Zero to Node Js mastery

 Zero to Node Js mastery

 1. How do you run JavaScript ? 

sol: we need a run time environment to run JavaScript code.

If we want to run JavaScript code outside of the browser then we need to install nodeJs run time environment.

 

 

Note: NodeJs is not a Programming language or not a framework. 

It is a runtime environment. 

 

NodeJs is a JavaScript runtime built on Chrome's V8 JavaScript engine.

 libuv: libuv is a multi-platform C library that provides support for asynchronous I/O

based on event loops.

It is primarily designed for use in NodeJs.

 

REPL: Read Evaluate Print Loop.

REPL use in terminal for instant work.

2. is JavaScript Synchronous or Asynchronous?

sol: out of the box JavaScript is Synchronous.

 

 

3. Node Js Modules:

ans: 

core module or built in modules:

http module 

fs module 

events module

path module

Why we use Modules:

i. Reuse existing code

ii. Organize your code

iii. Expose only what will be used.

4. Node Package Manager NPM:

different between Module and Package:

Module: Module is a file that contain some code which may be exported from module.

 

Package: A package is kind of like a collection of Modules.

 

 

5. NPM audit :  

Do this regularly to safe program from attacker.

find the vulnerability run: npm audit

fix the vulnerability run : npm audit fix 

 

 CORS:    Cross Origin Resource Sharing.

 

 

6. RESTFUL API: 

Restful API are those  that follows a certain style or pattern that we use when building http

API.

 REST: Representational State Transfer.