A lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language. -- From Introducing JSON

Many high-level languages already provide native modules for parsing, generating and manipulating JSON data streams. JSON-GLib is a C library based on GLib and released under the terms of the GNU Lesser General Public License version 2.1. It provides a parser and a generator GObject classes and various wrappers for the complex data types employed by JSON, such as arrays and objects.

JSON-GLib uses GLib native data types and the generic value container GValue for ease of development. It also provides integration with the GObject classes for direct serialization into, and deserialization from, JSON data streams.