diff --git a/backend/lib/View/JSON.php b/backend/lib/View/JSON.php
index 4d34745..86db8e5 100644
--- a/backend/lib/View/JSON.php
+++ b/backend/lib/View/JSON.php
@@ -47,30 +47,29 @@ class JSON extends View {
 	/**
 	 * constructor
 	 */
-	public function __construct(HTTP\Request $request, HTTP\Response $response, $padding = FALSE) {
+	public function __construct(HTTP\Request $request, HTTP\Response $response) {
 		parent::__construct($request, $response);
 
 		$this->json = new Util\JSON();
 		$this->json['source'] = 'volkszaehler.org';
 		$this->json['version'] = VZ_VERSION;
 
-		$this->setPadding($padding);
-
-		$this->response->setHeader('Content-type', 'application/json');
+		$this->setPadding($request->getParameter('padding'));
 	}
 
 	public function addChannel(Model\Channel $channel, array $data = NULL) {
 		$jsonChannel = self::convertEntity($channel);
+		$jsonChannel['type'] = $channel->getType();
 
 		if (isset($data)) {
 			$jsonChannel['data'] = self::convertData($data);
 		}
 
-		$this->json['channels'][] = $jsonChannel;
+		$this->json['channel'] = $jsonChannel;
 	}
 
 	public function addAggregator(Model\Aggregator $aggregator, $recursive = FALSE) {
-		$this->json['groups'][] = self::convertAggregator($aggregator, $recursive);
+		$this->json['group'] = self::convertAggregator($aggregator, $recursive);
 	}
 
 	public function addDebug(Util\Debug $debug) {
@@ -108,8 +107,8 @@ class JSON extends View {
 		$jsonEntity = array();
 		$jsonEntity['uuid'] = (string) $entity->getUuid();
 
-		foreach ($entity->getProperties() as $property) {
-			$jsonEntity[$property->getName()] = $property->getValue();
+		foreach ($entity->getProperties() as $key => $value) {
+			$jsonEntity[$key] = $value;
 		}
 
 		return $jsonEntity;
@@ -123,10 +122,10 @@ class JSON extends View {
 		}
 
 		if ($recursive) {
-			$jsonAggregator['children'] = array();
+			$jsonAggregator['groups'] = array();
 
 			foreach ($aggregator->getChildren() as $subAggregator) {
-				$jsonAggregator['children'][] = $this->toJson($subAggregator, $recursive);	// recursion
+				$jsonAggregator['groups'][] = $this->toJson($subAggregator, $recursive);	// recursion
 			}
 		}
 
@@ -134,26 +133,21 @@ class JSON extends View {
 	}
 
 	protected static function convertData($data) {
-		$jsonData = array();
+		array_walk($data, function(&$reading) {
+			$reading[1] = round($reading[1], View::PRECISSION);
+		});
 
-		foreach ($data as $reading) {
-			$jsonData[] = array(
-				(int) $reading[0],
-				(float) round($reading[1], View::PRECISSION),
-				(int) $reading[2]
-			);
-		}
-
-		return $jsonData;
+		return $data;
 	}
 
-	public function renderResponse() {
+	public function render() {
 		$json = $this->json->encode((Util\Debug::isActivated()) ? JSON_PRETTY : 0);
 
 		if ($this->padding) {
 			$json = 'if (self.' . $this->padding . ') { ' . $this->padding  . '(' . $json . '); }';
 		}
 
+		$this->response->setHeader('Content-type', 'application/json');
 		echo $json;
 	}
 
diff --git a/backend/lib/View/JpGraph.php b/backend/lib/View/JpGraph.php
index 7b39a5e..108dba9 100644
--- a/backend/lib/View/JpGraph.php
+++ b/backend/lib/View/JpGraph.php
@@ -48,8 +48,8 @@ class JpGraph extends View {
 
 	protected $channels = array();
 
-	protected $width = 800;
-	protected $height = 400;
+	const WIDTH = 800;
+	const HEIGHT = 400;
 
 	protected static $colors = array('chartreuse', 'chocolate1', 'cyan', 'blue', 'lightcyan4', 'gold');
 
@@ -64,7 +64,10 @@ class JpGraph extends View {
 	public function __construct(HTTP\Request $request, HTTP\Response $response, $format = 'png') {
 		parent::__construct($request, $response);
 
-		$this->graph = new \Graph($this->width,$this->height);
+		$width = $this->request->getParameter('width') ? $this->request->getParameter('width') : self::WIDTH;
+		$height = $this->request->getParameter('height') ? $this->request->getParameter('height') : self::HEIGHT;
+
+		$this->graph = new \Graph($width, $height);
 
 		$this->graph->img->SetImgFormat($format);
 
@@ -125,7 +128,7 @@ class JpGraph extends View {
 			$this->channels[] = $channel;
 		}
 		else {
-			throw new \Exception('can\'t plot channels without data!');
+			throw new \Exception('Can\'t plot channels without data!');
 		}
 	}
 
diff --git a/backend/lib/View/View.php b/backend/lib/View/View.php
index 4cd2d32..26da2a5 100644
--- a/backend/lib/View/View.php
+++ b/backend/lib/View/View.php
@@ -28,25 +28,13 @@ use Volkszaehler\View\HTTP;
 use Volkszaehler\Util;
 
 /**
- * Interface for all View classes
- *
- * @author Steffen Vogel <info@steffenvogel.de>
- * @package default
- */
-interface ViewInterface {
-	public function addChannel(Model\Channel $channel, array $data = NULL);
-	function addAggregator(Model\Aggregator $aggregator);
-	function addDebug(Util\Debug $debug);
-}
-
-/**
- * Superclass for all view classes
+ * Base class for all view formats
  *
  * @package default
  * @author Steffen Vogel <info@steffenvogel.de>
  *
  */
-abstract class View implements ViewInterface {
+abstract class View {
 	/**
 	 * @var integer round all values to x decimals
 	 */
@@ -79,6 +67,11 @@ abstract class View implements ViewInterface {
 		set_error_handler(array($this, 'errorHandler'));
 	}
 
+	public function __desctruct() {
+		restore_exception_handler();
+		restore_error_handler();
+	}
+
 	/**
 	 * error & exception handling
 	 */
@@ -91,22 +84,52 @@ abstract class View implements ViewInterface {
 
 		$code = ($exception->getCode() == 0 && HTTP\Response::getCodeDescription($exception->getCode())) ? 400 : $exception->getCode();
 		$this->response->setCode($code);
-		$this->sendResponse();
+		$this->send();
 
 		die();
 	}
 
-	public function sendResponse() {
+	public function send() {
 		if (Util\Debug::isActivated()) {
 			$this->addDebug(Util\Debug::getInstance());
 		}
 
-		$this->renderResponse();
+		$this->render();
 		$this->response->send();
 	}
 
-	protected abstract function renderResponse();
+	/**
+	 *
+	 * @param mixed $data
+	 */
+	public function add($data) {
+		if (isset($data)) {
+			if (is_array($data)) {
+				array_walk($data, array($this, 'add'));
+			}
+			else {
+				if ($data instanceof Model\Channel) {
+					$this->addChannel($data);
+				}
+				elseif ($data instanceof Model\Aggregator) {
+					$this->addAggregator($data);
+				}
+				elseif ($data instanceof \Exception) {
+					$this->addException($data);
+				}
+				elseif ($data instanceof Util\Debug) {
+					$this->addDebug($data);
+				}
+				else {
+					throw new \Exception('Can\'t show ' . get_class($data));
+				}
+			}
+		}
+	}
+
+	protected abstract function render();
 	protected abstract function addException(\Exception $exception);
+	protected abstract function addDebug(Util\Debug $debug);
 }
 
 ?>