ZeroMQ rep socket example for node.js

responder.js

var zmq = require('zmq');

var responder = zmq.socket('rep');

responder.on('message', function(payload)
{
	var data = JSON.parse(payload);
	var response = {};
	var keys = Object.keys(data);
	for (var i = 0; i < keys.length; i++)
	{
		response[data[keys[i]]] = keys[i];
	}
	
	responder.send(JSON.stringify(response));
});

var endpoint = 'tcp://127.0.0.1:3010';
responder.connect(endpoint);
console.log('listening on ' + endpoint);