What is json-c and how to use it in your projects
JSON (JavaScript Object Notation) is a popular data format for exchanging information between different applications and platforms. It is lightweight, human-readable and easy to parse. However, not all programming languages have built-in support for JSON, and sometimes you may need to use a library to handle JSON data.
One of the libraries that you can use for JSON manipulation in C is json-c. Json-c is an open source project that provides a simple and fast API for creating, parsing, modifying and printing JSON data. In this article, we will show you how to install json-c, how to use it in your C projects, and some of the features and benefits of json-c.
json-c
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How to install json-c
Json-c is available for Linux, Windows and MacOS. You can download the source code from the official GitHub repository or use a package manager to install it on your system. For example, on Ubuntu, you can use the following command:
sudo apt-get install libjson-c-dev
On Windows, you can use vcpkg, a cross-platform package manager for C and C++ libraries. To install json-c using vcpkg, you need to run the following commands:
vcpkg install json-c
vcpkg integrate install
On MacOS, you can use Homebrew, a popular package manager for MacOS. To install json-c using Homebrew, you need to run the following command:
brew install json-c
How to use json-c in your C projects
To use json-c in your C projects, you need to include the header file json.h in your source code. For example:
You also need to link the json-c library to your executable. For example, if you are using gcc, you can use the following option:
-ljson-c
Json-c provides various functions and data structures for working with JSON data. Some of the main ones are:
json_object_new_*: These functions create a new JSON object of a specific type (string, int, double, boolean, array or object).
json_object_get_*: These functions get the value of a JSON object of a specific type (string, int, double, boolean, array or object).
json_object_set_*: These functions set the value of a JSON object of a specific type (string, int, double, boolean, array or object).
json_object_put: This function decrements the reference count of a JSON object and frees it if it reaches zero.
json_object_to_json_string: This function converts a JSON object to a string representation.
json_tokener_parse: This function parses a string into a JSON object.
json_object_array_*: These functions manipulate JSON arrays (get length, get element, add element or put element).
json_object_object_*: These functions manipulate JSON objects (get value by key, add key-value pair or delete key-value pair).
Some features and benefits of json-c
Json-c has some features and benefits that make it a good choice for JSON manipulation in C. Some of them are:
It is simple and easy to use. The API is intuitive and consistent.
It is fast and efficient. It uses reference counting to manage memory allocation and deallocation.
It is portable and cross-platform. It works on Linux, Windows and MacOS.
It is flexible and extensible. It supports custom types and user-defined callbacks.
It is well-documented and well-tested. It has a comprehensive documentation and a test suite that covers most of the functionality.
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