berkbuyukdurak / learning-and-mastering-node.js

A Repository for Those Who Want to Master Node.js

Learning and Mastering Node.js

A Repository for Those Who Want to Master Node.js and related Frameworks

What is Node.js?

• It is a JavaScript runtime. It is not a language it is not a framework. The language is JavaScript.
• Built on the V8 JavaScript engine.
• Written in C++ language.
• Essentially allows you to run JavaScript code on the server.

Why is it a good choice for server side technology?

• It is extremely fast, highly efficient, and highly scalable.
• It is event driven, non-blocking I/O model.
  • Non-Blocking I/O model
    • Works on a single thread using non-blocking I/O calls.
    • Supports tens of thousands of concurrent connections.
    • Optimizes throughput & scalability in apps with many I/O operations.
    • All of the above makes Node.js apps fast & efficient.
• Same language on the front and back end.

HTTP Intro - Headers, Body, Status Codes

What is HTTP?

• Hyper Text Transfer Protocol
• Communication between web servers & clients
• HTTP Requests / Responses
• Includes header & body

Core Node Module

const http = require('http');

cost data = [
  {id: 1, name: 'A'},
  {id: 2, name: 'B'},
  {id: 3, name: 'C'}
];

const server = http.createServer((req, res) => {
  const { headers, url, method } = req;
  console.log(headers, url, method);
  
  res.setHeader('Content-Type', 'application/json');
  res.setHeader('X-Powered-By', 'Node.js');
  res.end(JSON.stringify({
    success: true,
    data: data
  }));
});

const PORT = 5000;

server.listen(PORT, => console.log('Server running on port $(PORT)'));

IMPORTANT HTTP STATUS CODES

• 1.xx Informational
• 2.xx Success
  • 200 Success
  • 201 Created
  • 204 No Content
• 3.xx Redirection
  • 304 Not Modified
• 4.xx Client Error
  • 400 Bad Request
  • 401 Unauthorized
  • 404 Not Found
• 5.xx Server Error
  • 500 Internal Server Error

• ALL CODES

HTTP REQUEST METHODS

REQUEST METHOD	What is it for?
GET	Retrieve Resource
POST	Submit Resource
PUT / PATCH	Update Resource
DELETE	Delete/Destroy Resource

RESTFUL API STANDARDS

REQUEST METHOD	Standard
GET /data	Get data
GET /data/1	Get data with ID of 1
POST /data	Add data
PUT /data/1	Update data with ID of 1
DELETE /data/1	Delete data with ID of 1

• ALL METHODS