JSONViewerTool

I work with APIs and JSON daily, and I kept running into the same issues with existing JSON tools:

• Cluttered UIs

• Forced signups

• Server-side uploads for sensitive data

• Slow performance for large JSON

So I built JSONViewerTool as a simple, fast, browser-based alternative.

What it does:

• JSON viewer (tree + raw)

• JSON validation & formatting

• JSON → CSV / Excel / YAML

• CSV → JSON

• JWT decoding

• Base64 tools

Everything runs fully client-side — no data ever leaves your browser.

This started as a personal utility, but I’m now opening it up for feedback from other developers.

Would love thoughts on:

• Missing features

• UX improvements

• Performance on large payloads

🔗 https://jsonviewertool.com