JWT Decoder Online — Free & Private

A free edge API by formatho.com, privacy-first developer tools.

Open the full browser tool →

Free, no signup, runs entirely in your browser — your data never leaves your device.

🔓 Free🔒 Zero tracking🚫 No data collection⚡ Edge-fast

Usage

curl "https://jwt-decoder-formatho.filesformatho.workers.dev/api?token=eyJhbGciOi..."

Returns the decoded header, payload, and a claims summary (exp / iat / nbf as human dates). Signature is not verified — decoding happens without the secret, so treat outputs as untrusted.

Full parameter reference: /api endpoint.

Privacy-first: tokens are decoded in-memory on Cloudflare's edge and never logged. For secrets, use the client-side tool where nothing leaves your browser.

Full browser tool

Decode and debug JWTs entirely client-side: JWT Debugger on formatho.com.

All Formatho edge APIs

Browse every free Formatho Worker tool on the Formatho Tools index.