Introduction

Yes, there are buckets of JSON(http://json.org/) parser. But some of them is so complicated and obscure, though they MAY be perform well. If you write a project like Nginx, do you intend to use a JSON parser which has a heap of code?

json4c is a pretty lightweighted and graceful json parser.

Usage

in json4c, a JSON is represented as a json_t. If JSON is built on a collection of name/value pairs, json_t->object works. If JSON is built on an ordered list of values, json-t->array works.

Steps to using json4c:

• assign JSON value to str, which usually is a char *
• declare json_t: json_t *json_root
• use json_parse(str, &json_root), then json_root stores the JSON value.
• for a JSON name/value pairs, use json_object_get_* functions to get a value from object file; for a JSON ordered list values, use arr->value.* to get value directly.
• use that value
• use json_free(json_root) to free your json_root parser.

usage example: see test_api.c