Yii2 custom json response

main.php

'response'=>[
            'format' => yii\web\Response::FORMAT_JSON,
            'class' => 'yii\web\Response',
            'on beforeSend' => function ($event) {

                $response = $event->sender;
                //var_dump($response);
                if ($response->data !== null) {
                    $response->data = [
                        'success' => $response->getIsSuccessful(),
                        'statusCode'=> $response->getStatusCOde(),
                        'data' => $response->data,
                    ];
                    $response->statusCode = 200;
                }
            },
        ],