Web App that shows the IP address of the server

Show_IP.js

var http = require('http');
var os = require('os');

var msg = "";
var ifaces = os.networkInterfaces();
Object.keys(ifaces).forEach(function (ifname) {
  ifaces[ifname].forEach(function (iface) {
    if ('IPv4' !== iface.family || iface.internal !== false) {
      // skip over internal (i.e. 127.0.0.1) and non-ipv4 addresses
      return;
    }
    console.log(iface.address);
    msg += iface.address + '\n';
  });
});

var server = http.createServer(function (req, res) {
  res.writeHead(200, {"Content-Type": "text/plain"});
  res.end(msg);
});

server.listen(80);