expressjsHow can I implement authorization in an Express.js application?

Authorization in an Express.js application can be implemented by using the Express.js middleware Passport.js. Passport.js provides a simple way to implement authentication and authorization in an Express.js application.

Below is an example of how to use Passport.js in an Express.js application:

const passport = require('passport');
const express = require('express');
const app = express();

// Initialize Passport
app.use(passport.initialize());

// Set up a route to handle authentication
app.get('/auth/google', passport.authenticate('google', {
  scope: ['profile', 'email']
}));

// Set up a route to handle the callback
app.get('/auth/google/callback', passport.authenticate('google', {
  successRedirect: '/',
  failureRedirect: '/login'
}));

In the example code above:

1. The passport module is imported.
2. The passport.initialize() middleware is used to initialize Passport.
3. The passport.authenticate() middleware is used to authenticate the user with the Google OAuth2 service.
4. The successRedirect and failureRedirect options are used to redirect the user to the appropriate page after authentication.

For more information about using Passport.js in an Express.js application, see the Passport.js documentation.

Edit this code on GitHub