How can I implement authentication in my Node.js app using Passport.js?

How can I implement authentication in my Node.js app using Passport.js?

To implement authentication with Passport.js, first install it using npm. You can use the command: npm install passport passport-local.

What are the steps to set up a local strategy?

You need to configure the local strategy by requiring passport-local and defining a strategy with a verify function that checks user credentials.

Can you show me an example of the verify function?

Sure! Here's a simple example:

passport.use(new LocalStrategy(
  function(username, password, done) {
    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);
    });
  }
));

What about session management?

For session management, you can use express-session along with Passport.js to maintain user sessions across requests.