I Built a Privacy-First Developer Tools Website

As developers, we work with JSON constantly—API responses, config files, auth tokens, and logs. Over time, I found myself switching between multiple tools just to format JSON, compare responses, or decode JWTs.

So I built a small side project to simplify that.

The idea

The goal was simple:

• Run everything client-side


• Avoid uploading sensitive data


• Stay fast even with large JSON


• Keep the UI clean and predictable
  I wanted something I’d actually bookmark and use.

What the project includes

The site focuses on common JSON and API workflows:

• JSON Formatter & Validator


• JSON Diff


• JSON → TypeScript


• JSON Schema Generator


• JSONPath Tester


• JWT Decoder
  Everything runs in the browser, so data never leaves your machine.

🔗 Project: https://dtoolkits.com

Technical choices that mattered

• Client-side processing for privacy


• Web Workers to handle large JSON without blocking the UI


• Minimal UX over feature overload
  These decisions made the tools feel faster and more reliable.

Challenges along the way

• Safely handling invalid JSON


• Diffing structured data instead of plain text


• Promoting a new domain without getting flagged as spam


• Setting up SEO correctly on a fresh site
  Each challenge was a good learning experience.

What’s next

I’m continuing to refine performance, UX, and edge cases as people use the tools. The focus is on making a small set of tools that developers actually trust.

If you’re building dev tools, one lesson stood out:

Privacy and performance matter more than feature count.

Thanks for reading, and happy building 🚀