Simple Express app with router endpoint

birds.js

var express = require('express')
var router = express.Router()

// middleware that is specific to this router
router.use(function timeLog (req, res, next) {
  console.log('Time: ', Date.now())
  next()
})
// define the home page route
router.get('/', function (req, res) {
  res.send('Birds home page')
})
// define the about route
router.get('/about', function (req, res) {
  res.send('About birds')
})

module.exports = router

main.js

var birds = require('./birds')
var express = require('express')
var app = express()
app.use('/birds', birds)
app.listen(3000, () => console.log('Example app started'))

package.json

{
  "name": "express-app",
  "version": "1.0.0",
  "description": "",
  "main": "main.js",
  "dependencies": {
    "express": "^4.16.3"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

And if Express is too minimalistic, then Meteor is another option: https://www.meteor.com/