How do I use Passport.js with OAuth?

Can you explain how to use Passport.js with OAuth for user authentication?

Sure! Passport.js is a middleware for Node.js that simplifies authentication. To use it with OAuth, you'll need to install the necessary Passport strategies, like passport-google-oauth or passport-facebook. Have you already set up your Node.js application?

Yes, I have a basic Node.js app running. What are the next steps?

Great! First, install the Passport and the specific OAuth strategy you need. Then, configure Passport in your app by initializing it and setting up session handling. Would you like a code example?

Yes, please provide a code example for Google OAuth.

Here's a simple example: After installing passport and passport-google-oauth, you can set it up like this:

const passport = require('passport');
const GoogleStrategy = require('passport-google-oauth20').Strategy;

passport.use(new GoogleStrategy({
  clientID: 'YOUR_CLIENT_ID',
  clientSecret: 'YOUR_CLIENT_SECRET',
  callbackURL: '/auth/google/callback'
}, (accessToken, refreshToken, profile, done) => {
  // User authentication logic here
}));

Make sure to replace YOUR_CLIENT_ID and YOUR_CLIENT_SECRET with your actual credentials.