JWT Decoder
Decode JSON Web Tokens
Encoding & Security
ENCODED TOKEN
DECODED CONTENT
Privacy First
All decoding happens in your browser. No data sent to servers.
Instant Inspection
View header, payload, and signature instantly
Timestamp Parsing
Automatically converts timestamps to readable dates
What is JWT?
JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs are digitally signed and can be verified and trusted.
JWT Structure:
- • Header: Algorithm & token type
- • Payload: Claims (user data)
- • Signature: Verification hash
Common Claims:
- iss - Issuer
- sub - Subject
- aud - Audience
- exp - Expiration Time
- iat - Issued At
Detailed Guide & Usage
A JWT decoder parses JSON Web Tokens and displays the header, payload, and signature as formatted JSON. JWTs are used for authentication in OAuth, SSO, and API security. Quickly inspect claims, expiration, and roles without a backend.
How to Use:
- Paste an active JSON Web Token (JWT).
- The tool will separate the header, payload, and signature into distinct JSON blocks.
- Hover to review timestamp translations (e.g., expiry date).