api.js

var port = 8001;

var static = require("node-static")
var file = new(static.Server)('./public')

var app = require('http').createServer(function (request, response) {
  request.addListener('end', function () {
    file.serve(request, response)
  });
});

var io = require("socket.io").listen(app)
io.sockets.on("connection", function(socket){
  socket.on("message",function(message){
    console.log(message);
    socket.emit("message", message); // Send message to sender
    socket.broadcast.emit("message", message); // Send message to everyone except sender
  });
  socket.on("share",function(data){
    console.log(data);
    socket.emit("share", data);
    socket.broadcast.emit("share", data); 
  });
});

app.listen(port);