jwt.mirio.dev

JSON Web Token debugger — decode, verify, re-sign.

Local-first. Decoding, verification, and signing all run in your browser via WebCrypto. Your token and secret never leave this page.

Encoded

HeaderJSON

PayloadJSON

Verify signature

Paste a JWT to begin

Supported: HS256, HS384, HS512 (HMAC). RS*, ES*, PS*, and EdDSA can decode but are not verified or re-signed yet.