Basic Wordpress JSON REST API Custom Post Type Example

json-rest-api-custom-post-type.php

<?php

/*
 * Notes:
 *
 * activate the json-rest-api plugin - then add this code to your functions.php file
 *
 * now the following ajax call should work:
 *
jQuery.ajax({
  url : 'http://localhost/wp-json.php/projects',
  type: 'GET',
});
 *
 */

if (class_exists('WP_JSON_CustomPostType'))
{

  class WP_JSON_Projects extends WP_JSON_CustomPostType
  {
    /**
     * Base route name
     *
     * @var string Route base (e.g. /my-plugin/my-type)
     */
    protected $base = '/projects';

    /**
     * Associated post type
     *
     * @var string Type slug
     */
    protected $type = 'projects';

    public function registerRoutes( $routes ) {
      $post_routes = array(
        '/projects'             => array(
          array( array( $this, 'getPosts' ), WP_JSON_Server::READABLE ),
        )
      );
      return array_merge( $routes, $post_routes );
    }

  }/* end class */

  function json_api_project_filters($server) {
    global $wp_json_posts, $wp_json_pages, $wp_json_media, $wp_json_taxonomies;

    $wp_json_projects = new WP_JSON_Projects($server);
    add_filter( 'json_endpoints', array( $wp_json_projects, 'registerRoutes' ), 0 );

  }
  add_action( 'wp_json_server_before_serve', 'json_api_project_filters', 10, 1 );

}/* end if */