public function output() {

		$this->set_query();
		$this->query();

		$this->response = $this->format_response();

		if ( $this->charts ) {
			$this->chart_data = $this->get_chart_data();
		}

		header( 'Content-Type: application/json' );
		echo wp_json_encode( $this );
		wp_die();
	}