NodeJS Express Routing

app.js

'use strict';

var router = require('./route');
// var error_hander = require('./error_handler');
var express = require('express');
var app = express();

const PORT = 1337;

app.use('/I/want/title/', router);
app.use('*', redirect_unmatched);

function redirect_unmatched(request, response) {
    response.status(404)        // HTTP status 404: NotFound
    .send('Not found');
}

console.log("listening start");
app.listen(PORT);

package.json

{
  "name": "axiom",
  "version": "1.0.0",
  "description": "basic",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Khizar Manzoor",
  "license": "ISC",
  "dependencies": {
    "cheerio": "^0.20.0",
    "express": "^4.14.0",
    "q": "^1.4.1",
    "request": "^2.74.0"
  }
}

route.js

'use strict'

var q = require("q");
var request_external = require("request");
var cheerio = require("cheerio");
var express = require('express');
var router = express.Router();


const NO_RESPONSE_MESSAGE = "NO RESPONSE";

// middleware that is specific to this router
router.use((req, res, next) => {
  console.log('Time: ', Date.now());

  req.requestTime = Date.now();
  
  next();
});

router.get('/', (request, response) => {
    var query_params = request.query;

    var new_response_obj = {};
    
    if(query_params.hasOwnProperty('address'))
    {
        var addresses = query_params['address'];
        
        var promise_arr = [];

        for(var i = 0, len = addresses.length; i < len; i++)
        {
            var url = validate_url(addresses[i])
            
            promise_arr.push(get_title(url));
        }

        q.all(promise_arr).then( values => {

            for(var i = 0, len = values.length; i < len; i++) {
                values[i] = '<li>' + values[i] + '</li>';
            }
            
            new_response_obj.data = values;

            response.send(new_response_obj);

        });
    }

  // res.send('dir 1 Birds home pasge');
});

function get_title(url)
{
    var defer = q.defer();
    
    request_external(url, {method: 'GET'}, function(error, response, body) {
        var title = '';

        if(response) {
            if(response.statusCode === 200) {
                
                title = extract_title_from_html(body);
                
                if(title)
                {
                    title = url + ' - ' + title;
                    defer.resolve(title);
                }
                else
                {
                    title = url + ' - ' + NO_RESPONSE_MESSAGE;
                    
                    defer.resolve(title);
                }
            }
            else
            {
                title = url + ' - ' + NO_RESPONSE_MESSAGE;
                
                defer.resolve(title);
            }
        }
        else
        {
            title = url + ' - ' + NO_RESPONSE_MESSAGE;
                
            defer.resolve(title);
        }
    });

    return defer.promise;
}

function validate_url(url)
{
    if(url.indexOf('http') || url.indexOf('https') == -1)
    {
        url = 'http://' + url;
    }

    return url;
}

function extract_title_from_html(html_str)
{
    var $ = cheerio.load(html_str),
        title = $("title");

    title = title.html();
    
    return title;
}

module.exports = router;