Thank you, I really appreciate your feedback and decision!

In files such as sso_rest.js var is used a lot and the quality in general seems a bit lower than other parts of the codebase

The entire concept of SSO was adopted from this project, and some file was untouched, like sso_rest.js (four files if I remember correctly). It looks like a POC and some files could be written much better of course. I just wanted to focus on "bigger picture" of this update. But indeed, it's necessary to refactor those files. I will do it myself or maybe open an issue on Github and let to do it by one of the Utopian users? :)

I am aware of varied code quality. Engrave codebase is a one-man-job. I personally wrote every single line of code (except for some files like CSS for themes or those third-party solutions mentioned above) and gained a lot of experience doing that. There are still a lot of places that need to be refactored but I think I'm going in the right direction. Development is now much easier than previously. And I feel better as a backend than frontend developer as you can tell from both code quality and some imperfections of appearance. And I'm focused on missing features. There will be time to fine tune everything else :)

If that's the case, then in my opinion you should mention this somewhere in the code at least, and maybe even in the post itself.

I'm going to post more detailed technical articles as part of "Engineering" category of blog.engrave.website and there this information will be provided with all other details.

P.S. it says Jason instead of JSON, haha.

Wait, what? Where? There's nothing like that, and never was ;)