instead, you could also write (which looks very similar to the JSON above) add another object (using an initializer list of pairs) add an array that is stored as std::vector (using an initializer list) add another null object by passing nullptr add a string that is stored as std::string add a number that is stored as double (note the implicit conversion of j to an object) To create a json object by reading a JSON file: The json class provides an API for manipulating a JSON value. For example, the emplace() function has a matching emplace.cpp example file.
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Here are some examples to give you an idea how to use the class.īeside the examples below, you may want to:Įvery API function (documented in the API Documentation) has a corresponding standalone example file.
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There is also a docset for the documentation browsers Dash, Velocity, and Zeal that contains the full documentation as offline resource. Please provide as much information as possible to help us understand and reproduce your issue. Please also have a look at the issue list before you create a new issue. 🐛 If you found a bug, please check the FAQ if it is a known issue or the result of a design decision. 🚧 If you want to understand the API better, check out the API Reference.
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📚 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. ❓ 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.
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files, string streams) Read from iterator range Custom data source SAX interface STL-like access Conversion from STL containers JSON Pointer and JSON Patch JSON Merge Patch Implicit conversions Arbitrary types conversions Basic usage Simplify your life with macros Examples How do I convert third-party types? How can I use get() for non-default constructible/non-copyable types? Can I write my own serializer? (Advanced use) Specializing enum conversion Binary formats (BSON, CBOR, MessagePack, UBJSON, and BJData) Supported compilers Integration CMake External Embedded Embedded (FetchContent) Supporting Both Package Managers Pkg-config License Contact Security Thanks Used third-party tools Projects using JSON for Modern C++ Notes Character encoding Comments in JSON Order of object keys Memory Release Further notes Execute unit tests README.md Design goals Sponsors 🏢 Corporate Sponsor 🏷️ Named Sponsors Support Examples Read JSON from a file Creating json objects from JSON literals JSON as first-class data type Serialization / Deserialization To/from strings To/from streams (e.g.
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