Disable WordPress REST API

Easily disable the WP REST API on your website with this snippet.

<?php
add_filter(
 'rest_authentication_errors',
 function ( $access ) {
  return new WP_Error(
   'rest_disabled',
   __( 'The WordPress REST API has been disabled.' ),
   array(
    'status' => rest_authorization_required_code(),
   )
  );
 }
);