The function type from javascript is not part of the JSON format "officially" (please refer to http://www.json.org) but it is supported as well. Json-lib comes in two flavors, depending on the jdk compatibility. json-lib-x.x-jdk13 is compatible with JDK 1.3.1 and upwards. json-lib-x.x-jdk15 is compatible with JDK 1.5, includes support for Enums in JSONArray and JSONObject. Please reffer to the app