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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/cmake/ rel=canonical><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.4.2, mkdocs-material-8.5.10"><title>CMake - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.975780f9.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.2505c338.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><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> <script>var palette=__md_get("__palette");if(palette&&"object"==typeof palette.color)for(var key of Object.keys(palette.color))document.body.setAttribute("data-md-color-"+key,palette.color[key])</script> <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=#cmake 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 3.54Z"/></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 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z"/></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> CMake </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option 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data-md-component=search-query required> <label class="md-search__icon md-icon" for=__search> <svg Line truncated
<span class=nb>project</span><span class=p>(</span><span class=s>ExampleProject</span><span class=w> </span><span class=s>LANGUAGES</span><span class=w> </span><span class=s>CXX</span><span class=p>)</span>
<span class=nb>find_package</span><span class=p>(</span><span class=s>nlohmann_json</span><span class=w> </span><span class=s>3.11.2</span><span class=w> </span><span class=s>REQUIRED</span><span class=p>)</span>
<span class=nb>add_executable</span><span class=p>(</span><span class=s>example</span><span class=w> </span><span class=s>example.cpp</span><span class=p>)</span>
<span class=nb>target_link_libraries</span><span class=p>(</span><span class=s>example</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>nlohmann_json::nlohmann_json</span><span class=p>)</span>
</code></pre></div> </div> <p>The package configuration file, <code>nlohmann_jsonConfig.cmake</code>, can be used either from an install tree or directly out of the build tree.</p> <h3 id=embedded>Embedded<a class=headerlink href=#embedded title="Permanent link">&para;</a></h3> <p>To embed the library directly into an existing CMake project, place the entire source tree in a subdirectory and call <code>add_subdirectory()</code> in your <code>CMakeLists.txt</code> file.</p> <div class="admonition example"> <p class=admonition-title>Example</p> <div class=highlight><span class=filename>CMakeLists.txt</span><pre><span></span><code><span class=nb>cmake_minimum_required</span><span class=p>(</span><span class=s>VERSION</span><span class=w> </span><span class=s>3.1</span><span class=p>)</span>
<span class=nb>project</span><span class=p>(</span><span class=s>ExampleProject</span><span class=w> </span><span class=s>LANGUAGES</span><span class=w> </span><span class=s>CXX</span><span class=p>)</span>
<span class=c># If you only include this third party in PRIVATE source files, you do not need to install it</span>
<span class=c># when your main project gets installed.</span>
<span class=nb>set</span><span class=p>(</span><span class=s>JSON_Install</span><span class=w> </span><span class=s>OFF</span><span class=w> </span><span class=s>CACHE</span><span class=w> </span><span class=s>INTERNAL</span><span class=w> </span><span class=s2>&quot;&quot;</span><span class=p>)</span>
<span class=nb>add_subdirectory</span><span class=p>(</span><span class=s>nlohmann_json</span><span class=p>)</span>
<span class=nb>add_executable</span><span class=p>(</span><span class=s>example</span><span class=w> </span><span class=s>example.cpp</span><span class=p>)</span>
<span class=nb>target_link_libraries</span><span class=p>(</span><span class=s>example</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>nlohmann_json::nlohmann_json</span><span class=p>)</span>
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>Do not use <code class=highlight><span class=nb>include</span><span class=p>(</span><span class=s>nlohmann_json/CMakeLists.txt</span><span class=p>)</span></code>, since that carries with it unintended consequences that will break the build. It is generally discouraged (although not necessarily well documented as such) to use <code class=highlight><span class=nb>include</span><span class=p>(</span><span class=s>...</span><span class=p>)</span></code> for pulling in other CMake projects anyways.</p> </div> <h3 id=supporting-both>Supporting Both<a class=headerlink href=#supporting-both title="Permanent link">&para;</a></h3> <p>To allow your project to support either an externally supplied or an embedded JSON library, you can use a pattern akin to the following.</p> <div class="admonition example"> <p class=admonition-title>Example</p> <div class=highlight><span class=filename>CMakeLists.txt</span><pre><span></span><code><span class=nb>project</span><span class=p>(</span><span class=s>ExampleProject</span><span class=w> </span><span class=s>LANGUAGES</span><span class=w> </span><span class=s>CXX</span><span class=p>)</span>
<span class=nb>option</span><span class=p>(</span><span class=s>EXAMPLE_USE_EXTERNAL_JSON</span><span class=w> </span><span class=s2>&quot;Use an external JSON library&quot;</span><span class=w> </span><span class=s>OFF</span><span class=p>)</span>
<span class=nb>add_subdirectory</span><span class=p>(</span><span class=s>thirdparty</span><span class=p>)</span>
<span class=nb>add_executable</span><span class=p>(</span><span class=s>example</span><span class=w> </span><span class=s>example.cpp</span><span class=p>)</span>
<span class=c># Note that the namespaced target will always be available regardless of the import method</span>
<span class=nb>target_link_libraries</span><span class=p>(</span><span class=s>example</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>nlohmann_json::nlohmann_json</span><span class=p>)</span>
</code></pre></div> <div class=highlight><span class=filename>thirdparty/CMakeLists.txt</span><pre><span></span><code><span class=nb>if</span><span class=p>(</span><span class=s>EXAMPLE_USE_EXTERNAL_JSON</span><span class=p>)</span>
<span class=w> </span><span class=nb>find_package</span><span class=p>(</span><span class=s>nlohmann_json</span><span class=w> </span><span class=s>3.11.2</span><span class=w> </span><span class=s>REQUIRED</span><span class=p>)</span>
<span class=nb>else</span><span class=p>()</span>
<span class=w> </span><span class=nb>set</span><span class=p>(</span><span class=s>JSON_BuildTests</span><span class=w> </span><span class=s>OFF</span><span class=w> </span><span class=s>CACHE</span><span class=w> </span><span class=s>INTERNAL</span><span class=w> </span><span class=s2>&quot;&quot;</span><span class=p>)</span>
<span class=w> </span><span class=nb>add_subdirectory</span><span class=p>(</span><span class=s>nlohmann_json</span><span class=p>)</span>
<span class=nb>endif</span><span class=p>()</span>
</code></pre></div> <p><code>thirdparty/nlohmann_json</code> is then a complete copy of this source tree.</p> </div> <h3 id=fetchcontent>FetchContent<a class=headerlink href=#fetchcontent title="Permanent link">&para;</a></h3> <p>Since CMake v3.11, <a href=https://cmake.org/cmake/help/v3.11/module/FetchContent.html>FetchContent</a> can be used to automatically download a release as a dependency at configure type.</p> <div class="admonition example"> <p class=admonition-title>Example</p> <div class=highlight><span class=filename>CMakeLists.txt</span><pre><span></span><code><span class=nb>cmake_minimum_required</span><span class=p>(</span><span class=s>VERSION</span><span class=w> </span><span class=s>3.11</span><span class=p>)</span>
<span class=nb>project</span><span class=p>(</span><span class=s>ExampleProject</span><span class=w> </span><span class=s>LANGUAGES</span><span class=w> </span><span class=s>CXX</span><span class=p>)</span>
<span class=nb>include</span><span class=p>(</span><span class=s>FetchContent</span><span class=p>)</span>
<span class=nb>FetchContent_Declare</span><span class=p>(</span><span class=s>json</span><span class=w> </span><span class=s>URL</span><span class=w> </span><span class=s>https://github.com/nlohmann/json/releases/download/v3.11.2/json.tar.xz</span><span class=p>)</span>
<span class=nb>FetchContent_MakeAvailable</span><span class=p>(</span><span class=s>json</span><span class=p>)</span>
<span class=nb>add_executable</span><span class=p>(</span><span class=s>example</span><span class=w> </span><span class=s>example.cpp</span><span class=p>)</span>
<span class=nb>target_link_libraries</span><span class=p>(</span><span class=s>example</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>nlohmann_json::nlohmann_json</span><span class=p>)</span>
</code></pre></div> </div> <div class="admonition note"> <p class=admonition-title>Note</p> <p>It is recommended to use the URL approach described above which is supported as of version 3.10.0. It is also possible to pass the Git repository like</p> <div class=highlight><pre><span></span><code><span class=nb>FetchContent_Declare</span><span class=p>(</span><span class=s>json</span>
<span class=w> </span><span class=s>GIT_REPOSITORY</span><span class=w> </span><span class=s>https://github.com/nlohmann/json</span>
<span class=w> </span><span class=s>GIT_TAG</span><span class=w> </span><span class=s>v3.11.2</span>
<span class=p>)</span>
</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. You might want to depend on a smaller repository. For instance, you might want to replace the URL in the example by <a href=https://github.com/ArthurSonzogni/nlohmann_json_cmake_fetchcontent>https://github.com/ArthurSonzogni/nlohmann_json_cmake_fetchcontent</a>.</p> </div> <h2 id=cmake-options>CMake Options<a class=headerlink href=#cmake-options title="Permanent link">&para;</a></h2> <h3 id=json_buildtests><code>JSON_BuildTests</code><a class=headerlink href=#json_buildtests title="Permanent link">&para;</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">&para;</a></h3> <p>Enable CI build targets. The exact targets are used during the several CI 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">&para;</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_disableenumserialization><code>JSON_DisableEnumSerialization</code><a class=headerlink href=#json_disableenumserialization title="Permanent link">&para;</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">&para;</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">&para;</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">&para;</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">&para;</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_multipleheaders><code>JSON_MultipleHeaders</code><a class=headerlink href=#json_multipleheaders title="Permanent link">&para;</a></h3> <p>Use non-amalgamated version of the library. This option is <code>OFF</code> by default.</p> <h3 id=json_systeminclude><code>JSON_SystemInclude</code><a class=headerlink href=#json_systeminclude title="Permanent link">&para;</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 checks 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">&para;</a></h3> <p>Execute 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> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 8, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/20Line truncated
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project(json_example)
cmake_minimum_required(VERSION 2.8.12)
add_definitions("-std=c++11")
include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
conan_basic_setup()
add_executable(json_example example.cpp)
target_link_libraries(json_example ${CONAN_LIBS})
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[requires]
nlohmann_json/3.7.3
[generators]
cmake
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#include <nlohmann/json.hpp>
#include <iostream>
using json = nlohmann::json;
int main()
{
std::cout << json::meta() << std::endl;
}
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#include <nlohmann/json.hpp>
#include <iostream>
#include <iomanip>
using json = nlohmann::json;
int main()
{
std::cout << std::setw(4) << json::meta() << std::endl;
}
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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/ rel=canonical><link rel=icon href=../assets/images/favicon.png><meta name=generator content="mkdocs-1.4.2, mkdocs-material-8.5.10"><title>Header only - JSON for Modern C++</title><link rel=stylesheet href=../assets/stylesheets/main.975780f9.min.css><link rel=stylesheet href=../assets/stylesheets/palette.2505c338.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><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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<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 3.54Z"/></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 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z"/></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> Header only </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input 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<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><span class=w></span>
</code></pre></div> <p>to the files you want to process JSON and set the necessary switches to enable C++11 (e.g., <code>-std=c++11</code> for GCC 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> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 8, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../features/types/number_handling/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Number Handling" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> Number Handling </div> </div> </a> <a href=migration_guide/ class="md-footer__link md-footer__link--next" aria-label="Next: Migration Guide" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> Migration Guide </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <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 &copy; 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+57
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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/migration_guide/ rel=canonical><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.4.2, mkdocs-material-8.5.10"><title>Migration Guide - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.975780f9.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.2505c338.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><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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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 3.54Z"/></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 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z"/></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> Migration Guide </span> </div> </div> </div> <form class=md-header__option 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autocomplete=off spellcheck=false data-md-component=search-query required> <label class="md-sLine truncated
<span class=n>std</span><span class=o>::</span><span class=n>stringstream</span><span class=w> </span><span class=n>ss</span><span class=p>(</span><span class=s>&quot;[1,2,3]&quot;</span><span class=p>);</span><span class=w></span>
<span class=n>j</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>ss</span><span class=p>;</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</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>std</span><span class=o>::</span><span class=n>stringstream</span><span class=w> </span><span class=n>ss</span><span class=p>(</span><span class=s>&quot;[1,2,3]&quot;</span><span class=p>);</span><span class=w></span>
<span class=n>ss</span><span class=w> </span><span class=o>&gt;&gt;</span><span class=w> </span><span class=n>j</span><span class=p>;</span><span class=w></span>
</code></pre></div> </div> </div> </div> </li> <li> <p>Passing iterator pairs or pointer/length pairs to parsing functions (<a href=../../api/basic_json/parse/ ><code>parse</code></a>, <a href=../../api/basic_json/accept/ ><code>accept</code></a>, <a href=../../api/basic_json/sax_parse/ ><code>sax_parse</code></a>, <a href=../../api/basic_json/from_cbor/ ><code>from_cbor</code></a>, <a href=../../api/basic_json/from_msgpack/ ><code>from_msgpack</code></a>, <a href=../../api/basic_json/from_ubjson/ ><code>from_ubjson</code></a>, and <a href=../../api/basic_json/from_bson/ ><code>from_bson</code></a> via initializer lists is deprecated since 3.8.0. Instead, pass two iterators; for instance, call <code>from_cbor(ptr, ptr+len)</code> instead of <code>from_cbor({ptr, len})</code>.</p> <div class="tabbed-set tabbed-alternate" data-tabs=2:2><input checked=checked id=__tabbed_2_1 name=__tabbed_2 type=radio><input id=__tabbed_2_2 name=__tabbed_2 type=radio><div class=tabbed-labels><label for=__tabbed_2_1>Deprecated</label><label for=__tabbed_2_2>Future-proof</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=k>const</span><span class=w> </span><span class=kt>char</span><span class=o>*</span><span class=w> </span><span class=n>s</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>&quot;[1,2,3]&quot;</span><span class=p>;</span><span class=w></span>
<span class=kt>bool</span><span class=w> </span><span class=n>ok</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=o>::</span><span class=n>accept</span><span class=p>({</span><span class=n>s</span><span class=p>,</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>std</span><span class=o>::</span><span class=n>strlen</span><span class=p>(</span><span class=n>s</span><span class=p>)});</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=k>const</span><span class=w> </span><span class=kt>char</span><span class=o>*</span><span class=w> </span><span class=n>s</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>&quot;[1,2,3]&quot;</span><span class=p>;</span><span class=w></span>
<span class=kt>bool</span><span class=w> </span><span class=n>ok</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=o>::</span><span class=n>accept</span><span class=p>(</span><span class=n>s</span><span class=p>,</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>std</span><span class=o>::</span><span class=n>strlen</span><span class=p>(</span><span class=n>s</span><span class=p>));</span><span class=w></span>
</code></pre></div> </div> </div> </div> </li> </ul> <h4 id=json-pointers>JSON Pointers<a class=headerlink href=#json-pointers title="Permanent link">&para;</a></h4> <ul> <li> <p>Comparing JSON Pointers with strings via <a href=../../api/json_pointer/operator_eq/ ><code>operator==</code></a> and <a href=../../api/json_pointer/operator_ne/ ><code>operator!=</code></a> is deprecated since 3.11.2. To compare a <a href=../../api/json_pointer/ ><code>json_pointer</code></a> <code>p</code> with a string <code>s</code>, convert <code>s</code> to a <code>json_pointer</code> first and use <a href=../../api/json_pointer/operator_eq/ ><code>json_pointer::operator==</code></a> or <a href=../../api/json_pointer/operator_ne/ ><code>json_pointer::operator!=</code></a>.</p> <div class="tabbed-set tabbed-alternate" data-tabs=3:2><input checked=checked id=__tabbed_3_1 name=__tabbed_3 type=radio><input id=__tabbed_3_2 name=__tabbed_3 type=radio><div class=tabbed-labels><label for=__tabbed_3_1>Deprecated</label><label for=__tabbed_3_2>Future-proof</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>::</span><span class=n>json_pointer</span><span class=w> </span><span class=n>lhs</span><span class=p>(</span><span class=s>&quot;/foo/bar/1&quot;</span><span class=p>);</span><span class=w></span>
<span class=n>assert</span><span class=p>(</span><span class=n>lhs</span><span class=w> </span><span class=o>==</span><span class=w> </span><span class=s>&quot;/foo/bar/1&quot;</span><span class=p>);</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>::</span><span class=n>json_pointer</span><span class=w> </span><span class=n>lhs</span><span class=p>(</span><span class=s>&quot;/foo/bar/1&quot;</span><span class=p>);</span><span class=w></span>
<span class=n>assert</span><span class=p>(</span><span class=n>lhs</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=o>::</span><span class=n>json_pointer</span><span class=p>(</span><span class=s>&quot;/foo/bar/1&quot;</span><span class=p>));</span><span class=w></span>
</code></pre></div> </div> </div> </div> </li> <li> <p>The implicit conversion from JSON Pointers to string (<a href=../../api/json_pointer/operator_string_t/ ><code>json_pointer::operator string_t</code></a>) is deprecated since 3.11.0. Use <a href=../../api/json_pointer/to_string/ ><code>json_pointer::to_string</code></a> instead.</p> <div class="tabbed-set tabbed-alternate" data-tabs=4:2><input checked=checked id=__tabbed_4_1 name=__tabbed_4 type=radio><input id=__tabbed_4_2 name=__tabbed_4 type=radio><div class=tabbed-labels><label for=__tabbed_4_1>Deprecated</label><label for=__tabbed_4_2>Future-proof</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>::</span><span class=n>json_pointer</span><span class=w> </span><span class=n>ptr</span><span class=p>(</span><span class=s>&quot;/foo/bar/1&quot;</span><span class=p>);</span><span class=w></span>
<span class=n>std</span><span class=o>::</span><span class=n>string</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>ptr</span><span class=p>;</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>::</span><span class=n>json_pointer</span><span class=w> </span><span class=n>ptr</span><span class=p>(</span><span class=s>&quot;/foo/bar/1&quot;</span><span class=p>);</span><span class=w></span>
<span class=n>std</span><span class=o>::</span><span class=n>string</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>ptr</span><span class=p>.</span><span class=n>to_string</span><span class=p>();</span><span class=w></span>
</code></pre></div> </div> </div> </div> </li> <li> <p>Passing a <code>basic_json</code> specialization as template parameter <code>RefStringType</code> to <a href=../../api/json_pointer/ ><code>json_pointer</code></a> is deprecated since 3.11.0. The string type can now be directly provided.</p> <div class="tabbed-set tabbed-alternate" data-tabs=5:2><input checked=checked id=__tabbed_5_1 name=__tabbed_5 type=radio><input id=__tabbed_5_2 name=__tabbed_5 type=radio><div class=tabbed-labels><label for=__tabbed_5_1>Deprecated</label><label for=__tabbed_5_2>Future-proof</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=k>using</span><span class=w> </span><span class=n>my_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>basic_json</span><span class=o>&lt;</span><span class=n>std</span><span class=o>::</span><span class=n>map</span><span class=p>,</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>vector</span><span class=p>,</span><span class=w> </span><span class=n>my_string_type</span><span class=o>&gt;</span><span class=p>;</span><span class=w></span>
<span class=n>nlohmann</span><span class=o>::</span><span class=n>json_pointer</span><span class=o>&lt;</span><span class=n>my_json</span><span class=o>&gt;</span><span class=w> </span><span class=n>ptr</span><span class=p>(</span><span class=s>&quot;/foo/bar/1&quot;</span><span class=p>);</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</span><span class=n>json_pointer</span><span class=o>&lt;</span><span class=n>my_string_type</span><span class=o>&gt;</span><span class=w> </span><span class=n>ptr</span><span class=p>(</span><span class=s>&quot;/foo/bar/1&quot;</span><span class=p>);</span><span class=w></span>
</code></pre></div> </div> </div> </div> <p>Thereby, <code>nlohmann::my_json::json_pointer</code> is an alias for <code>nlohmann::json_pointer&lt;my_string_type&gt;</code> and is always an alias to the <code>json_pointer</code> with the appropriate string type for all specializations of <code>basic_json</code>.</p> </li> </ul> <h4 id=miscellaneous-functions>Miscellaneous functions<a class=headerlink href=#miscellaneous-functions title="Permanent link">&para;</a></h4> <ul> <li> <p>The function <code>iterator_wrapper</code> is deprecated since 3.1.0. Please use the member function <a href=../../api/basic_json/items/ ><code>items</code></a> instead.</p> <div class="tabbed-set tabbed-alternate" data-tabs=6:2><input checked=checked id=__tabbed_6_1 name=__tabbed_6 type=radio><input id=__tabbed_6_2 name=__tabbed_6 type=radio><div class=tabbed-labels><label for=__tabbed_6_1>Deprecated</label><label for=__tabbed_6_2>Future-proof</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=k>for</span><span class=w> </span><span class=p>(</span><span class=k>auto</span><span class=w> </span><span class=o>&amp;</span><span class=n>x</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=o>::</span><span class=n>iterator_wrapper</span><span class=p>(</span><span class=n>j</span><span class=p>))</span><span class=w></span>
<span class=p>{</span><span class=w></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>&lt;&lt;</span><span class=w> </span><span class=n>x</span><span class=p>.</span><span class=n>key</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=s>&quot;:&quot;</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>x</span><span class=p>.</span><span class=n>value</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</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=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=k>for</span><span class=w> </span><span class=p>(</span><span class=k>auto</span><span class=w> </span><span class=o>&amp;</span><span class=n>x</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>items</span><span class=p>())</span><span class=w></span>
<span class=p>{</span><span class=w></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>&lt;&lt;</span><span class=w> </span><span class=n>x</span><span class=p>.</span><span class=n>key</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=s>&quot;:&quot;</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>x</span><span class=p>.</span><span class=n>value</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</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=w></span>
</code></pre></div> </div> </div> </div> </li> <li> <p>Function <code>friend std::ostream&amp; operator&gt;&gt;(const basic_json&amp;, std::ostream&amp;)</code> is deprecated since 3.0.0. Please use <a href=../../api/operator_ltlt/ ><code>friend operator&lt;&lt;(std::ostream&amp;, const basic_json&amp;)</code></a> instead.</p> <div class="tabbed-set tabbed-alternate" data-tabs=7:2><input checked=checked id=__tabbed_7_1 name=__tabbed_7 type=radio><input id=__tabbed_7_2 name=__tabbed_7 type=radio><div class=tabbed-labels><label for=__tabbed_7_1>Deprecated</label><label for=__tabbed_7_2>Future-proof</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>j</span><span class=w> </span><span class=o>&gt;&gt;</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=p>;</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>std</span><span class=o>::</span><span class=n>cout</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>j</span><span class=p>;</span><span class=w></span>
</code></pre></div> </div> </div> </div> </li> <li> <p>The legacy comparison behavior for discarded values is deprecated since 3.11.0. It is already disabled by default and can still be enabled by defining <a href=../../api/macros/json_use_legacy_discarded_value_comparison/ ><code>JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON</code></a> to <code>1</code>.</p> <div class="tabbed-set tabbed-alternate" data-tabs=8:2><input checked=checked id=__tabbed_8_1 name=__tabbed_8 type=radio><input id=__tabbed_8_2 name=__tabbed_8 type=radio><div class=tabbed-labels><label for=__tabbed_8_1>Deprecated</label><label for=__tabbed_8_2>Future-proof</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=cp>#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 1</span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span><span class=cp></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span><span class=cp></span>
</code></pre></div> </div> </div> </div> </li> </ul> <h2 id=replace-implicit-conversions>Replace implicit conversions<a class=headerlink href=#replace-implicit-conversions title="Permanent link">&para;</a></h2> <p>Implicit conversions via <a href=../../api/basic_json/operator_ValueType/ ><code>operator ValueType</code></a> will be switched off by default in the next major release of the library.</p> <p>You can prepare existing code by already defining <a href=../../api/macros/json_use_implicit_conversions/ ><code>JSON_USE_IMPLICIT_CONVERSIONS</code></a> to <code>0</code> and replace any implicit conversions with calls to <a href=../../api/basic_json/get/ ><code>get</code></a>, <a href=../../api/basic_json/get_to/ ><code>get_to</code></a>, <a href=../../api/basic_json/get_ref/ ><code>get_ref</code></a>, or <a href=../../api/basic_json/get_ptr/ ><code>get_ptr</code></a>.</p> <div class="tabbed-set tabbed-alternate" data-tabs=9:3><input checked=checked id=__tabbed_9_1 name=__tabbed_9 type=radio><input id=__tabbed_9_2 name=__tabbed_9 type=radio><input id=__tabbed_9_3 name=__tabbed_9 type=radio><div class=tabbed-labels><label for=__tabbed_9_1>Deprecated</label><label for=__tabbed_9_2>Future-proof</label><label for=__tabbed_9_3>Future-proof (alternative)</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</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>&quot;Hello, world!&quot;</span><span class=p>;</span><span class=w></span>
<span class=n>std</span><span class=o>::</span><span class=n>string</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=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</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>&quot;Hello, world!&quot;</span><span class=p>;</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>get</span><span class=o>&lt;</span><span class=n>std</span><span class=o>::</span><span class=n>string</span><span class=o>&gt;</span><span class=p>();</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</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>&quot;Hello, world!&quot;</span><span class=p>;</span><span class=w></span>
<span class=n>std</span><span class=o>::</span><span class=n>string</span><span class=w> </span><span class=n>s</span><span class=p>;</span><span class=w></span>
<span class=n>j</span><span class=p>.</span><span class=n>get_to</span><span class=p>(</span><span class=n>s</span><span class=p>);</span><span class=w></span>
</code></pre></div> </div> </div> </div> <p>You can prepare existing code by already defining <a href=../../api/macros/json_use_implicit_conversions/ ><code>JSON_USE_IMPLICIT_CONVERSIONS</code></a> to <code>0</code> and replace any implicit conversions with calls to <a href=../../api/basic_json/get/ ><code>get</code></a>.</p> <h2 id=import-namespace-literals-for-udls>Import namespace <code>literals</code> for UDLs<a class=headerlink href=#import-namespace-literals-for-udls title="Permanent link">&para;</a></h2> <p>The user-defined string literals <a href=../../api/operator_literal_json/ ><code>operator""_json</code></a> and <a href=../../api/operator_literal_json_pointer/ ><code>operator""_json_pointer</code></a> will be removed from the global namespace in the next major release of the library.</p> <div class="tabbed-set tabbed-alternate" data-tabs=10:2><input checked=checked id=__tabbed_10_1 name=__tabbed_10 type=radio><input id=__tabbed_10_2 name=__tabbed_10 type=radio><div class=tabbed-labels><label for=__tabbed_10_1>Deprecated</label><label for=__tabbed_10_2>Future-proof</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=n>nlohmann</span><span class=o>::</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>&quot;[1,2,3]&quot;</span><span class=n>_json</span><span class=p>;</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=k>using</span><span class=w> </span><span class=k>namespace</span><span class=w> </span><span class=nn>nlohmann</span><span class=o>::</span><span class=nn>literals</span><span class=p>;</span><span class=w></span>
<span class=n>nlohmann</span><span class=o>::</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>&quot;[1,2,3]&quot;</span><span class=n>_json</span><span class=p>;</span><span class=w></span>
</code></pre></div> </div> </div> </div> <p>To prepare existing code, define <a href=../../api/macros/json_use_global_udls/ ><code>JSON_USE_GLOBAL_UDLS</code></a> to <code>0</code> and bring the string literals into scope where needed.</p> <h2 id=do-not-hard-code-the-complete-library-namespace>Do not hard-code the complete library namespace<a class=headerlink href=#do-not-hard-code-the-complete-library-namespace title="Permanent link">&para;</a></h2> <p>The <a href=../../features/namespace/ ><code>nlohmann</code> namespace</a> contains a sub-namespace to avoid problems when different versions or configurations of the library are used in the same project. Always use <code>nlohmann</code> as namespace or, when the exact version and configuration is relevant, use macro <a href=../../api/macros/nlohmann_json_namespace/ ><code>NLOHMANN_JSON_NAMESPACE</code></a> to denote the namespace.</p> <div class="tabbed-set tabbed-alternate" data-tabs=11:3><input checked=checked id=__tabbed_11_1 name=__tabbed_11 type=radio><input id=__tabbed_11_2 name=__tabbed_11 type=radio><input id=__tabbed_11_3 name=__tabbed_11 type=radio><div class=tabbed-labels><label for=__tabbed_11_1>Dangerous</label><label for=__tabbed_11_2>Future-proof</label><label for=__tabbed_11_3>Future-proof (alternative)</label></div> <div class=tabbed-content> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=kt>void</span><span class=w> </span><span class=nf>to_json</span><span class=p>(</span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json_abi_v3_11_2</span><span class=o>::</span><span class=n>json</span><span class=o>&amp;</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>person</span><span class=o>&amp;</span><span class=w> </span><span class=n>p</span><span class=p>)</span><span class=w></span>
<span class=p>{</span><span class=w></span>
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>&quot;age&quot;</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=w></span>
<span class=p>}</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=kt>void</span><span class=w> </span><span class=nf>to_json</span><span class=p>(</span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=o>&amp;</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>person</span><span class=o>&amp;</span><span class=w> </span><span class=n>p</span><span class=p>)</span><span class=w></span>
<span class=p>{</span><span class=w></span>
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>&quot;age&quot;</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=w></span>
<span class=p>}</span><span class=w></span>
</code></pre></div> </div> <div class=tabbed-block> <div class=highlight><pre><span></span><code><span class=kt>void</span><span class=w> </span><span class=nf>to_json</span><span class=p>(</span><span class=n>NLOHMANN_JSON_NAMESPACE</span><span class=o>::</span><span class=n>json</span><span class=o>&amp;</span><span class=w> </span><span class=n>j</span><span class=p>,</span><span class=w> </span><span class=k>const</span><span class=w> </span><span class=n>person</span><span class=o>&amp;</span><span class=w> </span><span class=n>p</span><span class=p>)</span><span class=w></span>
<span class=p>{</span><span class=w></span>
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>&quot;age&quot;</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=w></span>
<span class=p>}</span><span class=w></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">&para;</a></h2> <p>The <code>details</code> namespace is not part of the public API of the library and can change in any version without announcement. Do not rely on any function or type in the <code>details</code> namespace.</p> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 8, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../ class="md-footer__link md-footer__link--prev" aria-label="Previous: Header only" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> Header only </div> </div> </a> <a href=../cmake/ class="md-footer__link md-footer__link--next" aria-label="Next: CMake" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> CMake </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <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 &copy; 2013 - 2022 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 0 496 512"><!-- Font Awesome Free 6.2.1 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 2022 Fonticons, Inc.--><path d="M165.9 397.4c0 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 3.6zm-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 2.3zm44.2-1.7c-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-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 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 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-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-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-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-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"/></svg> </a> <a href=https://twitter.com/nlohmann target=_blank rel=noopener title=twitter.com class=md-social__link> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 6.2.1 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 2022 Fonticons, Inc.--><path d="M459.37 151.716c.325 4.548.325 9.097.325 13.645 0 138.72-105.583 298.558-298.558 298.558-59.452 0-114.68-17.219-161.137-47.106 8.447.974 16.568 1.299 25.34 1.299 49.055 0 94.213-16.568 130.274-44.832-46.132-.975-84.792-31.188-98.112-72.772 6.498.974 12.995 1.624 19.818 1.624 9.421 0 18.843-1.3 27.614-3.573-48.081-9.747-84.143-51.98-84.143-102.985v-1.299c13.969 7.797 30.214 12.67 47.431 13.319-28.264-18.843-46.781-51.005-46.781-87.391 0-19.492 5.197-37.36 14.294-52.954 51.655 63.675 129.3 105.258 216.365 109.807-1.624-7.797Line 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/integration/package_managers/ rel=canonical><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.4.2, mkdocs-material-8.5.10"><title>Package Managers - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.975780f9.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.2505c338.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><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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<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iostream&gt;</span><span class=cp></span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iomanip&gt;</span><span class=cp></span>
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span><span class=w></span>
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span><span class=w></span>
<span class=p>{</span><span class=w></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>&lt;&lt;</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>meta</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</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=w></span>
</code></pre></div> <p>When executed, this program should create output similar to</p> <div class=highlight><pre><span></span><code><span class=p>{</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;compiler&quot;</span><span class=p>:</span><span class=w> </span><span class=p>{</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;c++&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;201103&quot;</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;family&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;gcc&quot;</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;version&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;12.1.0&quot;</span><span class=w></span>
<span class=w> </span><span class=p>},</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;copyright&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;(C) 2013-2022 Niels Lohmann&quot;</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;name&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;JSON for Modern C++&quot;</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;platform&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;apple&quot;</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;url&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;https://github.com/nlohmann/json&quot;</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;version&quot;</span><span class=p>:</span><span class=w> </span><span class=p>{</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;major&quot;</span><span class=p>:</span><span class=w> </span><span class=mi>3</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;minor&quot;</span><span class=p>:</span><span class=w> </span><span class=mi>11</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;patch&quot;</span><span class=p>:</span><span class=w> </span><span class=mi>2</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;string&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;3.11.2&quot;</span><span class=w></span>
<span class=w> </span><span class=p>}</span><span class=w></span>
<span class=p>}</span><span class=w></span>
</code></pre></div> <h2 id=homebrew>Homebrew<a class=headerlink href=#homebrew title="Permanent link">&para;</a></h2> <p>If you are using OS X and <a href=http://brew.sh>Homebrew</a>, just type</p> <div class=highlight><pre><span></span><code>brew install nlohmann-json
</code></pre></div> <p>and you're set. If you want the bleeding edge rather than the latest release, use</p> <div class=highlight><pre><span></span><code>brew install nlohmann-json --HEAD
</code></pre></div> <p>instead. See <a href=https://formulae.brew.sh/formula/nlohmann-json>nlohmann-json</a> for more information.</p> <details class=example> <summary>Example</summary> <ol> <li> <p>Create the following file:</p> <div class=highlight><span class=filename>example.cpp</span><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span><span class=cp></span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iostream&gt;</span><span class=cp></span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iomanip&gt;</span><span class=cp></span>
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span><span class=w></span>
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span><span class=w></span>
<span class=p>{</span><span class=w></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>&lt;&lt;</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>meta</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</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=w></span>
</code></pre></div> </li> <li> <p>Install the package</p> <div class=highlight><pre><span></span><code>brew install nlohmann-json
</code></pre></div> </li> <li> <p>Determine the include path, which defaults to <code>/usr/local/Cellar/nlohmann-json/$version/include</code>, where <code>$version</code> is the version of the library, e.g. <code>3.7.3</code>. The path of the library can be determined with</p> <div class=highlight><pre><span></span><code>brew list nlohmann-json
</code></pre></div> </li> <li> <p>Compile the code. For instance, the code can be compiled using Clang with</p> <div class=highlight><pre><span></span><code>clang++ example.cpp -I/usr/local/Cellar/nlohmann-json/3.7.3/include -std<span class=o>=</span>c++11 -o example
</code></pre></div> </li> </ol> </details> <p><span class=twemoji><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 10.12h-6.78l2.74-2.82c-2.73-2.7-7.15-2.8-9.88-.1a6.887 6.887 0 0 0 0 9.8c2.73 2.7 7.15 2.7 9.88 0 1.36-1.35 2.04-2.92 2.04-4.9h2c0 1.98-.88 4.55-2.64 6.29-3.51 3.48-9.21 3.48-12.72 0-3.5-3.47-3.53-9.11-.02-12.58a8.987 8.987 0 0 1 12.65 0L21 3v7.12M12.5 8v4.25l3.5 2.08-.72 1.21L11 13V8h1.5Z"/></svg></span> The <a href=https://formulae.brew.sh/formula/nlohmann-json>formula</a> is updated automatically.</p> <h2 id=meson>Meson<a class=headerlink href=#meson title="Permanent link">&para;</a></h2> <p>If you are using the <a href=http://mesonbuild.com>Meson Build System</a>, add this source tree as a <a href=https://mesonbuild.com/Subprojects.html#using-a-subproject>meson subproject</a>. You may also use the <code>include.zip</code> published in this project's <a href=https://github.com/nlohmann/json/releases>Releases</a> to reduce the size of the vendored source tree. Alternatively, you can get a wrap file by downloading it from <a href=https://wrapdb.mesonbuild.com/nlohmann_json>Meson WrapDB</a>, or simply use <code>meson wrap install nlohmann_json</code>. Please see the meson project for any issues regarding the packaging.</p> <p>The provided <code>meson.build</code> can also be used as an alternative to cmake for installing <code>nlohmann_json</code> system-wide in which case a pkg-config file is installed. To use it, simply have your build system require the <code>nlohmann_json</code> pkg-config dependency. In Meson, it is preferred to use the <a href=https://mesonbuild.com/Reference-manual.html#dependency><code>dependency()</code></a> object with a subproject fallback, rather than using the subproject directly.</p> <h2 id=bazel>Bazel<a class=headerlink href=#bazel title="Permanent link">&para;</a></h2> <p>This repository provides a <a href=https://bazel.build/ >Bazel</a> <code>WORKSPACE.bazel</code> and a corresponding <code>BUILD.bazel</code> file. Therefore, this repository can be referenced by workspace rules such as <code>http_archive</code>, <code>git_repository</code>, or <code>local_repository</code> from other Bazel workspaces. To use the library you only need to depend on the target <code>@nlohmann_json//:json</code> (e.g. via <code>deps</code> attribute).</p> <h2 id=conan>Conan<a class=headerlink href=#conan title="Permanent link">&para;</a></h2> <p>If you are using <a href=https://www.conan.io/ >Conan</a> to manage your dependencies, merely add <code>nlohmann_json/x.y.z</code> to your <code>conanfile</code>'s requires, where <code>x.y.z</code> is the release version you want to use. Please file issues <a href=https://github.com/conan-io/conan-center-index/issues>here</a> if you experience problems with the packages.</p> <details class=example> <summary>Example</summary> <ol> <li> <p>Create the following files:</p> <div class=highlight><span class=filename>Conanfile.txt</span><pre><span></span><code><span class=k>[requires]</span><span class=w></span>
<span class=na>nlohmann_json/3.7.3</span><span class=w></span>
<span class=k>[generators]</span><span class=w></span>
<span class=na>cmake</span><span class=w></span>
</code></pre></div> <div class=highlight><span class=filename>CMakeLists.txt</span><pre><span></span><code><span class=nb>project</span><span class=p>(</span><span class=s>json_example</span><span class=p>)</span>
<span class=nb>cmake_minimum_required</span><span class=p>(</span><span class=s>VERSION</span><span class=w> </span><span class=s>2.8.12</span><span class=p>)</span>
<span class=nb>add_definitions</span><span class=p>(</span><span class=s2>&quot;-std=c++11&quot;</span><span class=p>)</span>
<span class=nb>include</span><span class=p>(</span><span class=o>${</span><span class=nv>CMAKE_BINARY_DIR</span><span class=o>}</span><span class=s>/conanbuildinfo.cmake</span><span class=p>)</span>
<span class=nb>conan_basic_setup</span><span class=p>()</span>
<span class=nb>add_executable</span><span class=p>(</span><span class=s>json_example</span><span class=w> </span><span class=s>example.cpp</span><span class=p>)</span>
<span class=nb>target_link_libraries</span><span class=p>(</span><span class=s>json_example</span><span class=w> </span><span class=o>${</span><span class=nv>CONAN_LIBS</span><span class=o>}</span><span class=p>)</span>
</code></pre></div> <div class=highlight><span class=filename>example.cpp</span><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span><span class=cp></span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iostream&gt;</span><span class=cp></span>
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span><span class=w></span>
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span><span class=w></span>
<span class=p>{</span><span class=w></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>&lt;&lt;</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>meta</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</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=w></span>
</code></pre></div> </li> <li> <p>Build:</p> <div class=highlight><pre><span></span><code>mkdir build
<span class=nb>cd</span> build
conan install ..
cmake ..
cmake --build .
</code></pre></div> </li> </ol> </details> <p><span class=twemoji><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 10.12h-6.78l2.74-2.82c-2.73-2.7-7.15-2.8-9.88-.1a6.887 6.887 0 0 0 0 9.8c2.73 2.7 7.15 2.7 9.88 0 1.36-1.35 2.04-2.92 2.04-4.9h2c0 1.98-.88 4.55-2.64 6.29-3.51 3.48-9.21 3.48-12.72 0-3.5-3.47-3.53-9.11-.02-12.58a8.987 8.987 0 0 1 12.65 0L21 3v7.12M12.5 8v4.25l3.5 2.08-.72 1.21L11 13V8h1.5Z"/></svg></span> The <a href=https://conan.io/center/nlohmann_json>package</a> is updated automatically.</p> <h2 id=spack>Spack<a class=headerlink href=#spack title="Permanent link">&para;</a></h2> <p>If you are using <a href=https://www.spack.io/ >Spack</a> to manage your dependencies, you can use the <a href=https://spack.readthedocs.io/en/latest/package_list.html#nlohmann-json><code>nlohmann-json</code> package</a>. Please see the <a href=https://github.com/spack/spack>spack project</a> for any issues regarding the packaging.</p> <h2 id=hunter>Hunter<a class=headerlink href=#hunter title="Permanent link">&para;</a></h2> <p>If you are using <a href=https://github.com/cpp-pm/hunter>hunter</a> on your project for external dependencies, then you can use the <a href=https://hunter.readthedocs.io/en/latest/packages/pkg/nlohmann_json.html>nlohmann_json package</a>. Please see the hunter project for any issues regarding the packaging.</p> <h2 id=buckaroo>Buckaroo<a class=headerlink href=#buckaroo title="Permanent link">&para;</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>. Please file issues <a href=https://github.com/buckaroo-pm/nlohmann-json>here</a>. There is a demo repo <a href=https://github.com/njlr/buckaroo-nholmann-json-example>here</a>.</p> <h2 id=vcpkg>vcpkg<a class=headerlink href=#vcpkg title="Permanent link">&para;</a></h2> <p>If you are using <a href=https://github.com/Microsoft/vcpkg/ >vcpkg</a> on your project for external dependencies, then you can install the <a href=https://github.com/Microsoft/vcpkg/tree/master/ports/nlohmann-json>nlohmann-json package</a> with <code>vcpkg install nlohmann-json</code> and follow the then displayed descriptions. Please see the vcpkg project for any issues regarding the packaging.</p> <details class=example> <summary>Example</summary> <ol> <li> <p>Create the following files:</p> <div class=highlight><span class=filename>CMakeLists.txt</span><pre><span></span><code><span class=nb>project</span><span class=p>(</span><span class=s>json_example</span><span class=p>)</span>
<span class=nb>cmake_minimum_required</span><span class=p>(</span><span class=s>VERSION</span><span class=w> </span><span class=s>2.8.12</span><span class=p>)</span>
<span class=nb>find_package</span><span class=p>(</span><span class=s>nlohmann_json</span><span class=w> </span><span class=s>CONFIG</span><span class=w> </span><span class=s>REQUIRED</span><span class=p>)</span>
<span class=nb>add_executable</span><span class=p>(</span><span class=s>json_example</span><span class=w> </span><span class=s>example.cpp</span><span class=p>)</span>
<span class=nb>target_link_libraries</span><span class=p>(</span><span class=s>json_example</span><span class=w> </span><span class=s>PRIVATE</span><span class=w> </span><span class=s>nlohmann_json::nlohmann_json</span><span class=p>)</span>
</code></pre></div> <div class=highlight><span class=filename>example.cpp</span><pre><span></span><code><span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span><span class=cp></span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;iostream&gt;</span><span class=cp></span>
<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span><span class=w></span>
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span><span class=w></span>
<span class=p>{</span><span class=w></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>&lt;&lt;</span><span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>meta</span><span class=p>()</span><span class=w> </span><span class=o>&lt;&lt;</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=w></span>
</code></pre></div> </li> <li> <p>Install package:</p> <div class=highlight><pre><span></span><code>vcpkg install nlohmann-json
</code></pre></div> </li> <li> <p>Build:</p> <div class=highlight><pre><span></span><code>mkdir build
<span class=nb>cd</span> build
cmake .. -DCMAKE_TOOLCHAIN_FILE<span class=o>=</span>/path/to/vcpkg/scripts/buildsystems/vcpkg.cmake
cmake --build .
</code></pre></div> </li> </ol> <p>Note you need to adjust <code>/path/to/vcpkg/scripts/buildsystems/vcpkg.cmake</code> to your system.</p> </details> <h2 id=cget>cget<a class=headerlink href=#cget title="Permanent link">&para;</a></h2> <p>If you are using <a href=http://cget.readthedocs.io/en/latest/ >cget</a>, you can install the latest development version with <code>cget install nlohmann/json</code>. A specific version can be installed with <code>cget install nlohmann/json@v3.1.0</code>. Also, the multiple header version can be installed by adding the <code>-DJSON_MultipleHeaders=ON</code> flag (i.e., <code>cget install nlohmann/json -DJSON_MultipleHeaders=ON</code>).</p> <p><span class=twemoji><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 10.12h-6.78l2.74-2.82c-2.73-2.7-7.15-2.8-9.88-.1a6.887 6.887 0 0 0 0 9.8c2.73 2.7 7.15 2.7 9.88 0 1.36-1.35 2.04-2.92 2.04-4.9h2c0 1.98-.88 4.55-2.64 6.29-3.51 3.48-9.21 3.48-12.72 0-3.5-3.47-3.53-9.11-.02-12.58a8.987 8.987 0 0 1 12.65 0L21 3v7.12M12.5 8v4.25l3.5 2.08-.72 1.21L11 13V8h1.5Z"/></svg></span> cget reads directly from the <a href=https://github.com/nlohmann/json>GitHub repository</a> and is always up-to-date.</p> <h2 id=cocoapods>CocoaPods<a class=headerlink href=#cocoapods title="Permanent link">&para;</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", '~&gt;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=nuget>NuGet<a class=headerlink href=#nuget title="Permanent link">&para;</a></h2> <p>If you are using <a href=https://www.nuget.org>NuGet</a>, you can use the package <a href=https://www.nuget.org/packages/nlohmann.json/ >nlohmann.json</a>. Please check <a href=https://github.com/nlohmann/json/issues/1132#issuecomment-452250255>this extensive description</a> on how to use the package. Please file issues <a href=https://github.com/hnkb/nlohmann-json-nuget/issues>here</a>.</p> <h2 id=conda>Conda<a class=headerlink href=#conda title="Permanent link">&para;</a></h2> <p>If you are using <a href=https://conda.io/ >conda</a>, you can use the package <a href=https://github.com/conda-forge/nlohmann_json-feedstock>nlohmann_json</a> from <a href=https://conda-forge.org>conda-forge</a> executing <code>conda install -c conda-forge nlohmann_json</code>. Please file issues <a href=https://github.com/conda-forge/nlohmann_json-feedstock/issues>here</a>.</p> <h2 id=msys2>MSYS2<a class=headerlink href=#msys2 title="Permanent link">&para;</a></h2> <p>If you are using <a href=http://www.msys2.org/ >MSYS2</a>, you can use the <a href=https://packages.msys2.org/base/mingw-w64-nlohmann-json>mingw-w64-nlohmann-json</a> package, just type <code>pacman -S mingw-w64-i686-nlohmann-json</code> or <code>pacman -S mingw-w64-x86_64-nlohmann-json</code> for installation. Please file issues <a href="https://github.com/msys2/MINGW-packages/issues/new?title=%5Bnlohmann-json%5D">here</a> if you experience problems with the packages.</p> <p><span class=twemoji><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 10.12h-6.78l2.74-2.82c-2.73-2.7-7.15-2.8-9.88-.1a6.887 6.887 0 0 0 0 9.8c2.73 2.7 7.15 2.7 9.88 0 1.36-1.35 2.04-2.92 2.04-4.9h2c0 1.98-.88 4.55-2.64 6.29-3.51 3.48-9.21 3.48-12.72 0-3.5-3.47-3.53-9.11-.02-12.58a8.987 8.987 0 0 1 12.65 0L21 3v7.12M12.5 8v4.25l3.5 2.08-.72 1.21L11 13V8h1.5Z"/></svg></span> The <a href=https://packages.msys2.org/base/mingw-w64-nlohmann-json>package</a> is updated automatically.</p> <h2 id=macports>MacPorts<a class=headerlink href=#macports title="Permanent link">&para;</a></h2> <p>If you are using <a href=https://ports.macports.org>MacPorts</a>, execute <code>sudo port install nlohmann-json</code> to install the <a href=https://ports.macports.org/port/nlohmann-json/ >nlohmann-json</a> package.</p> <p><span class=twemoji><svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 10.12h-6.78l2.74-2.82c-2.73-2.7-7.15-2.8-9.88-.1a6.887 6.887 0 0 0 0 9.8c2.73 2.7 7.15 2.7 9.88 0 1.36-1.35 2.04-2.92 2.04-4.9h2c0 1.98-.88 4.55-2.64 6.29-3.51 3.48-9.21 3.48-12.72 0-3.5-3.47-3.53-9.11-.02-12.58a8.987 8.987 0 0 1 12.65 0L21 3v7.12M12.5 8v4.25l3.5 2.08-.72 1.21L11 13V8h1.5Z"/></svg></span> The <a href=https://ports.macports.org/port/nlohmann-json/ >package</a> is updated automatically.</p> <h2 id=build2>build2<a class=headerlink href=#build2 title="Permanent link">&para;</a></h2> <p>If you are using <a href=https://build2.org><code>build2</code></a>, you can use the <a href=https://cppget.org/nlohmann-json><code>nlohmann-json</code></a> package from the public repository <a href=http://cppget.org>http://cppget.org</a> or directly from the <a href=https://github.com/build2-packaging/nlohmann-json>package's sources repositorLine truncated
<span class=w> </span><span class=s>NAME</span><span class=w> </span><span class=s>nlohmann_json</span>
<span class=w> </span><span class=s>GITHUB_REPOSITORY</span><span class=w> </span><span class=s>nlohmann/json</span>
<span class=w> </span><span class=s>VERSION</span><span class=w> </span><span class=s>3.9.1</span><span class=p>)</span>
</code></pre></div> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 8, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../cmake/ class="md-footer__link md-footer__link--prev" aria-label="Previous: CMake" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> CMake </div> </div> </a> <a href=../pkg-config/ class="md-footer__link md-footer__link--next" aria-label="Next: Pkg-config" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> Pkg-config </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <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 &copy; 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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>&#39;nlohmann_json&#39;</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><span class=w></span>
</code></pre></div> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 8, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../package_managers/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Package Managers" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> Package Managers </div> </div> </a> <a href=../../api/basic_json/ class="md-footer__link md-footer__link--next" aria-label="Next: Overview" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> Overview </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <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 &copy; 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project(json_example)
cmake_minimum_required(VERSION 2.8.12)
find_package(nlohmann_json CONFIG REQUIRED)
add_executable(json_example example.cpp)
target_link_libraries(json_example PRIVATE nlohmann_json::nlohmann_json)
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#include <nlohmann/json.hpp>
#include <iostream>
using json = nlohmann::json;
int main()
{
std::cout << json::meta() << std::endl;
}