tcp.js

var net = require('net');
var clients = [];

var server = net.createServer(function(socket) {

  //add any incoming socket to a clients array
  clients.push(socket);

  socket.on('data', function (data) {
    //iterate over a list of clients and send data
    for(var i = 0; i < clients.length; i++) {
      clients[i].write(data);
    }
  });

    socket.on('end', function() {
      var i = clients.indexOf(socket)
      clients.splice(i,1);
    });


});

server.listen(8000);