How to Build Multi Auth Laravel 5.2

How to implement Multi Auth in Larvel 5.2. In this example, we use Two table admin and users Laravel 5.2 has a new artisan command.

php artisan make:auth

it will generate basic login/register route, view and controller for user table.
Make a admin table as users table for simplicity.

Controller For Admin

app/Http/Controllers/AdminAuth/AuthController
app/Http/Controllers/AdminAuth/PasswordController

(note: I just copied these files from app/Http/Controllers/Auth/AuthController here)

config/auth.php

//Authenticating guards
'guards' => [
    'user' =>[
        'driver' => 'session',
        'provider' => 'user',
    ],
    'admin' => [
        'driver' => 'session',
        'provider' => 'admin',
    ],
],
//User Providers
'providers' => [
    'user' => [
        'driver' => 'eloquent',
        'model' => App\User::class,
    ],
    'admin' => [
        'driver' => 'eloquent',
        'model' => App\Admin::class,
    ]
],
//Resetting Password
'passwords' => [
    'clients' => [
        'provider' => 'client',
        'email' => 'auth.emails.password',
        'table' => 'password_resets',
        'expire' => 60,
    ],
    'admins' => [
        'provider' => 'admin',
        'email' => 'auth.emails.password',
        'table' => 'password_resets',
        'expire' => 60,
    ],
],  

route.php

Route::group(['middleware' => ['web']], function () {
    //Login Routes...
    Route::get('/admin/login','AdminAuth\AuthController@showLoginForm');
    Route::post('/admin/login','AdminAuth\AuthController@login');
    Route::get('/admin/logout','AdminAuth\AuthController@logout');
    // Registration Routes...
    Route::get('admin/register', 'AdminAuth\AuthController@showRegistrationForm');
    Route::post('admin/register', 'AdminAuth\AuthController@register');
    Route::get('/admin', 'AdminController@index');
});  

AdminAuth/AuthController.php

Add two methods and specify $redirectTo and $guard

protected $redirectTo = '/admin';
protected $guard = 'admin';
public function showLoginForm()
{
    if (view()->exists('auth.authenticate')) {
        return view('auth.authenticate');
    }
    return view('admin.auth.login');
}
public function showRegistrationForm()
{
    return view('admin.auth.register');
}  

it will help you to open another login form for admin.
creating a middleware for admin

class RedirectIfNotAdmin
{
/**
 * Handle an incoming request.
 *
 * @param  \Illuminate\Http\Request  $request
 * @param  \Closure  $next
 * @param  string|null  $guard
 * @return mixed
 */
public function handle($request, Closure $next, $guard = 'admin')
{
    if (!Auth::guard($guard)->check()) {
        return redirect('/');
    }
    return $next($request);
}
}

register middleware in kernel.php

 protected $routeMiddleware = [
    'admin' => \App\Http\Middleware\RedirectIfNotAdmin::class,
];

use this middleware in AdminController e.g.,

namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Auth;
class AdminController extends Controller
{
    public function __construct(){
        $this->middleware('admin');
   }
public function index(){
        return view('admin.dashboard');
    }
}

That's all needed to make it working and also to get json of authenticated admin use

Auth::guard('admin')->user()

Edit - 1
We can access authenticated user directly using
Auth::user() but if you have two authentication table then you have to use

Auth::guard('guard_name')->user()  

for logout

Auth::guard('guard_name')->user()->logout()

for authenticated user json

Auth::guard('guard_name')->user()  

Source.