server.js

var app        = require('express')();
var bodyParser = require('body-parser');
var http       = require('http').Server(app);
var io         = require('socket.io')(http);

// parse application/json
app.use(bodyParser.json({ type : '*/*' })); // force json

app.all('/*', function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Content-Type");
  next();
});

app.get('/', function(req, res){
  res.sendFile(__dirname + '/index.html');
});

app.post('/locations', function(request, response){
    console.log('Headers:\n', request.headers);
    console.log('Locations:\n', request.body);
    console.log('------------------------------');
    io.emit('locations', request.body);
    response.sendStatus(200);
});

app.post('/sync', function(request, response){
    console.log('Headers:\n', request.headers);
    console.log('Synced Locations:\n', request.body);
    console.log('------------------------------');
    io.emit('locations', request.body);
    response.sendStatus(200);
});

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

http.listen(3000, function(){
  console.log('listening on *:3000');
});