Node.js is a popular JavaScript runtime built on Chrome's V8 JavaScript engine. It allows JavaScript to be run on the server side. Node.js uses asynchronous and event-driven programming, which makes it very fast. It has a large ecosystem of open source libraries and is used by many large companies. The document provides an introduction and overview of Node.js, how to install and use it, popular frameworks like Express and Connect, and emerging technologies like web sockets that Node.js supports.

1. The new, new hotness.
Eventful JavaScript on the Server
@dshaw

2. About.me/dshaw Web Application Developer
WVU 2006, 2008
WVU ACM Treasurer

3. What’s your avor? Java
Python
C / C++ / C#
Erlang / Haskell
Ruby JavaScript

4. JavaScript, really?
• Learning Javascript used to mean you weren't a
"serious software developer". Today, not learning
Javascript means the same thing.
- James Governor ( @monkchips )
• http://twitter.com/monkchips/status/25217409319

5. The Hype Hacker News <3’s Node.js
“Everyone’s talking about it.”

6. GitHub Node is the #3 most watched project
on GitHub ...and moving fast.

7. Why is Node.js so hot?

8. Node’s Fast. Non-blocking event driven architecture.

9. Your Fast! Speed from idea to prototype to
production.

10. Developer Satisfaction! Love your code.
Love coding.

11. My Favorite Reason
• JavaScript on the Client
• JavaScript on the Server
= Fun!

12. Show Me Some Code!
var http = require('http');
http.createServer(function(req, res) {
res.writeHead(200,
{'Content-Type': 'text/plain'});
res.write('Hello, Node.n');
res.end();
}).listen(1337);
console.log('Server running on :1337');

13. “Hello, Node.” demo
http://github.com/Marak/hellonode/

14. var http = require('http');
http.createServer(function(req, res) {
res.writeHead(200,
{'Content-Type': 'text/plain'});
res.write('Hello, Node.n');
res.end();
}).listen(1337);
console.log('Server running on :1337');
Essential Node.js You probably won’t spend too much time
writing request/response code.

15. var http = require('http');
http.createServer(function(req, res) {
res.writeHead(200,
{'Content-Type': 'text/plain'});
res.write('Hello, Node.n');
res.end();
}).listen(1337);
console.log('Server running on :1337');
Essential Node.js Don’t cheat yourself.
You need to spend some time though.

16. Require
var http = require('http');
http.createServer(function(req, res) {
res.writeHead(200,
{'Content-Type': 'text/plain'});
res.write('Hello, Node.n');
res.end();
}).listen(1337);
console.log('Server running on :1337');
Node’s Anatomy CommonJS Require
Server definition
Talk to yourself

17. Require
var http = require('http');
http.createServer(function(req, res) {
res.writeHead(200,
{'Content-Type': 'text/plain'});
res.write('Hello, Node.n');
res.end();
}).listen(1337); Server
console.log('Server running on :1337');
Node’s Anatomy CommonJS Require
Server definition
Talk to yourself

18. Require
var http = require('http');
http.createServer(function(req, res) {
res.writeHead(200,
{'Content-Type': 'text/plain'});
res.write('Hello, Node.n');
res.end();
}).listen(1337); Server
console.log('Server running on :1337');
This is for you.
Node’s Anatomy CommonJS Require
Server definition
Talk to yourself

19. Getting Started
• nodejs.org
• API: nodejs.org/api.html
• github.com/ry/node
• github.com/ry/node/wiki
• Google Group [1]
[1] http://groups.google.com/group/nodejs • IRC #node.js on Freenode.

20. Install from source:
$ git clone http://github.com/ry/node.git
$ cd node
$ ./configure
$ make
$ make install
Installing Node.js It’s really easy.
(If you’re on a Mac or Linux.)
Windows... not so much.

21. Use the Source
http://github.com/ry/node/

22. Package MGMT
• Use Node Package Manger
aka NPM.
• Community standardized
on NPM in July 2010 [1].
• Install:
github.com/isaacs/npm
• Discover Packages:
[1] http://dshaw.me/blSO44
npm.mape.me

23. Use NPM
http://github.com/isaacs/npm/

24. The Sound of Music Express
Connect
Websocket-Server
Socket-IO
Node-Static Soda

25. Express
• Express is a *very complete* web
framework.
• Simple, elegant routing and templating.
• expressjs.com
• github.com/visionmedia/express
• npm install express

26. Express
// npm dependency
var express = require('express');
var app = express.createServer();
app.get('/', function(req, res){
res.send('Hello World');
});
app.get('/user/:id', function(req, res){
res.send('user ' + req.params.id);
});
app.listen(3000);
• Follow TJ: github.com/visionmedia

27. Connect
• Connect provides a robust set of
middleware for building apps:
logging, static files, JSON-RPC.
• Need sessions, use Connect.
• github.com/senchalabs/connect
• npm install connect

28. Web Sockets
• Pure Web Sockets.
• Very efficient. Great API.
• Both draft75 and draft76 protocols.
• github.com/miksago/node-websocket-
server
• npm install websocket-server

29. Socket.IO
• Abstracts and extends the Web Socket
metaphor.
• Everything looks like a Web Socket.
• Supports: Flash, XHR Long Polling,
XHR Multipart Streaming (Comet)
• socket.io (yes, that’s a url.)
• npm install socket.io

30. Web Sockets Demos
http://github.com/dshaw/canisocket/
http://dshaw.no.de
http://github.com/dshaw/socketstuffer

31. Beware: API Changes A lot of Node.js code you may find on
GitHub is outdated. Node tries to help.

32. More JavaScript HTML5
Canvas
LocalStorage
Web Workers
Drag and Drop Web Sockets

33. Questions?
http://github.com/dshaw

34. The new, new hotness.
Eventful JavaScript on the Server
Thank you.
http://github.com/dshaw