Node.js PackagesMarch 13, 2012

Shamoon Siddiqui@shamoons

What are packages?

• Ruby has Gems• Python has PyPI• PHP has PEAR (terrible)

• Node.js has Packages

Node Package Manager (NPM)

• Get NPM at http://npmjs.org/• Almost 8,000 packages!• Seriously... one line install

curl http://npmjs.org/install.sh | sh

Awesome Packages

• express• mongoose• async• socket.io• request

express

• Kickass Framework for Web Application Developmento Routingo Sessionso Templating

$: npm install –g express$: express mysite

routes/index.js

mongoose

• MongoDB is awesome (look at where we are!!!!)

• Interaction with MongoDB via an ODM• Keeps Code Clean

Models

Screenshots from MongooseJs.com

Mongoose Functions

FindingModel.find({name: “shamoon”}, function(err, data){

console.log(data);})

• Model.findOne()• Model.findById()

async

• Callbacks are awesomeo Except when they’re nested

Unless they’re well managed• Then nesting doesn’t become a huge issue

o But it is still difficult to read A function within a function

• …within a function

WTF??

Adapted from Ryan Roemer (@ryan_roemer)

Control Flow

Series• series• waterfall

Parallel• parallel• queue

socket.io

Server Client

Emit and Receive

• Basic model is to "emit" an event with data• Received "listens" for events• Acts on reception of event• Client or Server can be emitter or listener

request

• HTTP Requests made easy• POST• GET• JSON• XML

Instant Proxy Server!

https://github.com/mikeal/request

Questions?

Shamoon Siddiqui@shamoons