I kind of ended up writing my own version of Redis, just an Express server broadcasting events you send it, when I made my first full-stack project.

Good for learning :)

What features did you include, just the pub/sub or the key/value storage?

@Voxera iirc just pub/sub for events including a json payload. The subscribing nodes would use events to keep their data synchronized as far as they needed.

So you used javascript to solve scaling problem and used it as in memory db? Not very clever choice of tech

Sounds like you've implemented a middleware, not created a database. But good for you!

It is an eventbus, with memory persistence.
Nice!

Was it memory safe?

@localpost Then its just a pub/sub. Redis is first and most a key value database with some quite advanced scripting and list features.

Pub/sub is just built on top of the rest ;)

Still good for learning but actually implementing the db and list/script part is many times more complex than a simple pub/sub.