gistfile1.js

var app = require('./app');
var http = require('http').Server(app);
var io = require('socket.io')(http);

var port = 3000;

io.on('connection', function(socket) {
  console.log("A user connected.");
});

io.on('message', function(data) {
  // not seeing this in the server console
  console.log('received message');
});

http.listen(port, function(err, res) {
  console.log("Listening on port " + port);
});

gistfile2.js

$(document).ready(function () {
  var socket = io();

  $('#send').click(function (event) {
    // I am seeing this in the client console
    console.log("Send button clicked.");
    var data = {}; 
    data.message = $('#message-box').val();
    data.nickname = 'billy';
    socket.emit('message', data);
    $('#message-box').val("");
  }); 

  socket.on('receive-message', function(data) {
    $('chat-window').append("<div>"+data.nickname+": "+data.message+"</div>");
  }); 
});