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98 lines
3.7 KiB
Markdown
98 lines
3.7 KiB
Markdown
# JSON for Modern C++
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JSON for Modern C++ is a header-only C++11 library that turns JSON into a first-class C++ data type, using the operator magic of modern C++ so that creating, reading, and modifying JSON values feels as natural as it does in languages like Python. The whole library is available as a single header, `json.hpp`, with no dependencies, no subproject, and no complex build system to set up; a companion header, `json_fwd.hpp`, provides forward declarations to keep compile times down. See [header-only integration](https://json.nlohmann.me/integration/index.md) for details. It is heavily unit-tested with 100% code coverage, checked with Valgrind and the Clang Sanitizers for memory leaks, and continuously fuzz-tested by Google OSS-Fuzz.
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## Quick start
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Add the single header to your project and use the library like this:
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```
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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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int main()
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{
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// parse a JSON string
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json j = json::parse(R"({"happy": true, "pi": 3.141})");
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// access and modify values
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j["name"] = "Niels";
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j["list"] = {1, 0, 2};
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// serialize with an indent of 4 spaces
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std::cout << j.dump(4) << '\n';
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}
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```
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Get the library by copying the single header [`json.hpp`](https://github.com/nlohmann/json/releases) from the releases page into a directory `nlohmann` on your include path, or by installing it with a package manager:
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```
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brew install nlohmann-json # Homebrew
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vcpkg install nlohmann-json # vcpkg
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```
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```
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find_package(nlohmann_json 3.12.0 REQUIRED)
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target_link_libraries(myproject PRIVATE nlohmann_json::nlohmann_json)
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```
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See [Integration](https://json.nlohmann.me/integration/index.md) for CMake in detail, all supported package managers (Conan, Meson, Bazel, Conda, and more), and pkg-config.
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## Explore the documentation
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- **Features**
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______________________________________________________________________
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Creating, parsing, accessing, and serializing JSON values, JSON Pointer/Patch, binary formats, and more.
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[Features](https://json.nlohmann.me/features/index.md)
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- **Integration**
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______________________________________________________________________
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Add the library to your project via a single header, CMake, a package manager, or pkg-config.
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[Integration](https://json.nlohmann.me/integration/index.md)
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- **API documentation**
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______________________________________________________________________
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The complete reference for `basic_json` and its member functions, types, and related classes.
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[API documentation](https://json.nlohmann.me/api/basic_json/index.md)
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- **FAQ**
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______________________________________________________________________
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Answers to common questions and known surprises when using the library.
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[FAQ](https://json.nlohmann.me/home/faq/index.md)
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- **Releases**
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______________________________________________________________________
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What changed in each release, with links to the relevant documentation.
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[Releases](https://json.nlohmann.me/home/releases/index.md)
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- **Community**
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______________________________________________________________________
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The ecosystem, contribution guidelines, governance, and quality assurance around the project.
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[Community](https://json.nlohmann.me/community/index.md)
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Unreleased changes
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This documentation is built from the `develop` branch and may describe changes that are not part of a release yet. Their version numbers are followed by an unreleased badge; see [Releases](https://json.nlohmann.me/home/releases/index.md) for what shipped in each version.
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The library is licensed under the [MIT License](https://json.nlohmann.me/home/license/index.md). The source code, issue tracker, and discussions are on [GitHub](https://github.com/nlohmann/json).
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