How to get response as json format(application/json) in yii?

For Yii 1:

Create this function in your (base) Controller:

/** * Return data to browser as JSON and end application. * @param array $data */protected function renderJSON($data){    header('Content-type: application/json');    echo CJSON::encode($data);    foreach (Yii::app()->log->routes as $route) {        if($route instanceof CWebLogRoute) {            $route->enabled = false; // disable any weblogroutes        }    }    Yii::app()->end();}

Then simply call at the end of your action:

$this->renderJSON($yourData);

For Yii 2:

Yii 2 has this functionality built-in, use the following code at the end of your controller action:

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

$this->layout=false;header('Content-type: application/json');echo CJavaScript::jsonEncode($arr);Yii::app()->end(); 

For Yii2 inside a controller:

public function actionSomeAjax() {    $returnData = ['someData' => 'I am data', 'someAnotherData' => 'I am another data'];    $response = Yii::$app->response;    $response->format = \yii\web\Response::FORMAT_JSON;    $response->data = $returnData;    return $response;}