server.js

var express = require('express');
var bodyParser = require('body-parser');
const mongoose = require('mongoose');
mongoose.connect('mongodb://heroku_m6wr26dg:pliebu3rt9b3l0gcvairtn2nef@ds263500.mlab.com:63500/heroku_m6wr26dg');

var app = express();

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin",
    "https://cs4550-s1-angular-npristin.herokuapp.com");
  res.header("Access-Control-Allow-Headers",
    "Origin, X-Requested-With, Content-Type, Accept");
  res.header("Access-Control-Allow-Methods",
    "GET, POST, PUT, DELETE, OPTIONS");
  res.header("Access-Control-Allow-Credentials", "true");
  next();
});

var session = require('express-session');
app.use(session({
  resave: false,
  saveUninitialized: true,
  secret: 'any string'
}));

app.get('/api/session/set/:name/:value',
  setSession);
app.get('/api/session/get/:name',
  getSession);

function setSession(req, res) {
  var name = req.params['name'];
  var value = req.params['value'];
  req.session[name] = value;
  res.send(req.session);
}

function getSession(req, res) {
  var name = req.params['name'];
  var value = req.session[name];
  res.send(value);
}


var userService = require('./services/user.service.server');
userService(app);

var sectionService = require('./services/section.service.server');
sectionService(app);

var enrollmentService = require('./services/enrollment.service.server');
enrollmentService(app);

var port = process.env.PORT || 4000;
app.listen(port, "0.0.0.0", function() {
console.log("Listening on Port 4000");
});