Part of an experimental Node.js configuration file

config.js

var normalizePort = require('./../../utils').normalizePort,
    _defaults = [

        /*"NODE_ENV",*/
        "HOST",
        "PORT"

    ];

_defaults.forEach(function (name) {
    'use strict';

    if (!process.env[name]) {
        throw new Error('Environment variable ' + name + ' is missing');
    }
});

var config = {
    env: process.env.NODE_ENV,
    server: {
        host: process.env.HOST || 'http://127.0.0.1',
        port: normalizePort(process.env.PORT || 8080)
    }
};

module.exports = config;