WP Disable Rest API

disable-rest-api.php

<?php
/*
 * Disable WP REST API JSON endpoints if user not logged in
 */
function chuck_disable_rest_endpoints( $access ) {
	if( ! is_user_logged_in() ) {
		return new WP_Error( 'rest_cannot_access', __( 'Only authenticated users can access the REST API.', 'disable-json-api' ), array( 'status' => rest_authorization_required_code() ) );
	}
  return $access;
}
add_filter( 'rest_authentication_errors', 'chuck_disable_rest_endpoints' );


/*
 * Diable WP Rest API completly
 */
add_filter('rest_enabled', '_return_false');
add_filter('rest_jsonp_enabled', '_return_false');


/*
 * Diable WP Rest URI from Head
 */
remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );
remove_action( 'wp_head', 'wp_oembed_add_discovery_links', 10 );