I've created another npm package that is complimentary to holster-router, this one is called holster-browser. It's another extraction of core utilities and components from RSStream so I can use them in other projects.

So now if you want to use Holster with Express and React, it's super easy to put them all together and have a working authentication system. Holster is still completely independent, but the other two side projects assume the same endpoints and account structures. I'll probably add to both as I need extra features and not worry so much about publishing the applications that use them.