I've encoded the data from a table in Extjs....using Ext.encode.
In my grails controller, I have something like this:
"members":"[{\"name\":\"A new member\",\"age\":21,\"cover\":\"Single\",\"excess\":\"\",\"term\":\"\",\"plan\":\"\",\"londonUpgrade\":false,\"dob\":\"\",\"world\":false,\"winter\":false,\"business\":false}]"]}