How do I handle errors in Passport.js?

How do I handle errors in Passport.js?

In Passport.js, you can handle errors by using middleware to catch authentication errors. You can define a custom callback to manage these errors.

Can you show me an example of error handling in a Passport.js strategy?

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, { message: 'Incorrect username.' }); }
      if (!user.verifyPassword(password)) { return done(null, false, { message: 'Incorrect password.' }); }
      return done(null, user);
    });
  }
));

What should I do if I want to log these errors?

You can log errors by adding a logging mechanism inside your error handling callback. For example, you can use console.error(err) to log the error details.

Is there a way to customize the error messages returned?

Yes, you can customize error messages by modifying the message parameter in the done function. Just pass your custom message as needed.