Node.js is an asynchronous event-driven JavaScript runtime built on Chrome's V8 JavaScript engine. It allows JavaScript code to be run on the server. The document provides an introduction to Node.js, examples of how to write server code in JavaScript and use modules with npm, and popular apps and frameworks built with Node.js like Express. It also summarizes the current status and versioning of Node.js.

1. Node.js/Javascript
Calgary Meetup #1

2. What is Node.js?
• A Very Fast Asynchronous Event Driven Server
• Runs On Top of Google’s V8 Javascript Engine
• You Write Server Code In Javascript (Yay!)
• One Of The Fastest Growing Open Source Projects

3. Apps Running On Node.js
• Voxer • Sled.com
• Cloudkick • Pow
• Cloud9 • nodejitsu
• Loggly • Calipso
• Word2
• Bookfriend.me

4. How To Node
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello Worldn');
}).listen(1337, "127.0.0.1");
console.log('Server running at http://127.0.0.1:1337/');
Code from nodejs.org

5. How To Node...
Running The Server
% node example.js
Server running at http://127.0.0.1:1337/
Code from nodejs.org

6. So How Does it Really Work?
(Grocery Store Metaphore)

7. Did I Also Mention It’s Fast?
http://arlolra.no.de/

8. Node Has Modules
Frameworks (And Lots of Them)
Database
• express/connect
• node-mongodb-
native
• bricks
Others Testing • node-cassandra
Templating
• socket.io • expresso
• node-redis
• jade • hook.io • nodeunit
• node-mysql
• ejs • jsdom • vows
• moustache • everyauth • benchmark.js

9. {
Managing Module
"name": "My app"
, "description": "It Does Cool Stuff!"
, "version": "0.0.1"
, "author": {
Dependencies is
"name": "Eric Kryski",
"email": "<nodecalgary@gmail.com>"
}
, "private": "true"
Easy! , "homepage": "http://mydomain.com"
, "main": "./app.js"
, "engines": {"node": "~0.4"}
, "repository": {
• Use npm (node package manager)
}
"type": "git"
"url": "git@github.com/myproject/"
,
• Define your package.json file , "dependencies": {
"express": ">= 2.3.11"
"jade": ">= 0.12.2"
,
• Use npm install to grab all your
, "mongoose": ">= 1.4.0"
, "mongoose-auth": ">= 0.0.10"
modules , "everyauth": ">=0.2.17"
}
, "devDependencies": {
% npm install module_name "expresso": ">= 0.8.0"
}
}

10. Current Status
• Current Stable Version is v0.4.10 (Aug. 4th, 2011)
• Current Not-Stable Version is v0.5.3 (Aug. 4th, 2011)
• Moving to v0.6 in ~4 weeks (Stable Windows Support)
• Moving to v1.0 around end of 2011 (Speedy Windows & Unix Support)

11. Places To Get You Up And Running
• http://nodejs.org/
• http://howtonode.org/
• http://nodetuts.com/
• http://stackoverflow.com/questions/2353818/how-do-i-get-started-
with-nodejs
• http://groups.google.com/group/nodejs
• IRC #node.js on freenode
• I will be blogging at http://blog.erickryski.com