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  1. 8190e06 Fix wrong usage of doxygen groups (#1417) by mwestphal · 11 months ago master
  2. 42e892d Use default rather than hard-coded 8 for maximum aggregate member alignment (#1378) by Jessica Clarke · 1 year, 5 months ago
  3. a1f1613 Fix various typos (#1350) by luzpaz · 1 year, 6 months ago
  4. 2d55c74 Parse large floats as infinity (#1349) (#1353) by Tero Kinnunen · 1 year, 6 months ago
  5. 5defb4e Merge pull request #1351 from open-source-parsers/drop-deprecation-warnings by Christopher Dunn · 1 year, 7 months ago 1.9.5


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JSON is a lightweight data-interchange format. It can represent numbers, strings, ordered sequences of values, and collections of name/value pairs.

JsonCpp is a C++ library that allows manipulating JSON values, including serialization and deserialization to and from strings. It can also preserve existing comment in unserialization/serialization steps, making it a convenient format to store user input files.


JsonCpp documentation is generated using Doxygen.

A note on backward-compatibility

  • 1.y.z is built with C++11.
  • 0.y.z can be used with older compilers.
  • 00.11.z can be used both in old and new compilers.
  • Major versions maintain binary-compatibility.

Special note

The branch 00.11.zis a new branch, its major version number 00 is to show that it is different from 0.y.z and 1.y.z, the main purpose of this branch is to make a balance between the other two branches. Thus, users can use some new features in this new branch that introduced in 1.y.z, but can hardly applied into 0.y.z.

Using JsonCpp in your project

The vcpkg dependency manager

You can download and install JsonCpp using the vcpkg dependency manager:

git clone
cd vcpkg
./vcpkg integrate install
./vcpkg install jsoncpp

The JsonCpp port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.

Amalgamated source

The Meson Build System

If you are using the Meson Build System, then you can get a wrap file by downloading it from Meson WrapDB, or simply use meson wrap install jsoncpp.

Other ways

If you have trouble, see the Wiki, or post a question as an Issue.


See the LICENSE file for details. In summary, JsonCpp is licensed under the MIT license, or public domain if desired and recognized in your jurisdiction.