17+ browser-based dev tools: JSON/XML/YAML/SQL formatters, regex tester, JWT decoder, hash generator and more. Everything runs client-side — nothing you paste is uploaded or logged. No signup, no rate limits on the core tools.

Hey Product Hunt 👋 I built Formalint after years of working in ERP and SQL environments, getting tired of pasting sensitive data into random "free json formatter" sites with a dozen ad networks and no clear privacy policy. Formalint is a browser-based dev toolbox: JSON, XML, YAML, and SQL formatters, a regex tester, JWT decoder, hash generator, cron parser, UUID generator, color converter, and a few encoders/converters. Everything runs client-side — nothing you paste is uploaded or logged. No account, no rate limits, no premium wall on the core tools. It's a solo project and still actively growing — a couple more converters shipping soon, plus an API for the same tools. Would love feedback on: 1. Which tool you'd reach for first 2. Any formatter/converter you wish existed that isn't here yet Thanks for checking it out!

Love that everything stays client-side, makes it feel safe to paste real tokens. One thing I'd love is a diff view for two JSON snippets side by side, would save me a ton of context switching when comparing API responses.

Formalint

Browser-based dev tools, no backend, no signup

Browser-based dev tools, no backend, no signup