Paste a JWT and read its header and payload side by side, with the registered claims labeled and exp/nbf/iat shown as local date-times with expiry badges. For HS256/384/512 a secret field verifies the signature locally via WebCrypto.
Privacy ledger
Data acquired
None.
Libraries used
Lit 3 — bundled into the tool file itself.
Data stored
None.
Data transmitted
None.
Use it on your own page
Download the tool as a single self-contained HTML file: readable source with the Lit library included, zero network requests — it works opened straight from your disk, and you can customize everything.