This is a JSON-RPC server and client library for node.js <http://nodejs.org/>, the V8 based evented IO framework. Firing up an efficient JSON-RPC server becomes extremely simple: var rpc = require('jsonrpc'); function add(first, second){return first + second} rpc.expose('add', add); rpc.listen(8000, 'localhost'); And creating a client to speak to that server is easy too: var rpc = require('jsonrpc'); var sys = require('sys'); var client = rpc.getClient(8000, 'localhost'); client.call('add', [1, 2], function(result){sys.puts('1 + 2 = ' + result)}); To learn more, see the examples directory, peruse test/jsonrpc-test.js, or simply "Use The Source, Luke". More documentation and development is on its way.