Learning Node and Express

What is Nodejs?

• Environment to run JS outside Browser
• Built on Chrome's V8 JS engine
• Big Community
• Full Stack

Browser vs Nodejs

Browser	Nodejs
DOM Manipulation	No DOM Manipulation
Window	No Window
Interactive Apps	Server Side Apps
No Filesystem	Filesystem
Fragmentation	Versions
ES6 Modules	CommonJS Modules

Built-in Modules

1. OS
2. PATH
3. FS
4. HTTP

NPM - Node Package Manager

• NPM
• npm i <packageName>
• npm i -g <packageName>
• npm i <packageName> -D
• npm i <packageName> --save-dev
• npm i <packageName> --save

Resource

1. The Basics of Package.json in Node.js and npm

Event Loop

1. The Node.js Event Loop, Timers, and process.nextTick()

2. NodeJS Event Loop

3. What the heck is the event loop anyway? | Philip Roberts | JSConf EU

4. Everything You Need to Know About Node.js Event Loop - Bert Belder, IBM

Course Slides

Course Slides

Events

• Event-Driven Programming
• Used heavily in Node.js

Streams

• Writeable
• Readable
• Duplex
• Transform

How Web Works

HTTP Request/ Response Cycle

HTTP Messages -> Request <-> Data <-> Response -> Node/Express

HTTP Methods

• GET - Read Data
• POST - Insert Data
• PUT - Update Data
• DELETE - Delete Data

Resources

• HTTP Status Codes
• MimeTypes
• Third Party Middleware - Morgan