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Now, let's see tutorial of How to override auth login function in laravel 8. We will look at example of laravel override login method. This article will give you simple example of laravel fortify custom login. I’m going to show you about auth login function in laravel. Let's see bellow example laravel custom login function.

Sometime we need to overwrite or custom code for login method, so here i will give you very simple example how to overwrite auth default login function in laravel app.

You can see bellow default route for login post method:

Route::post('login', 'Auth\LoginController@login');

so, Basically you can create new method login into your LoginController and override auth method. let's add code as like bellow:

app/Http/Controllers/Auth/LoginController.php

<?php
  
namespace App\Http\Controllers\Auth;
  
use App\Http\Controllers\Controller;
use App\Providers\RouteServiceProvider;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Http\Request;
use Auth;
   
class LoginController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles authenticating users for the application and
    | redirecting them to your home screen. The controller uses a trait
    | to conveniently provide its functionality to your applications.
    |
    */
  
    use AuthenticatesUsers;
  
    /**
     * Where to redirect users after login.
     *
     * @var string
     */
    protected $redirectTo = RouteServiceProvider::HOME;
   
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }
  
     /**
     * Write code on Method
     *
     * @return response()
     */
    public function login(Request $request)
    {
        $request->validate([
            'email' => 'required',
            'password' => 'required',
        ]);
     
        $credentials = $request->only('email', 'password');
        if (Auth::attempt($credentials)) {
  
            return redirect()->route('home');
        }
    
        return redirect("login")->withSuccess('Oppes! You have entered invalid credentials');
    }
}

i hope it can help you....