index.js

var express = require('express');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var dbManager = require('./database_manager.js');

app.set('port', (process.env.PORT || 5000));

app.use(express.static(__dirname + '/public'));

// views is directory for all template files
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');

app.get('/', function(request, response) {
  response.render('pages/index');
});

io.on('connection', function(socket){

  var callback = (params) => {
    params.forEach(function(element) {
      socket.emit('update', element);
    }, this);
  };
  dbManager.getAll(callback);

  socket.on('update', function (params) {

    var data = JSON.stringify(params);
    data = data.replace(">", ">");
    params = JSON.parse(data);
    console.log(params);
    //db update
    dbManager.update({key: params.uuid}, params);
    socket.broadcast.emit('update', params);
  });

});

http.listen(app.get('port'), function() {
  console.log('Node app is running on port', app.get('port'));
});