I was looking into improving my sing-up and login workflows and I looked into Okta course.
At the moment we are using passport with our custom database and customs strategies and sessions remote storage. It seems like Okta can be used on its own. I did find some custom libraries online to use it with Passport.js. I don't see why you would tough.

Anyone has any experience with Okta and any opinion on why you would use it with passport ?