JWT Decoder

What is JWT?

JSON Web Tokens (JWT) are an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and information exchange in web development.

How to Use This Tool

1. Paste your JWT token in the textarea above.
2. The token will be automatically decoded into three parts: Header, Payload, and Signature.
3. Use the tabs to switch between viewing each part of the token.
4. For tokens with timestamp fields (exp, iat, nbf), human-readable date information will be displayed.
5. For tokens with an expiration time, the validity status and remaining time will be shown.
6. Use the copy button to copy any part of the decoded token.

Common JWT Fields

• iss (Issuer): Who issued the token
• sub (Subject): Who the token refers to
• aud (Audience): Who the token is intended for
• exp (Expiration Time): When the token expires
• nbf (Not Before): When the token starts being valid
• iat (Issued At): When the token was issued
• jti (JWT ID): Unique identifier for the token

Security Note

This tool decodes JWT tokens client-side in your browser. No tokens are sent to any server. However, be cautious about pasting sensitive tokens in any online tool.