How can I implement advanced authentication with Passport in Express.js?

How can I implement advanced authentication with Passport in Express.js?

To implement advanced authentication with Passport in Express.js, you can start by setting up Passport with strategies like JWT or OAuth. Do you have a specific strategy in mind?

I'm interested in using JWT for token-based authentication.

Great choice! First, install the necessary packages: passport, passport-jwt, and jsonwebtoken. Then, configure the JWT strategy in your Passport setup.

Can you show me a code example for the JWT strategy?

Sure! Here's a basic example:

const JwtStrategy = require('passport-jwt').Strategy;
const ExtractJwt = require('passport-jwt').ExtractJwt;

const opts = {
  jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
  secretOrKey: 'your_jwt_secret',
};

passport.use(new JwtStrategy(opts, (jwt_payload, done) => {
  User.findById(jwt_payload.id)
    .then(user => {
      if (user) {
        return done(null, user);
      }
      return done(null, false);
    })
    .catch(err => done(err, false));
}));

This sets up the JWT strategy to extract the token from the Authorization header.

What about handling user registration and login?

For user registration, create a route that hashes the password and saves the user to the database. For login, verify the user's credentials and generate a JWT if they are valid.