all errors and exceptions, both custom and default, are handled by the Handler class in app/Exceptions/Handler.php with the help of two methods.

• report()

• render()

  public function render($request, Exception $e)
  {
   //check if exception is an instance of ModelNotFoundException.
   if ($e instanceof ModelNotFoundException)
   {
       // ajax 404 json feedback
       if ($request->ajax())
       {
           return response()->json(['error' => 'Not Found'], 404);
       }
       // normal 404 view page feedback
       return response()->view('errors.missing', [], 404);
    }
     return parent::render($request, $e);
  }
  

then create view related to error in errors folder named 404.blade.php

User not found.

You broke the balance of the internet