:construction: If you want to understand the API better, check out the API Reference. :books: If you want to learn more about how to use the library, check out the rest of the README, have a look at code examples, or browse through the help pages. :question: If you have a question, please check if it is already answered in the FAQ or the Q&A section. You can sponsor this library at GitHub Sponsors. See the contribution guidelines for more information.

If you know how to use a std::vector or std::map, you are already set. However, if your goal is to speed up your development by adding JSON support with a single header, then this library is the way to go. There are certainly faster JSON libraries out there. However, you can template the generalized class basic_json to your needs. The default generalization uses the following C++ data types: std::string for strings, int64_t, uint64_t or double for numbers, std::map for objects, std::vector for arrays, and bool for Booleans.

Each JSON object has an overhead of one pointer (the maximal size of a union) and one enumeration element (1 byte). Other aspects were not so important to us: To maintain high quality, the project is following the Core Infrastructure Initiative (CII) best practices. Google OSS-Fuzz additionally runs fuzz tests against all parsers 24/7, effectively executing billions of tests so far. Furthermore, we checked with Valgrind and the Clang Sanitizers that there are no memory leaks. Our code is heavily unit-tested and covers 100% of the code, including all exceptional behavior. All in all, everything should require no adjustment of your compiler flags or project settings. No library, no subproject, no dependencies, no complex build system. Our whole code consists of a single header file json.hpp. Check out the examples below and you'll know what I mean. We used all the operator magic of modern C++ to achieve the same feeling in your code. In languages such as Python, JSON feels like a first class data type. There are myriads of JSON libraries out there, and each may even have its reason to exist.

Binary formats (BSON, CBOR, MessagePack, UBJSON, and BJData).

Creating json objects from JSON literals.

Support ( documentation, FAQ, discussions, API, bug issues).

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