Essential
JWT Studio
Decode an existing token, edit its claims, choose an HMAC algorithm and secret, then re-sign it in one workspace.
Decode → edit → re-sign
JWT token
Editable header
Editable payload
Signing
Verification ready
Decode a token, or edit the JSON and sign a new one.
Subject
user_123
Issuer
—
Expiry
No exp
HMAC signing is for HS256/384/512 tokens. Do not paste production secrets on shared devices.