JSON parsing, serialization, and DOM in C++11
This library focuses on a common and popular use-case: parsing and
serializing to and from a container called
value which holds JSON
value which you build can be serialized and then
deserialized, guaranteeing that the result will be equal to the original
value. Whatever JSON output you produce with this library will be
readable by most common JSON implementations in any language.
value container is designed to be well suited as a vocabulary type
appropriate for use in public interfaces and libraries, allowing them to
be composed. The library restricts the representable data types to the
ranges which are almost universally accepted by most JSON
both highly performant, meeting or exceeding the benchmark performance
of the best comparable libraries. Allocators are very well supported.
Code which uses these types will be easy to understand, flexible, and
Boost.JSON offers these features:
Require only C++11
Fast streaming parser and serializer
Constant-time key lookup for objects
Options to allow non-standard JSON
Easy and safe modern API with allocator support
Optional header-only, without linking to a library
Visit https://boost.org/libs/json for complete documentation.
Requires only C++11
Link to a built static or dynamic Boost library, or use header-only (see below)
Supports -fno-exceptions, detected automatically
The library relies heavily on these well known C++ types in its interfaces (henceforth termed standard types):
To use as header-only; that is, to eliminate the requirement to link a program to a static or dynamic Boost.JSON library, simply place the following line in exactly one new or existing source file in your project.
MSVC users must also define the macro
BOOST_JSON_NO_LIB to disable
Boost.JSON works great on embedded devices. The library uses local stack buffers to increase the performance of some operations. On Intel platforms these buffers are large (4KB), while on non-Intel platforms they are small (256 bytes). To adjust the size of the stack buffers for embedded applications define this macro when building the library or including the function definitions:
#define BOOST_JSON_STACK_BUFFER_SIZE 1024 #include <boost/json/src.hpp>
Boost.JSON has been tested with the following compilers:
clang: 3.5, 3.6, 3.7, 3.8, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
gcc: 4.8, 4.9, 5, 6, 7, 8, 9, 10, 11, 12
msvc: 14.0, 14.1, 14.2, 14.3
Supported JSON Text
The library expects input text to be encoded using UTF-8, which is a requirement put on all JSON exchanged between systems by the RFC. Similarly, the text generated by the library is valid UTF-8.
The RFC does not allow byte order marks (BOM) to appear in JSON text, so the library considers BOM syntax errors.
The library supports several popular JSON extensions. These have to be explicitly enabled.
Visual Studio Solution
cmake -G "Visual Studio 16 2019" -A Win32 -B bin -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/msvc.cmake cmake -G "Visual Studio 16 2019" -A x64 -B bin64 -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/msvc.cmake
The development infrastructure for the library includes these per-commit analyses:
Benchmark performance comparisons
Compilation and tests on Drone.io, Azure Pipelines, Appveyor
Fuzzing using clang-llvm and machine learning
Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)