This is a mini project about basic NodeJs.

• OS: Ubuntu 18
• Install NodeJs on Linux $ sudo apt-get install nodejs(1)
  To check version of Nodejs: $ node -v
  When you run command (1) that is also install npm.
  To check version of npm: $ npm -v

Module is a file .js and inside this file have to define a code module.exports = [nameA]
When another .js file want to use that file have to define a code nameA = require('that file').

To using any module built in NodeJS:
var fsy = require('fs')
with: fsy : in your option, fs: this is a NodeJS's module.

You can read others module at: here.

To install:

1. Installing nmp (done when you installed nodejs)
2. Initialize npm for your project: $: npm init
3. By tap enter for all default.
4. After input info your project, in your project will be add a package.json file.
5. Installing which module third party you want with: $ npm install [name modele] --save , (--save means that module will be stored your project)

• Converting Object to String:
  JSON.stringify(nameObject)

• Converting String to Object:
  JSON.parse(nameString)

• Synchronous: Assume that, you have 2 tasks A and B. If you use Sync, you will only done task A and then you make task B.
• Asynchronous: Similar you also have 2 above task. But during task A going on, you can make task B without wait task A done.

• This is concept that show a hard code, more loop, terrible reading....

• If inside a function use multip promise function, I have to put async in front of that function.