Node.js - Add authentication to OpenVPN (.ovpn) files

ovpnAuth.js

var fs = require("fs");
var glob = require("glob");
glob('*.ovpn', function (err, files) {
     if (err) { throw err; }
     files.forEach(function(item,index,array){
          // Each .ovpn file will use login.conf containing un and pw
          fs.appendFile(item, ' auth-user-pass login.conf', function (err) {});
     });
});