PHP

laravel success message

//If it didn't help (still, keep routes.php without web middleware), you can try little bit different approach:

return redirect()->back()->with('message', 'IT WORKS!');
// Displaying message if it exists:

@if(session()->has('message'))
    <div class="alert alert-success">
        {{ session()->get('message') }}
    </div>
@endif

return with success message laravel

 return redirect()->route('agent')->with(
            'success', __('Agent successfully added!')
        );

 return redirect()->back()->with('error', __('Permission Denied.'));

laravel success message

...
$recipe->save();
$data = [
  'success' => true,
  'message'=> 'Your AJAX processed correctly'
] ;

return response()->json($data);