This started as one annoying afternoon. I needed to format a messy JSON blob. Quick thing. So I searched "json formatter online", clicked the first result, and got hit with a cookie banner, two ads, and a popup asking me to subscribe before I'd even pasted anything. I closed it, tried the next one, same story. At some point I thought, you know what, I'll just build my own. How hard can a JSON formatter be. That one tool turned into 21. It's a small app called UtilityBox now ( https://www.utilitybox.shop/ ) and it has the usual suspects: calculator, QR code generator, password generator, regex tester, EMI calculator, currency converter, a split-expense thing for trips, SQL formatter, and a bunch more. No account, no ads in your face, everything runs in your browser. I'm not going to pretend it's some big engineering achievement. But building this many tiny tools back to back taught me a few things I wish I'd known on day one.…