laravel/app/Exceptions/Handler.php

<?php

namespace App\Exceptions;

use Exception;
use Illuminate\Auth\AuthenticationException;
use Illuminate\Validation\ValidationException;
use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;

class Handler extends ExceptionHandler
{
    /**
     * A list of the exception types that should not be reported.
     *
     * @var array
     */
    protected $dontReport = [
        //
    ];

    /**
     * Report or log an exception.
     *
     * This is a great spot to send exceptions to Sentry, Bugsnag, etc.
     *
     * @param  \Exception  $exception
     * @return void
     */
    public function report(Exception $exception)
    {
        parent::report($exception);
    }

    /**
     * Render an exception into an HTTP response.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Exception  $exception
     * @return \Illuminate\Http\Response
     */
    public function render($request, Exception $exception)
    {
        return parent::render($request, $exception);
    }

    /**
     * Convert a validation exception into a response.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  Illuminate\Validation\ValidationException  $exception
     * @return \Illuminate\Http\Response
     */
    protected function invalid($request, ValidationException $exception)
    {
        $errors = $exception->validator->errors()->messages();

        return $request->expectsJson()
                    ? response()->json(['message' => $exception->getMessage(), 'errors' => $errors], 422)
                    : redirect()->back()->withInput()->withErrors(
                            $errors, $exception->errorBag
                      );
    }

    /**
     * Convert an authentication exception into a response.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Illuminate\Auth\AuthenticationException  $exception
     * @return \Illuminate\Http\Response
     */
    protected function unauthenticated($request, AuthenticationException $exception)
    {
        return $request->expectsJson()
                    ? response()->json(['message' => 'Unauthenticated.'], 401)
                    : redirect()->guest(route('login'));
    }
}