Nodejs Expressjs Config file Development and Production - Service URL Mapping

appConfig.js

module.exports = function(){

    var userServiceURL;
    var blogServiceURL;
    var contentServiceURL;
    switch(process.env.NODE_ENV || 'development'){// other option is export NODE_ENV=development in console
        case 'development':
            userServiceURL = "http://localhost:9000/userService/";
            break;

        case 'production':
            userServiceURL = "http://"
            break;

        default:

    }
     return {

       'userService.ping': userServiceURL+'ping',

    };
};

users.js

var appConfig = require('../config/appConfig'); // configure service api urls in dev/prod/beta
var mappings = appConfig();

// PING
// ==============================================
router.get('/ping', function(req, res){
  request(mappings['userService.ping'], function (error, response, body) {
    if (!error && response.statusCode == 200) {
      res.send(body);
    }
  })
});