This document compares three Node.js frameworks: Express, Koa, and Hapi, highlighting their GitHub stars, contributors, and weekly downloads. It includes sample code for setting up servers and handling routes in each framework, along with testing using Dredd. Additionally, it mentions hosting the project on GitHub and suggestions for improvements.

1. Comparison NodeJS
frameworks
ladislav@prskavec.net
@abtris
www.praguejs.cz
@jsconfcz

3. express koa hapi
github stars 18861 6174 4228
contributors 178 59 116
downloads / w 525941 8769 11966
stack overflow 14853 138 66
npm -ls | wc -l 48 36 48
file size 3896 2000 50392

4. http://docs.nodeschoolhk.apiary.io/

5. https://github.com/apiaryio/dredd

6. Init server

7. "express": "^4.12.3"
(function() {
'use strict';
var express = require('express');
var app = express();
app.set('json spaces', 2);
....
var server = app.listen(3003, function() {
var host = server.address().address;
var port = server.address().port;
console.log('Example app listening at http://%s:%s', host, port);
});
}());

8. "hapi": "^8.4.0"
var Hapi = require('hapi');
var server = new Hapi.Server();
server.connection({port: 3001});
....
// Start the server
server.start(function() {
console.log('Server running at:', server.info.uri);
});

9. "koa": "^0.20.0"
"use strict";
var koa = require('koa');
var route = require('koa-route');
var app = koa();
require('koa-qs')(app);
....
app.listen(3000);

10. Routing

11. "express": "^4.12.3"
app.get('/questions/:question_id', function(req, res) {
res.status(200).json({"question":"Favourite programming language?"...}]});
});
app.post('/questions/:question_id/choices/:choice_id', function(req, res) {
res.set('Location', '/questions/' + req.params.question_id);
res.status(201).send('');
});

12. "hapi": "^8.4.0"
server.route({
method: 'GET',
path: '/questions/{question_id}',
handler: function(request, reply) {
reply({"question":"Favourite programming language?"...});
}
});
server.route({
method: 'POST',
path: '/questions/{question_id}/choices/{choice_id}',
handler: function(request, reply) {
reply().code(201).header('Location', '/questions/' + request.params.question_id);
}
});

13. "koa": "^0.20.0"
app.use(route.get('/questions/:question_id', function *(question_id) {
this.body = {"question":"Favourite programming language?"...};
}));
app.use(route.post('/questions/:question_id/choices/:choice_id', function *(question_id,
choice_id) {
this.status = 201;
this.set('Location', '/questions/' + question_id);
this.body = '';
}));

14. Testing
• Dredd
var hooks = require('hooks');
var before = hooks.before;
hooks.beforeEach(function(transaction) {
if (transaction.expected.headers['Content-Type'] == 'application/json') {
transaction.expected.headers['Content-Type'] = 'application/json; charset=utf-8';
}
});

15. Github repository of project:
https://github.com/abtris/nodeschool-hk-2015-05-23
Ideas how project improve:
• you can fork and contribute
• you can try add 404, 500 pages
• you can try persistent layer using Redis