Install and use Node.js, npm, Socket.IO, React, Express

In this article, we will briefly describe the installation of Node.js , npm (Package Manager Node.js), Socket.IO , React and Express . Below we will show you the basic usage of Node.js for beginners.

Installation

Installation Node.js
apt install nodejs

Installation npm
apt install npm

Installation Socket.IO
npm install socket.io

Installation React
npm install react

Installation Express
npm install express

Example of using Node.js

For example, create an app.js node.js script:
vim app.js

var http = require('http');
http.createServer(function (request, response) {
response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('Hello World!');
}).listen(5000);
console.log('We up at http://localhost:5000');

And we'll run it:
nodejs app.js
Now when we open http://localhost:5000 in the browser, we see "Hello World!".

Autostart node.js apps

By installing the screen package (for linux) and the nodemon module, we can automatically restart the node.js applications:
apt install screen
npm install nodemon

Finally, we roll the node.js application in the new screen using nodemon:
screen
nodemon app.js
Put the shortcut ctrl+a+d to make the app.js node.js run in the background ...