🔐 RFC 7519 JSON Web Token Inspector
JWT Debugger & Token Decoder
Decode, inspect, and validate JSON Web Tokens (JWT) client-side with claim timestamp parsing and zero server logging.
🔒 100% Client-Side Private
Encoded JWT String (Header.Payload.Signature):
HEADER: Algorithm & Token Type
HS256
PAYLOAD: Data Claims
Active
Parsed Key Claims:
Paste a valid JWT to view human-readable expiration and subject claims.
RFC 7519 JSON Web Token Architecture
A JSON Web Token (JWT) is composed of three Base64URL-encoded segments separated by periods (.):
- Header: Identifies token type (
JWT) and cryptographic hashing algorithm (HS256,RS256). - Payload: Contains public claims including Subject (
sub), Issuer (iss), Issued At (iat), and Expiration Timestamp (exp). - Signature: Ensures message integrity verified with a cryptographic secret or public key.