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/
fainpul•17m ago
https://github.com/gchq/CyberChef
rsunnythota•1m ago
CyberChef is built for cybersecurity analysts who need complex data transformation pipelines (e.g., decode → decrypt → extract → analyze). It's incredibly powerful for that.
HashCodeTools is built for web developers who just need quick, simple tools without the complexity:
Need to format JSON from an API response? → One click Generate a UUID for testing? → Instant Decode a JWT token? → Paste and done Think of it as "CyberChef for everyday developers" - simpler, faster, and optimized for common dev workflows rather than security analysis.
Both tools are great for different audiences!