text: var express = require('express');
  var router = express.Router();
  
  /* GET Backend Homepage. */
  router.get('/', function(req, res, next) {
    res.render('index.html');
  });
  
  /* GET Backend data. */
  router.get('/da', function(req, res, next) {
    // mock json data
    var data = {
      "msg": "Backend Data"
    };
    res.json(data);
  });
  
  module.exports = router;