It's a dependency-free JavaScript library that does one thing: masks inputs. No npm bloat, no build step, no tests (yet). Just a script tag and some mask attributes:

```html <input mask="(00) 00000-0000"> <input mask="00/00/0000"> <input mask="AAA-0000"> ```

Where `0` = digit, `A` = letter, and everything else = "let's see what happens".

I made this as a weekend boredom project because existing solutions required reading documentation, and I'm fundamentally opposed to that. It works with vanilla JS, plays nicely with htmx (shockingly), and has caused zero production incidents so far (sample size: 1).

The code is probably terrible, the edge cases are definitely unhandled, but unformatted input is ugly and this library is… slightly less ugly.

GitHub: https://github.com/DaviTostes/htmask

Fair warning: Use at your own risk. Or better yet, don't use it at all. But if you do, let me know what breaks.