# JWT decoder

> Decode a JSON Web Token's header and payload locally. Expiry and issued-at claims show as readable dates, and nothing leaves your browser.

Canonical: https://www.joelcsaji.com/tools/jwt-decoder

Category: Developer. Interactive: open the canonical URL in a browser to use it. It runs entirely client-side.

## What it does

- Splits the token into header, payload, and signature.
- Shows exp, iat, and nbf as local dates with an expired or valid badge.
- Checks HS256, HS384, and HS512 signatures if you paste the secret; other algorithms are decoded only.

Back to all tools: https://www.joelcsaji.com/tools