Index: Classes/ViewHelpers/EscapeViewHelper.php
===================================================================
--- Classes/ViewHelpers/EscapeViewHelper.php	(revision 3781)
+++ Classes/ViewHelpers/EscapeViewHelper.php	(working copy)
@@ -47,6 +47,13 @@
  * Text encoded for URL use (rawurlencode applied).
  * </output>
  *
+ * <code title="JSON">
+ * <f:escape type="json">{text}</f:escape>
+ * </code>
+ * <output>
+ * Text encoded as json string (json_encode applied).
+ * </output>
+ *
  * @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License, version 3 or later
  * @api
  */
@@ -84,6 +91,8 @@
 			break;
 			case 'url':
 				return rawurlencode($value);
+			case 'json':
+				return json_encode($value);
 			default:
 				return $value;
 			break;