How to response errors only in json format in Yii2?

Question

As usual, Yii2 shows errors in HTML format in site/error file. How to make all errors returned as JSON format?

Answer 1

You could change the format of your response in a certain action of your controller, for example:

public function actionYourAction($id_survey) {
    \Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
    // return JSON Array or JSON Object here.
}

But in your case, you must first overwrite the error action, as explained here: https://www.yiiframework.com/doc/api/2.0/yii-web-erroraction