Sometimes, we want to fix the ‘Error: failed to serialize user into session’ error with Passport.js.

In this article, we’ll look at how to fix the ‘Error: failed to serialize user into session’ error with Passport.js.

How to fix the ‘Error: failed to serialize user into session’ error with Passport.js?

To fix the ‘Error: failed to serialize user into session’ error with Passport.js, we use the serializeUser and deserializeUser methods.

For instance, we write

passport.serializeUser((user, done) => {
  done(null, user);
});

passport.deserializeUser((user, done) => {
  done(null, user);
});

to call serializeUser with a callback to serialize the user data.

The callback is run when the operation is done.

We call deserializeUser with a callback to serialize the user data.

The callback is run when the operation is done.

We call done to indicate the operation is done

Conclusion

To fix the ‘Error: failed to serialize user into session’ error with Passport.js, we use the serializeUser and deserializeUser methods.