The WP Rest API sends the total count(found_posts) property from WP_Query. in a header called X-WP-Total. FOR POSTS: you can make a call to posts endpoint of the REST API http://demo.wp-api.org/wp-json/wp/v2/posts The value for posts count is returned in the header as X-WP-Total. Below is a sample response from the hosted demo Access-Control-Allow-Headers:Authorization, Content-Type Access-Control-Expose-Headers:X-WP-Total, … Read more
You can use $request->get_json_params() which will return an array of key => values. With these conditions(possibly a few more): The client sending the request has Content-Type: application/json in the header There is a raw body like {“option”:”siteColor”,”value”:”ff0000″}. https://developer.wordpress.org/reference/classes/wp_rest_request/get_json_params/
There is a navigation menu plugin extension for the REST API v2: https://wordpress.org/plugins/wp-api-menus/
Is this meant to be used on sites in production? Yes. Many sites have been already using it. Is there a security risk to allowing endpoints to be viewed by anyone, such as /wp-json/wp/v2/users/ which shows all users registered to the site? No. Server responses have nothing to do with security, nothing you can do … Read more