How to reate a sub domain for each user

subdomain_for_every_user.js

/**
*  dynamic A record
*  eg. *.domain.com points to domain.com?  
*  then in your router
* 
*  source: https://github.com/bmullan91/express-subdomain/issues/26#issuecomment-225441455
*/


// get your dynamic subdomain
app.use(function(req, res, next) {
  if (!req.subdomains.length || req.subdomains.slice(-1)[0] === 'www') return next();
  // otherwise we have subdomain here
  var subdomain = req.subdomains.slice(-1)[0];
  // keep it
  req.subdomain = subdomain;
  next();
});


// render a page
app.get('/', function(req, res) {
  // no subdomain
  if (!req.subdomain) {
    // render landing page
    res.render('home');
  } else {
    // render subdomain specific data
    res.render('user-page', { subdomain: req.subdomain });
  }
});