WP API Response does not show my registered metadata

Question

I am trying to get metadata from a custom post type splash_location however it's not showing up in my response. I have registered my metatag splash_location_title but it doesn't show up in my JSON request.

function splash_location_custom_post_type() {
  register_post_type('splash_location',
    array(
      'labels'      => array(
        'name'          => __('Locations', 'textdomain'),
        'singular_name' => __('Location', 'textdomain'),
      ),
      'supports' => array( 'title', 'custom-fields' ),
      'menu_icon'   => 'dashicons-admin-page',
      'public'      => true,
      'has_archive' => true,
      'show_in_rest' => true,
     )
  );
}
add_action('init', 'splash_location_custom_post_type');

$meta_args = array( 
    'type'         => 'string',
    'description'  => 'A meta key associated with a string meta value.',
    'single'       => true,
    'show_in_rest' => true,
);
register_meta( 'splash_location', 'splash_location_title', $meta_args );



//Code in my block file to get splash_location data   
const getLocationPosts = () => axios
    .get('/wp-json/wp/v2/splash_location/')
    .then(response => {
        const { data } = response
        console.log(data)
    })

Answer 1

For posts (Posts, Pages and custom post types), the very first parameter for register_meta() is always post and to set a custom post type, use the object_subtype argument in the third parameter like so:

$meta_args = array(
    'object_subtype' => 'splash_location', // the post type
    'type'           => 'string',
    'description'    => 'A meta key associated with a string meta value.',
    'single'         => true,
    'show_in_rest'   => true,
);
register_meta( 'post', 'splash_location_title', $meta_args );

Or you could instead use register_post_meta() which accepts the post type as the first parameter:

$meta_args = array(
    'type'         => 'string',
    'description'  => 'A meta key associated with a string meta value.',
    'single'       => true,
    'show_in_rest' => true,
);
register_post_meta( 'splash_location', 'splash_location_title', $meta_args );

So in your existing code, you'd simply replace the register_meta with register_post_meta.. 🙂