wpleeds-custom-endpoints-2.php

<?php

add_action( 'rest_api_init', 'wpleeds_rest_api' );

function wpleeds_rest_api() {

	register_rest_route(
		'wpleeds/v1',
		'^/movies/?$',
		[
			'methods'  => WP_Rest_Server::READABLE,
			'callback' => 'get_movies',
		]
	);

}

function get_movies( WP_REST_Request $request ) {
	return [
		[
			'name'     => 'Rogue One: A Star Wars Story',
			'director' => 'Gareth Edwards',
		],
		[
			'name'     => 'Mad Max: Fury Road',
			'director' => 'George Miller',
		],
	];
}