socket.io chat

var app = require('http').createServer(handler);
var io = require('socket.io')(app);
var fs = require('fs');

app.listen(80);

    function handler (req, res) {
      fs.readFile(__dirname + '/index.html',
      function (err, data) {
        if (err) {
          res.writeHead(500);
          return res.end('Error loading index.html');
        }

        res.writeHead(200);
        res.end(data);
      });
    }

io.on('connection', function (socket) {
  socket.on("sendMessage", function(data){
    socket.broadcast.emit("displayMessage", {
      name: data.name,
      chatBody: data.body
    });
    socket.emit("displayMessage", {
      name: data.name,
      chatBody: data.body
    })
  });
});