jsonengine is a simple and ultra-scalable JSON storage that works on Google App Engine. You do not need any server-side Java/Python coding. Just deploy a jsonengine to App Engine cloud with your appid, and you can call the REST API from any HTTP client (JavaScript?, Flash, iPhone/iPad/Android or etc) to get/put/search any kind of JSON documents you want to use. http://code.google.com/p/jsonengine