What are some examples of using Passport.js for authentication?

What are some examples of using Passport.js for authentication?

Passport.js is a popular middleware for Node.js that simplifies authentication. Here are a few examples: 1. Local strategy for username and password authentication. 2. OAuth strategy for social logins like Google or Facebook. 3. JWT strategy for token-based authentication.

Can you show me a code snippet for the local strategy?

Sure! Here's a basic example:

const passport = require('passport');
const LocalStrategy = require('passport-local').Strategy;

passport.use(new LocalStrategy(
  function(username, password, done) {
    // Replace with your user authentication logic
    User.findOne({ username: username }, function (err, user) {
      if (err) { return done(err); }
      if (!user) { return done(null, false); }
      if (!user.verifyPassword(password)) { return done(null, false); }
      return done(null, user);
    });
  }
));

This sets up a local strategy for username and password authentication.

What about using OAuth with Passport.js?

For OAuth, you can use strategies like passport-google-oauth20. Here's a quick example:

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

passport.use(new GoogleStrategy({
    clientID: GOOGLE_CLIENT_ID,
    clientSecret: GOOGLE_CLIENT_SECRET,
    callbackURL: '/auth/google/callback'
  }, function(accessToken, refreshToken, profile, done) {
    // Logic to find or create a user in your database
    return done(null, profile);
  }
));

This allows users to log in using their Google account.