In fact, the closest thing we have to an ActivityPub *Reference Implementation* is the Express ActivityPub Server, which hasn't been updated recently and is only a *partial implementation*:
> https://github.com/dariusk/express-activitypub
I probably don't need to make the following point if you are a coder, but for the peanut gallery: Every substantial and mature protocol comes with a *Reference Implementation* as a testbed. And, by extension, this means ActivityPub is neither substantial nor mature.
[contd]