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Have you tried these? for server-side (GAE) *com.google.appengine.repackaged.org.json.JSONObject.JSONObject(String arg0)* for client *com.google.gwt.json.client.JSONParser* I haven't tried japanese or chinese characters though, rather stuff like this: "Příliš žluťoučký kuň úpěl ďábělské ódy"

you could leverage Entity's getProperties() method, in combination with JSON-lib's groovy-friendliness and ability to serialize maps as JSON. So, say you have an Entity: def person = new Entity("person") person.name = "Guillaume Laforge" def jsonString = person.properties as JSONObject Have a look at JSON-lib and the Entity JavaDoc. And I think it'll solve your problem pretty neatly!

! In this blog post we learn how easy it is to deploy a simple Groovlet to the Google Appengine and how easy it is to parse JSON results.