Target class [HomeController] does not exist

• Import controller and define route in web.php in laravel 8

  --PATH routes\web.php

  use App\Http\Controllers\HomeController;
  Route::get('/home', [HomeController::class, 'index'])->name('home');
  
  // or
  
  Route::get('/home', 'App\Http\Controllers\HomeController@index');
  

  As per the new version in laravel (laravel 8) first, you need to import the controller file in your web.php file and after that, you can call the controller method. Laravel 8 has changed the way of calling the controller and its method. You can't call the controller with the "HomeController@index" method.

• Use old routing way using RouteServiceProvider.php in laravel 8

  --PATH app/providers/RouteServiceProvider.php

  <!-- Uncomment code from -->
  // protected $namespace = 'App\\Http\\Controllers';
  <!-- To --> 
  protected $namespace = 'App\\Http\\Controllers';
  

  If you want to use old routing ways (Route::get('/home', 'HomeController@index')->name('home');) which are used in laravel < = 7 version. You have to remove comment // protected $namespace = 'App\\Http\\Controllers'; from RouteServiceProvider.php file.

• Use protected $namespace = 'App\\Http\\Controllers'; in app\Providers\RouteServiceProvider.php

  --PATH app\Providers\RouteServiceProvider.php

  protected $namespace = 'App\Http\Controllers';
  public function boot()
  {
      $this->configureRateLimiting();
  
      $this->routes(function () {
          Route::prefix('api')
              ->middleware('api')
              ->namespace($this->namespace)
              ->group(base_path('routes/api.php'));
  
          Route::middleware('web')
              ->namespace($this->namespace)
              ->group(base_path('routes/web.php'));
      });
  }
  

  Code after changes in app\Providers\RouteServiceProvider.php file

  class RouteServiceProvider extends ServiceProvider
  {
      /**
       * The path to the "home" route for your application.
       *
       * This is used by Laravel authentication to redirect users after login.
       *
       * @var string
       */
      protected $namespace = 'App\Http\Controllers';
      public const HOME = '/home';
  
      
  
      /**
       * Define your route model bindings, pattern filters, etc.
       *
       * @return void
       */
      public function boot()
      {
          $this->configureRateLimiting();
  
          $this->routes(function () {
              Route::prefix('api')
                  ->middleware('api')
                  ->namespace($this->namespace)
                  ->group(base_path('routes/api.php'));
  
              Route::middleware('web')
                  ->namespace($this->namespace)
                  ->group(base_path('routes/web.php'));
          });
      }

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