Return JSON from magento controller action

Return JSON from magento controller action

    public function exampleAction(){

    	//create data
    	$arrData = array(
    		'error' => false,
    		'errorMessage' => 'no error'
    	);
    	
    	//Send json
    	$json =  json_encode($arrData);
    	$this->getResponse()->setHeader('Content-type', 'application/json');
    	$this->getResponse()->setBody($json);
    	 
    }