How do I implement OAuth2 strategy using Passport.js?

How do I implement OAuth2 strategy using Passport.js?

To implement OAuth2 with Passport.js, you need to install the passport and passport-oauth2 packages. Would you like a code example?

Yes, please provide a code example.

Here's a basic example:

const passport = require('passport');
const OAuth2Strategy = require('passport-oauth2');

passport.use(new OAuth2Strategy({
  authorizationURL: 'https://provider.com/oauth2/authorize',
  tokenURL: 'https://provider.com/oauth2/token',
  clientID: 'your-client-id',
  clientSecret: 'your-client-secret',
  callbackURL: 'https://yourapp.com/auth/provider/callback'
}, function(accessToken, refreshToken, profile, done) {
  // User authentication logic here
}));

This sets up the OAuth2 strategy. Do you need help with the authentication flow?

Yes, what does the authentication flow look like?

The flow typically involves redirecting the user to the provider's authorization page, then handling the callback to retrieve the access token. Would you like more details on that?