The WordPress REST API Plugin is a simple-to-use plugin that allows you to access your WordPress posts, pages and other data via a JSON-based REST API. REST APIs have grown in popularity in recent years because they are fast, platform-independent and easy to integrate.
WordPress is a powerful CMS with a ton of extensible features, so why use the WordPress REST API? I’ll let the authors of the plugin explain:
“WordPress is moving toward becoming a fully-fledged application framework, and we need new APIs. This project was born to create an easy-to-use, easy-to-understand and well-tested framework for creating these APIs, plus creating APIs for core … WP API exposes a simple yet easy interface to WP Query, the posts API, post meta API, users API, revisions API and many more. Chances are, if you can do it with WordPress, WP API will let you do it.”