REST API: add new route

Create new routes likes https://wp_url/wp-json/dev/v1/some-endpoint

add_action( 'rest_api_init', 'dev__rest_api_init');

function dev__rest_api_init (){

	register_rest_route(
		'dev/v1',
		'/some-endpoint/',
		array(
			'methods' => 'GET',
			'callback' => 'dev__infos__get',
		)
	);

}

function dev__infos__get() {

	$data = array(...);

	$response = new WP_REST_Response( $data );
	$response->set_status( 200 );

	return $response;

}

Sources:

• https://developer.wordpress.org/rest-api/extending-the-rest-api/adding-custom-endpoints/
• https://developer.wordpress.org/reference/functions/register_rest_route/