wpleeds-custom-endpoints-3.php

<?php

add_action( 'rest_api_init', 'wpleeds_rest_api' );

function wpleeds_rest_api() {

	register_rest_route(
		'wpleeds/v1',
		'/movies/(?P<name>.+)/?$',
		[
			'methods'  => WP_Rest_Server::READABLE,
			'callback' => 'get_movie',
		]
	);

}

function get_movie( WP_REST_Request $request ) {
	return [
		'name'     => 'Mad Max: Fury Road',
		'director' => 'George Miller',
	];
}