cakephp3でjsonを返すAPIを作る

config/routes.phpに

$routes->extensions([‘json’]);
を追加。

jsonを返すアプリケーション名を指定する
$routes->resources(‘Users’);
$routes->resources(‘Parts’);

[参考]
http://book.cakephp.org/3.0/en/development/routing.html#resource-routes