http://developers.de/blogs/damir_dobric/archive/2009/09/06/wcf-rest-messages-with-json-and-xml-serializer.aspxAssume there is a service called AjaxService with following contract: After starting of the service we would typically create the javascript proxy (helper class) of the REST service by invoking of following URL: http://myservicehost.myservice/ajaxproxyenCommunityServer 2008 SP1 (Build: 30619.63)