Node Express app example with basic functionalities

app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var session = require('express-session');
var validator = require('express-validator');
var csrf = require('csurf');

var index = require('./routes/index');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(validator());
app.use(session({
    secret: "mykey"
}));
app.use(csrf({ cookie: true }));

app.use('/', index);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

app.listen(5000, () => console.log("Listening to port 5000"));
module.exports = app;

index.js

var express = require('express');

var router = express.Router();

/* generate token and store in session */
router.get('/', function(req, res, next) {
    req.session.csrfToken = req.csrfToken();
    
    /* destroy session */
    //req.session.csrfToken = null;
    
});

/* set and get cookie */
router.get('/cookie', function(req, res) {
    //Set cookie which expires after 360000 ms from the time it is set.
    res.cookie('cookie_name', 'my value', {maxAge: 360000});
    console.log('Cookies: ', req.cookies['cookie_name']);
    
    /* clear cookie  */
    //res.clearCookie('cookie_name');
});

module.exports = router;