_directories.html"><code>target_include_directories</code></a> call) to check for this library by tools like Clang-Tidy. This option is <code>OFF</code> by default.</p> <h3 id=json_valgrind><code>JSON_Valgrind</code><a class=headerlink href=#json_valgrind title="Permanent link">¶</a></h3> <p>Execute the test suite with <a href="https://valgrind.org">Valgrind</a>. This option is <code>OFF</code> by default. Depends on <code>JSON_BuildTests</code>.</p> <h3 id=nlohmann_json_build_modules><code>NLOHMANN_JSON_BUILD_MODULES</code><a class=headerlink href=#nlohmann_json_build_modules title="Permanent link">¶</a></h3> <p>Build the experimental <a href=../../features/modules/ >C++ module</a> <code>nlohmann.json</code> (requires CMake 3.28 or later and C++20). This option is <code>OFF</code> by default.</p> <p>A consuming project must link the dedicated <code>nlohmann_json_modules</code> CMake target (not just <code>nlohmann_json::nlohmann_json</code>) for <code>import nlohmann.json;</code> to resolve:</p> <div class=highlight><pre><span></span><code><span class=nb>set</span><span class=p>(</span><span class=s>NLOHMANN_JSON_BUILD_MODULES</span><span class=w> </span><span class=s>ON</span><span class=p>)</span>
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<span class=nb>add_subdirectory</span><span class=p>(</span><span class=s>path/to/json</span><span class=p>)</span>
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<span class=nb>add_executable</span><span class=p>(</span><span class=s>myproject</span><span class=w> </span><span class=s>main.cpp</span><span class=p>)</span>
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||||
<span class=nb>target_link_libraries</span><span class=p>(</span><span class=s>myproject</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>nlohmann_json_modules</span><span class=p>)</span>
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||||
<span class=nb>target_compile_definitions</span><span class=p>(</span><span class=s>myproject</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>NLOHMANN_JSON_BUILD_MODULES</span><span class=p>)</span>
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</code></pre></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="July 11, 2026 13:09:28 UTC">July 11, 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> <!-- 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="July 11, 2026 21:58:18 UTC">July 11, 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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|
||||
@@ -132,6 +132,20 @@ Enable CI build targets. The exact targets are used during the several CI steps
|
||||
|
||||
Enable [extended diagnostic messages](https://json.nlohmann.me/home/exceptions/#extended-diagnostic-messages) by defining macro [`JSON_DIAGNOSTICS`](https://json.nlohmann.me/api/macros/json_diagnostics/index.md). This option is `OFF` by default.
|
||||
|
||||
Does not apply to a pre-installed package
|
||||
|
||||
This option only takes effect when building nlohmann/json from source as part of your own CMake project (e.g. via [`FetchContent`](#fetchcontent) or [`add_subdirectory`](#external)). It has **no effect** on a package that was already built and installed elsewhere (Homebrew, vcpkg, a system package, etc.) — the resulting compile definition is baked into the exported `nlohmann_jsonTargets.cmake` at install time, and `set(JSON_Diagnostics ON)` before `find_package()` does not change it (verified against the Homebrew-installed package: the exported target still carries a fixed `$<$<BOOL:OFF>:JSON_DIAGNOSTICS=1>`, regardless of any variable set in the consuming project).
|
||||
|
||||
To enable extended diagnostics for a pre-installed package, override the imported target's property directly after `find_package()`:
|
||||
|
||||
```
|
||||
find_package(nlohmann_json REQUIRED)
|
||||
set_target_properties(nlohmann_json::nlohmann_json PROPERTIES
|
||||
INTERFACE_COMPILE_DEFINITIONS "JSON_DIAGNOSTICS=1")
|
||||
```
|
||||
|
||||
This only works cleanly when your project is the sole consumer of that imported target. If nlohmann_json is pulled in from more than one place in your dependency graph with different `JSON_DIAGNOSTICS` values, you may see a `"JSON_DIAGNOSTICS" redefined` compiler error, since conflicting `-D` flags can end up on the same compile command line.
|
||||
|
||||
### `JSON_Diagnostic_Positions`
|
||||
|
||||
Enable position diagnostics by defining macro [`JSON_DIAGNOSTIC_POSITIONS`](https://json.nlohmann.me/api/macros/json_diagnostic_positions/index.md). This option is `OFF` by default.
|
||||
|
||||
@@ -2,4 +2,4 @@
|
||||
|
||||
<span class=c1>// for convenience</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>
|
||||
</code></pre></div> <p>to the files you want to process <abbr title="JavaScript Object Notation">JSON</abbr> and set the necessary switches to enable C++11 (e.g., <code>-std=c++11</code> for <abbr title="GNU Compiler Collection">GCC</abbr> and Clang).</p> <p>You can further use file <a href="https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json_fwd.hpp"><code>single_include/nlohmann/json_fwd.hpp</code></a> for forward declarations.</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="July 11, 2026 13:09:28 UTC">July 11, 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> <p>to the files you want to process <abbr title="JavaScript Object Notation">JSON</abbr> and set the necessary switches to enable C++11 (e.g., <code>-std=c++11</code> for <abbr title="GNU Compiler Collection">GCC</abbr> and Clang).</p> <p>You can further use file <a href="https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json_fwd.hpp"><code>single_include/nlohmann/json_fwd.hpp</code></a> for forward declarations.</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="July 11, 2026 21:58:18 UTC">July 11, 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 License - https://fonLine truncated
|
||||
@@ -54,4 +54,4 @@
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"age"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>p</span><span class=p>.</span><span class=n>age</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> </div> </div> </div> <h2 id=do-not-use-the-details-namespace>Do not use the <code>details</code> namespace<a class=headerlink href=#do-not-use-the-details-namespace title="Permanent link">¶</a></h2> <p>The <code>details</code> namespace is not part of the public <abbr title="Application Programming Interfaces">API</abbr> of the library and can change in any version without an announcement. Do not rely on any function or type in the <code>details</code> namespace.</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="July 11, 2026 13:09:28 UTC">July 11, 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://fLine truncated
|
||||
</code></pre></div> </div> </div> </div> <h2 id=do-not-use-the-details-namespace>Do not use the <code>details</code> namespace<a class=headerlink href=#do-not-use-the-details-namespace title="Permanent link">¶</a></h2> <p>The <code>details</code> namespace is not part of the public <abbr title="Application Programming Interfaces">API</abbr> of the library and can change in any version without an announcement. Do not rely on any function or type in the <code>details</code> namespace.</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="July 11, 2026 21:58:18 UTC">July 11, 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://fLine truncated
|
||||
@@ -416,4 +416,4 @@ cmake<span class=w> </span>--build<span class=w> </span>build
|
||||
<span class=w> </span><span class=nf>set_languages</span><span class=p>(</span><span class=s2>"cxx11"</span><span class=p>)</span>
|
||||
</code></pre></div> </li> <li> <p>Build</p> <div class=highlight><pre><span></span><code>xmake
|
||||
</code></pre></div> </li> <li> <p>Run</p> <div class=highlight><pre><span></span><code>xmake<span class=w> </span>run
|
||||
</code></pre></div> </li> </ol> </details> <hr> <h2 id=other-package-managers>Other package managers<a class=headerlink href=#other-package-managers title="Permanent link">¶</a></h2> <p>The library is also contained in many other package repositories: <a href="https://repology.org/project/nlohmann-json/versions"><img alt="Packaging status" src="../../assets/external/repology.org/badge/tiny-repos/nlohmann-json.svg"></a></p> <details class=example> <summary>Package version overview</summary> <p><a href="https://repology.org/project/nlohmann-json/versions"><img alt="Packaging status" src="../../assets/external/repology.org/badge/vertical-allrepos/nlohmann-json.svg"></a></p> </details> <hr> <h2 id=buckaroo>Buckaroo<a class=headerlink href=#buckaroo title="Permanent link">¶</a></h2> <p>If you are using <a href="https://buckaroo.pm">Buckaroo</a>, you can install this library's module with <code>buckaroo add github.com/buckaroo-pm/nlohmann-json</code>. There is a demo repo <a href="https://github.com/njlr/buckaroo-nholmann-json-example">here</a>.</p> <div class="admonition warning"> <p class=admonition-title>Warning</p> <p>The module is outdated as the respective <a href="https://github.com/buckaroo-pm/nlohmann-json">repository</a> has not been updated in years.</p> </div> <h2 id=cocoapods>CocoaPods<a class=headerlink href=#cocoapods title="Permanent link">¶</a></h2> <p>If you are using <a href="https://cocoapods.org">CocoaPods</a>, you can use the library by adding pod <code>"nlohmann_json", '~>3.1.2'</code> to your podfile (see <a href="https://bitbucket.org/benman/nlohmann_json-cocoapod/src/master/">an example</a>). Please file issues <a href="https://bitbucket.org/benman/nlohmann_json-cocoapod/issues?status=new&status=open">here</a>.</p> <h2 id=esp-idf-and-platformio>ESP-IDF and PlatformIO<a class=headerlink href=#esp-idf-and-platformio title="Permanent link">¶</a></h2> <p>There is no official package published to the <a href="https://components.espressif.com">ESP-IDF Component Registry</a> or the <a href="https://registry.platformio.org">PlatformIO Registry</a>. A community-maintained fork, <a href="https://github.com/Johboh/nlohmann-json">Johboh/nlohmann-json</a>, publishes this library to both registries on each new release and can be used as an unofficial component/package for ESP-IDF and PlatformIO projects. As the library is header-only, it can otherwise be used directly by adding its <code>include/</code> directory to your component's/project's include paths, like any other integration method described on this page.</p> <p><img alt src="../../assets/external/img.shields.io/cocoapods/v/nlohmann_json.svg"></p> <div class="admonition warning"> <p class=admonition-title>Warning</p> <p>The module is outdated as the respective <a href="https://cocoapods.org/pods/nlohmann_json">pod</a> has not been updated in years.</p> </div> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="July 11, 2026 13:09:28 UTC">July 11, 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 Line truncated
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</code></pre></div> </li> </ol> </details> <hr> <h2 id=other-package-managers>Other package managers<a class=headerlink href=#other-package-managers title="Permanent link">¶</a></h2> <p>The library is also contained in many other package repositories: <a href="https://repology.org/project/nlohmann-json/versions"><img alt="Packaging status" src="../../assets/external/repology.org/badge/tiny-repos/nlohmann-json.svg"></a></p> <details class=example> <summary>Package version overview</summary> <p><a href="https://repology.org/project/nlohmann-json/versions"><img alt="Packaging status" src="../../assets/external/repology.org/badge/vertical-allrepos/nlohmann-json.svg"></a></p> </details> <hr> <h2 id=buckaroo>Buckaroo<a class=headerlink href=#buckaroo title="Permanent link">¶</a></h2> <p>If you are using <a href="https://buckaroo.pm">Buckaroo</a>, you can install this library's module with <code>buckaroo add github.com/buckaroo-pm/nlohmann-json</code>. There is a demo repo <a href="https://github.com/njlr/buckaroo-nholmann-json-example">here</a>.</p> <div class="admonition warning"> <p class=admonition-title>Warning</p> <p>The module is outdated as the respective <a href="https://github.com/buckaroo-pm/nlohmann-json">repository</a> has not been updated in years.</p> </div> <h2 id=cocoapods>CocoaPods<a class=headerlink href=#cocoapods title="Permanent link">¶</a></h2> <p>If you are using <a href="https://cocoapods.org">CocoaPods</a>, you can use the library by adding pod <code>"nlohmann_json", '~>3.1.2'</code> to your podfile (see <a href="https://bitbucket.org/benman/nlohmann_json-cocoapod/src/master/">an example</a>). Please file issues <a href="https://bitbucket.org/benman/nlohmann_json-cocoapod/issues?status=new&status=open">here</a>.</p> <h2 id=esp-idf-and-platformio>ESP-IDF and PlatformIO<a class=headerlink href=#esp-idf-and-platformio title="Permanent link">¶</a></h2> <p>There is no official package published to the <a href="https://components.espressif.com">ESP-IDF Component Registry</a> or the <a href="https://registry.platformio.org">PlatformIO Registry</a>. A community-maintained fork, <a href="https://github.com/Johboh/nlohmann-json">Johboh/nlohmann-json</a>, publishes this library to both registries on each new release and can be used as an unofficial component/package for ESP-IDF and PlatformIO projects. As the library is header-only, it can otherwise be used directly by adding its <code>include/</code> directory to your component's/project's include paths, like any other integration method described on this page.</p> <p><img alt src="../../assets/external/img.shields.io/cocoapods/v/nlohmann_json.svg"></p> <div class="admonition warning"> <p class=admonition-title>Warning</p> <p>The module is outdated as the respective <a href="https://cocoapods.org/pods/nlohmann_json">pod</a> has not been updated in years.</p> </div> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="July 11, 2026 21:58:18 UTC">July 11, 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 Line truncated
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@@ -1,3 +1,3 @@
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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/integration/pkg-config/" rel="canonical"><link href=../package_managers/ rel=prev><link href=../../api/basic_json/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.6"><title>Pkg-config - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.484c7ddc.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg> </label> <div cLine truncated
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</code></pre></div> <p>Users of the <a href=../package_managers/#meson>Meson build system</a> will also be able to use a system-wide library, which will be found by <code>pkg-config</code>:</p> <div class=highlight><pre><span></span><code><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=nb>dependency</span><span class=p>(</span><span class=s>'nlohmann_json'</span><span class=p>,</span><span class=w> </span><span class=n>required</span><span class=p>:</span><span class=w> </span><span class=kc>true</span><span class=p>)</span>
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</code></pre></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="July 11, 2026 13:09:28 UTC">July 11, 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> <!-- 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="July 11, 2026 21:58:18 UTC">July 11, 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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