I've been doing the same for a couple of months now, and I love it. Can access it from various devices through the browser and it syncs well.

Big thumbs up from me so far.

The hardest part was setting up a CouchDB instance for the backend, but I found some instructions and fiddled with it until it worked.

Link: https://noteself.github.io/

how do you secure it, is it a long obfuscated URL?

My setup requires a username and password to be entered, which I think is the intended authentication method, since it uses a database at the backend.