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/
Comments URL: https://news.ycombinator.com/item?id=45943918
Points: 1
# Comments: 0
Source: hashcodetools.com
