This document provides an introduction to Node.js. It discusses why JavaScript can be strange, but explains that JavaScript is relevant as the language of the web. It then discusses what Node.js is and its event-driven, non-blocking architecture. Popular Node.js applications like HTTP servers, REST APIs, and web sockets are mentioned. Examples are provided of building a simple web app with Express and Jade, a REST API with Restify, and using web sockets with Socket.io. The document also discusses using Mongoose with MongoDB for data modeling.

1. Introduction Node.js
ERIK VAN APPELDOORN | MARCH 28TH 2014 | SDN EVENT

2. About me
 Erik van Appeldoorn Trainer | Consultant
 Avans Hogeschool, Academie Industrie & Informatica
 Twitter: @evappeld
 Blog: codeagainstthecode.tumblr.com
 Mail: erixio@xs4all.nl

3. Subjects

4. JavaScript WHY?
 Unstructured
 Not intuitive
 Unlogical
 Prototypical Inheritance… WTF?
 Dynamically typed
 No Intellisense/code completion
 Hard to debug
 Global variables

5. JavaScript is strange (I)
console.log(1 == true); //true
console.log(1 === true); //false
console.log("0" == false); //true
console.log("abc" == "a" + "b" + "c"); //true
console.log(null == undefined); //true
console.log(30 -"7"); //23
console.log("30" + 7); // 307

6. JavaScript is strange (II)
function rectangle(x,y) {
this.x = x;
this.y = y;
}
rectangle.prototype.area = function() {
return this.x * this.y;
}
var twoByThree = new rectangle(2,3);
console.log(twoByThree.area());

7. But…JavaScript is relevant
 THE language of the WEB
 Cross-platform
 Huge REACH
 JavaScript is everywhere (client, server, libs, frameworks)
 Single Page Applications
 Server applications
 End-to-End JavaScript applications

8. Learn JavaScript!

9. JavaScript the good parts
http://www.youtube.com/watch?v=hQVTIJBZook
Dough Crockford

10. Learning JavaScript
 http://www.codecademy.com/tracks/javascript
 http://www.w3schools.com/js/default.asp
 http://eloquentjavascript.net/
 Learn Node.js

11. What is Node.js?
 Open Source, Cross platform Development platform
 Uses V8 JavaScript engine (Google)
 “JavaScript on the server”
 Node.js is a command line tool

12. Node.js history
 Developed in 2009
 Published in 2011 (Linux only)
 Ryan Dahl, Joyent
 From July 2011 Windows version available
 Active community: check http://nodeconf.com/

13. Node.js architecture
 Node.js is event-driven with Non-blocking I/O
 Uses a Event loop for Non-blocking I/O
 Node.js is single threaded

14. Node.js Event loop

15. Node.js applications
“Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network
applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and
efficient, perfect for data-intensive real-time applications that run across distributed devices.”
 HTTP server
 REST server
 Web Sockets
 TCP server
 Utillities
Building Scalable Network programs

16. Hello Node.js World!

17. Hello Node.js World!
+ http server

18. http://nodejs.org/download/

19. Text editor
 JetBrains WebStorm
 Sublime Text
 Visual Studio + Node.js tools for Visual Studio
 Nodeclipse
 Cloud9

20. Node Package Manager (NPM)
 www.npmjs.org
 60.000+ modules
 package.json file (npm init)
 npm install <module.name> --save
 DEMO

21. Polular NPM modules
express mocha
restify jade
socket.io redis
underscore mongoose
moment request
async connect
grunt passport

22. Local modules
 DEMO

23. Node.js Website with express + jade

24. Node.js Website with express + jade
 Express: http://expressjs.com/
 Connect: http://www.senchalabs.org/connect/
 Jade: http://jade-lang.com/
 DEMO Connect

25. Features express: Routing

26. Features express: Views
 DEMO Express + Jade

27. Node.js REST API with Restify

28. Restify
 Maps HTTP verbs to CRUD operation
 Handles URL & Body params
 RESTIFY: http://mcavage.me/node-restify/

29. Restify
 DEMO Restify

30. WebSockets

31. Node.js WebSockets with Socket.io

32. Socket.io
 Bi-directional communication
 WebSockets + fallbacks
 SOCKET.IO: http://socket.io/

33. Socket.io
 DEMO Socket.io
Server
Client

34. Node.js with Mongoose & MongoDB

35. MongoDB
 NoSQL document store
 JSON collections
 MongoDB: http://www.mongodb.org/
 Robomongo: http://robomongo.org/

36. Mongoose
 Object modelling for MongoDB
 Define schemas in Node.js for MongoDB
 Query building (ODM)
 Mongoose: http://mongoosejs.com/

37. Mongoose
 DEMO Mongoose & MongoDB

38. The MEAN stack
http://www.mean.io

39. QUESTIONS?