.js

/*
  /var/www/app/config/environment.js
*/

module.exports = {
  production:{
      host: 'api.somedomain.io',
      port: 81,
      db: 'db.somedomain.io',
      db_user: 'root',
      db_password: 'adfasdfasdf',
      db_name: 'v1-somedb',
      xmpp_server: 'somedomain.io'
  },
  dev:{
      host: 'api.somedomain.io',
      port: 3000,
      db: 'db.somedomain.io',
      db_user: 'root',
      db_password: 'adfasdfasdf',
      db_name: 'v2-somedb',
      xmpp_server: 'xmpp2.somedomain.io'
  }
};

-----
/*
  /var/www/app/app.js
*/

const environment = require('./config/environment')
var dotenv = require('dotenv');
dotenv.load();


var port = environment.port;  //should return port 81 specified on environment.js