JWT Decoder / Inspector
Decodes and inspects JSON Web Tokens — header, payload claims, and signature. Runs entirely in your browser — tokens are never transmitted.
Encoded Token
● Header
● Payload
● Signature
Header
Validity
Payload Claims
| Claim | Value |
|---|
Signature
Signature verification requires the secret key (HMAC) or public key (RSA/ECDSA). This tool decodes the token structure only.