ØMQ/2.2 - The Guide

// Hello World client
// Connects REQ socket to tcp://localhost:5555
// Sends "Hello" to server.

var zmq = require('zmq');

// socket to talk to server
console.log("Connecting to hello world server…");
var requester = zmq.socket('req');

var x = 0;
requester.on("message", function(reply) {
console.log("Received reply", x, ": [", reply.toString(), ']');
x += 1;
if (x === 10) {
requester.close();
process.exit(0);
}
});

requester.connect("tcp://localhost:5555");

for (var i = 0; i < 10; i++) {
console.log("Sending request", i, '…');
requester.send("Hello");
}

process.on('SIGINT', function() {
requester.close();
});