Show HN: HashCodeTools – 17 Free Privacy-Focused Dev Tools

Hi HN! I built HashCodeTools, a collection of 17 free, fast, privacy-focused developer utilities that run entirely in the browser — no data ever leaves your device. As a backend engineer, I constantly found myself Googling things like “json formatter”, “jwt decoder”, “uuid generator”, “base64 encode”, etc. I realized I was using 6–7 different sites, many of which were slow, ad-heavy, or sent data to servers. So I decided to build one clean, unified toolbox. What it currently includes JSON Formatter / Validator JWT Decoder Base64 Encoder / Decoder UUID Generator URL Encoder / Decoder Epoch ↔ Date Converter HTML / CSS / JS Formatters YAML ⇄ JSON Converter CSV ⇄ JSON Converter QR Code Generator Text diff viewer …and more. Privacy Features 100% client-side No tracking No logins No ads No backend — everything runs in your browser This means you can safely paste production JSON, JWTs, or logs without worrying about them being uploaded anywhere. Why I built this I wanted: One tab for all dev utilities Zero network requests Instant formatting/decoding Tools that don't break with large payloads A simple interface without popups or ads Tech Stack TypeScript Next.js Monaco Editor TailwindCSS Local-only processing (no API calls) Roadmap VSCode extension Chrome extension More text & data format tools Open-source versions of each utility Dark mode improvements Feedback welcome! I'm especially looking for feedback on: Performance on large JSON/JWT payloads Missing tools developers want UI/UX improvements Any privacy/security concerns Thanks for checking it out! Link: https://hashcodetools.com/ https://hashcodetools.com/