function authenticate() {
var form = $('#form-login');
form.submit(function(evt) {
    evt.preventDefault();
    console.log('submitting!');
    console.log(form.serialize());
    $.ajax({
        type: 'POST',
        url: 'http://website.dev/loginz',
        data: form.serialize(),
        dataType: 'json',
        success: function(data) { log_error(data.error); }
    });
});
}

Route::post('loginz', 'UserLoginController@authenticate');

GET http://website.dev/loginz/ 405 (Method Not Allowed)

/* POST */
function authenticate(Request $request) {
    $username = $request->input('username');
    $password = $request->input('password');
    if(Auth::attempt(['username' => $username, 'password' => $password])) {
        redirect()->route('home'); /* should redirect to player */
    }
    return response()->json(['error' => trans('errors.user_password_combination').' => '.$username.' & '.$password]);
}