Laravel API - protecting route access

I am building a RESTful Laravel 5.1 API. I only want to allow my frontend Angular app to access certain routes, but currently all the routes are simply exposed.

I was going to use auth middleware to check that my frontend app is authorized to access a route:

    $router->get('/sensitiveData', ['middleware' => 'auth',
        'Resources\Questions@getSensitiveData'
    ]);

But this is good for checking a specific user.

How can I protect my routes such that only specified client apps can access routes? Should I be registering a ClientID somewhere? How can I specify this?

via Chebli Mohamed