Support for json rpc 2.0 based on http://www.jsonrpc.org/specification.
npm install jsonrpc-simple
req = '{"jsonrpc": "2.0", "method": "sum", "params": [1, 2, 4], "id": 1}'
services =
sum: (a, args...) ->
for i in args then a += i
return a
res = JSONRPC.handleRequest(req, services)
console.log res
# displays {"jsonrpc": "2.0", "result": 7, "id": "1"}