JWT authentication

 JWT authentication: JWT (JSON Web Token) is a popular way to authenticate users in web applications. It allows you to securely transmit data between the client and server without the need for cookies or sessions. Here's an example of how to implement JWT authentication in a Node.js application:

javascript

const jwt = require('jsonwebtoken');

const user = {

  id: 1,

  username: 'johndoe',

};

const token = jwt.sign(user, 'secretkey');

console.log(token);

const decoded = jwt.verify(token, 'secretkey');

console.log(decoded);