Show HN: DataStays, developer data tools that run in the browser (datastays.dev)

I got tired of spammy data formatting tools, so I built my own. There's no backend, uploads, ads, analytics. Everything runs locally in the browser and works offline after first load. You can verify this using DevTools → Network tab.

I put in everything I could think of: formatter, validator, JWT decoder, Base64, hash, CSV/Excel/YAML/TOML converters, protobuf decoder, and a whole bunch more.

Feedback welcome on what's missing or what's broken.