Login Form with Ajax using Laravel 5.2

I try to create login form with Ajax using Laravel 5.2 Auth.

$(document).ready(function(){$.ajaxSetup({  headers: {'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')  }});$('#login').on('click',function(e){e.preventDefault(); var formData = {    email: $('#email').val(),    password: $('#password').val(),}    $.ajax({        type: "POST",        url: "/login",        data: formData,        success: function (data) {           location.reload();        },        error: function (data) {        }    });});})enter code here

Laravel default login function:

public function login(Request $request){$this->validateLogin($request);// If the class is using the ThrottlesLogins trait, we can automatically throttle// the login attempts for this application. We'll key this by the username and// the IP address of the client making these requests into this application.$throttles = $this->isUsingThrottlesLoginsTrait();if ($throttles && $lockedOut = $this->hasTooManyLoginAttempts($request)) {    $this->fireLockoutEvent($request);    return $this->sendLockoutResponse($request);}$credentials = $this->getCredentials($request);if (Auth::guard($this->getGuard())->attempt($credentials, $request->has('remember'))) {    return $this->handleUserWasAuthenticated($request, $throttles);}// If the login attempt was unsuccessful we will increment the number of attempts// to login and redirect the user back to the login form. Of course, when this// user surpasses their maximum number of attempts they will get locked out.if ($throttles && ! $lockedOut) {    $this->incrementLoginAttempts($request);}return $this->sendFailedLoginResponse($request);}

/login return index page as a response. I need json response about error messages or success message. It is said that changing Laravel core functions is not advisable. Then how can I get it?