Table Of Content

Introducing NodeJs

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1- What is NodeJs?

Before directly answering the question " What is NodeJS?", I am going to introduce you about the birth context of the  NodeJS, which helps you understand the matter more easily.

Chrome & V8 Javascript Engine

Everyone knows that  Chrome is a famous and free Google browser with the first version released in December 2008, of which  V8 JavaScript Engine is a program written on  C++, open source code, used in the  Google Chrome to parse and execute  Javascript code with high performance. It parses  Javascript syntax and interprets it into computer code for execution.
Note: The browsers other than the  Chrome may use other  Javascript Engine.
Browser Javascript Engine
Chrome V8 JS Engine
Firefox SpiderMonkey
IE, Edge Chakra

NodeJS

You can use   "the  syntax of Javascript" to write code snippets to connect to a database. The  V8 JS Engine will parse your  Javascript code and interprets it into computer code for execution. Of course, such code snippet is not for execution at the client side. it is used at the server side. Thus, an ability is opened, you can use " the  Javascript syntax" to write server-side web applications instead of using PHP or Java.
** Javascript code **
const mysql = require('mysql');
const connection = mysql.createConnection({
  host: 'localhost',
  user: 'user',
  password: 'password',
  database: 'database name'
});
connection.connect((err) => {
  if (err) throw err;
  console.log('Connected!');
});
and  NodeJS was born. The  V8 Javascript Engine is one of components of the  NodeJS. Below is the architecture image of the  NodeJS:
In short, the NodeJS may replace  PHP, Java to build Server-side web applications. Instead of writing code by PHP, Java you use the syntax of  Javascript.

So, What is NodeJS?

The NodeJS is  JavaScript Runtime Environment outside browser. The  NodeJS also consists of other components and libraries so that it may operate like a  Web Application Server.
Important note: The  NodeJS is not the extended language of  Javascript.

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