Return JSON response after AJAX call

I'm making an AJAX call, so after the call I need to return some data, but I can't see any data. What's the workaround?

Here's AJAX call:

$('#addDishForm').submit(function(e) {
    e.preventDefault();
    var el = $(this);
    var fromValues = el.serialize();
    $.post('/admin/menu', fromValues, function(data) {                
        console.log(data);
    });
}); 

Here's a route:

Route::middleware('auth')->prefix('/admin')->namespace('Admin')->group(function () {
    // other routes ...
    Route::post('/menu', 'MenuController@store');
    // other routes ...
});

And here's a MenuController and its store() method

public function store(Request $request)
{
    return response()->json($request->all()); 
}

My form is big, so I inlude a part of it:

{!! Form::open([ 'url' => '/menu', 'method' => 'POST', 'files' => 'true', 'id' => 'addDishForm' ]) !!}
    <div class="modal-body">                    
        <div class="form-group">
            
            
        </div>
    </div>
{!! Form::close() !!}

via Chebli Mohamed