Comment by heresjohnny

The IndexedDB API [1] is fairly easy to work with. I personally use idb [2] as a wrapper, but that's optional. The hardest part is getting it neatly integrated with whatever you're using to manage state. I use a centralized Redux-like store to push events to, which then get automatically persisted to Indexed DB. Hope this helps!

[1] https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_A...

[2] https://github.com/jakearchibald/idb