nodesec-sudo-node.js

var express = require('express');
var http = require('http');
var app = express();

/*define routes here*/

var server = http.createServer(app);

server.listen(80, function(err){
  if (err) {
    console.log('error occurred trying to listen on port 80');
    return;
  }
  
  var uid = parseInt(process.env.SUDO_UID); //get the UID of user who started application as sudo
  
  if (uid) {
    process.setuid(uid); //set uid of the process to user with lower privileges
  }
  
});