function create_api_posts_meta_field() {

// register_rest_field ( 'name-of-post-type', 'name-of-field-to-return', array-of-callbacks-and-schema() )
register_rest_field( 'post', 'post-meta-fields', array(
       'get_callback'    => 'get_post_meta_for_api',
       'schema'          => null,

// register_rest_field ( 'name-of-post-type', 'name-of-field-to-return', array-of-callbacks-and-schema() )
register_rest_field( 'achievement', 'post-meta-fields', array(
       'get_callback'    => 'get_post_meta_for_api',
       'schema'          => null,
);function get_post_meta_for_api( $object ) {
//get the id of the post object array
$post_id = $object['id'];

//return the post meta
return get_post_meta( $post_id );}

Please the code above! Tia

  • 1
    Are you trying to add an endpoint to retrieve your posts or add meta to the results? You question and code are about 2 different things. – Jacob Peattie Mar 26 '18 at 9:54
  • Im trying to create an endpoint that will retrieve/show all posts in my custom post type. And I also want to filter it by showing the id and the title(rendered) only. – Ron Ogrimen Mar 26 '18 at 10:19

The "register_rest_field" function will add and handle data update for a given endpoint, looks like it's not what you are looking for.

The register_post_type() function accepts a "show_in_rest" and "rest_base" params if you want to use a custom slug for the endpoint:


By default it uses the WP_REST_Posts_Controller class to handle the methods (get, update, delete content), this means that you can refer to the following documentation:


There are already a few parameters you can pass for filtering (https://developer.wordpress.org/rest-api/reference/posts/#list-posts), but if you want to alter the results/order returned on the GET method to suit your custom needs, you have to pass a custom class for the REST controller param("rest_controller_class") in the register_post_type() function.

  • Thank you for this. I just put ('show_in_rest' => true) on my register_post_type and it works. Thank you again. About filtering the response on my endpoint, I really cant find a solution where I can see only the id and the title of the post. Is there a way that i can use a request like /wp-json/wp/v2/posts?per_page=100 for filtering the id and title? – Ron Ogrimen Mar 27 '18 at 2:39
  • Hi @RonOgrimen, not sure I do understand your question but if the goal is to show only id and title within the REST API response for that endpoint, you should have to use a custom class controller, you can take the posts one as a base(WP_REST_Posts_Controller) and use it for your custom post type. I'd recommend to check the methods for that class if you want to return a custom response and custom sort. – Pabamato Mar 27 '18 at 15:14
  • Did you try the include param?: /wp-json/wp/v2/posts?per_page=100&include=1,2,3,4 also the search, order and order by can help: developer.wordpress.org/rest-api/reference/posts/#arguments – Pabamato Mar 27 '18 at 15:16
  • Thank you @pabamato, I really appreciate it. Right now I need only to show posts by the current date. Is there a request like that? ?search= is not working – Ron Ogrimen Mar 28 '18 at 1:56
  • Did you try using "after" and "before" parameters? You have to pass an ISO 8601 date string as parameter, you can use WordPress built in time function for time formatting: codex.wordpress.org/Formatting_Date_and_Time – Pabamato Mar 29 '18 at 13:53

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