Get response in JSON format in Yii2

Set

\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;

in the controller's action somewhere before return.

Since Yii 2.0.11 there is a dedicated asJson() method to return a response in JSON format. Run:

return $this->asJson($array);

in your controller action.

Simply Add this in controller

public function beforeAction($action)
{

    \Yii::$app->response->format = Response::FORMAT_JSON;
    return parent::beforeAction($action);
}

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