how to set baseUrl in my config file node.js

Question

var path = require('path');
module.exports = {
    site: {
        contactEmail: '[email protected]',
        baseUrl: "http://localhost:3000/",
        uploadPath: path.join(__dirname, '../public'),
        language:'en'
    },
    mongodb: {
         url: 'mongodb://localhost:27017/psp',
    }
}

I have set static baseUrl in my config file in node.js.How can I do dynamic in different servers?

like:-

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

http.createServer(function (req, res) {
  var hostname = req.headers.host; // hostname = 'localhost:8080'
  var pathname = url.parse(req.url).pathname; // pathname = '/MyApp'
  console.log('http://' + hostname + pathname);

  res.writeHead(200);
  res.end();
}).listen(8080);

var hostname = req.headers.host; // hostname = 'localhost:8080'

i want this type of output in my config file.

Answer 1

As all we know module.exports return a javascript object. so we can use get/set property for changing the value of any property of object.

module.exports={
  baseUrl : "/xyz",
  setBaseUrl : function(url){
    this.baseUrl = url;
  }
  getBaseUrl : function(){
    return this.baseUrl;
  }
}

var http = require('http');
var url = require('url') ;
var config = require('path/to/your/configFile');

http.createServer(function (req, res) {
  var hostname = req.headers.host; // hostname = 'localhost:8080'
   config.setBaseUrl(hostname);
  var pathname = url.parse(req.url).pathname; // pathname = '/MyApp'
  console.log('http://' + congif.getBaseUrl() + pathname);

  res.writeHead(200);
  res.end();
}).listen(8080);