3 NodeJS implementations of Polls API in KoaJS, ExpressJS and Hapi. All implementations are tested by Dredd.

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