Function for WordPress that creates custom endpoint to return menu using WP-Rest-API

wp-api-get-menu.php

<?php
/**
 * Custom REST API Endpoint: Get Menu
 * Gist Keywords: wordpress, rest, api
 * 
 * @category   WordPress
 * @author     Knol Aust
 * @version    1.0.0
 * @description Retrieves a WordPress menu using a custom REST API endpoint.
 */

function custom_rest_get_menu() {
    # Change 'menu' to your own navigation slug.
    return wp_get_nav_menu_items('menu');
}

add_action( 'rest_api_init', function () {
    // Registers a custom route to retrieve the menu via the REST API
    register_rest_route( 'myroutes', '/menu', array(
        'methods' => 'GET',
        'callback' => 'custom_rest_get_menu',
    ) );
} );