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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.
Requirements
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_):
`string_view`
`memory_resource`, `polymorphic_allocator`
`error_category`, `error_code`, `error_condition`, `system_error`
Header-Only
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 auto-linking.
Embedded
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:
Supported Compilers
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 https://datatracker.ietf.org/doc/html/rfc8259#section-8.1[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
Quality Assurance
The development infrastructure for the library includes these per-commit analyses:
English Actions
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.
Requirements
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_):
`string_view`
`memory_resource`, `polymorphic_allocator`
`error_category`, `error_code`, `error_condition`, `system_error`
Header-Only
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.
Quality Assurance
The development infrastructure for the library includes these per-commit analyses:
Coverage reports
Benchmark performance comparisons
Compilation and tests on Drone.io, Azure Pipelines, Appveyor
Fuzzing using clang-llvm and machine learning
License
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)
Branch
https://github.com/boostorg/json/tree/master[`master`]
https://github.com/boostorg/json/tree/develop[`develop`]
https://azure.microsoft.com/en-us/services/devops/pipelines/[Azure]
https://vinniefalco.visualstudio.com/json/_build/latest?definitionId=5&branchName=master[image:https://img.shields.io/azure-devops/build/vinniefalco/2571d415-8cc8-4120-a762-c03a8eda0659/8/master[Build
Status]] |https://vinniefalco.visualstudio.com/json/_build/latest?definitionId=8&branchName=develop[image:https://img.shields.io/azure-devops/build/vinniefalco/2571d415-8cc8-4120-a762-c03a8eda0659/8/develop[Build Status]]

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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.
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.
06/05/2026
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String information

Flags
read-only, safe-html, strict-same
Unit identifier
35190
Source string location
:103
String age
06/05/2026
Last updated
06/05/2026
Source string age
06/05/2026
Translation file AsciiDoc file
doc/library-detail.adoc, string 50