Decode and inspect JSON Web Tokens. Everything runs in your browser — no data is sent anywhere.
Header (JOSE)
Paste a JWT above to decode
Payload (Claims)
—
Signature
—
About JWTs: A JSON Web Token (JWT) consists of three Base64url-encoded parts separated by dots: a header specifying the algorithm and token type, a payload containing claims (like user ID, expiration, issuer), and a cryptographic signature. This tool decodes the header and payload client-side — it does not verify the signature, as that requires the signing key.