Downgrade process after connecting to port 80

example.js

app.listen(process.env.NODE_ENV === 'production' ? 80 : 8000, function() {
  console.log('Ready');

  // if run as root, downgrade to the owner of this file
  if (process.getuid() === 0)
    require('fs').stat(__filename, function(err, stats) {
      if (err) return console.log(err)
      process.setuid(stats.uid);
    });
});