Parse JWT headers, payloads, and key information online. No installation required—just paste and decode.
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Still parsing JWTs manually? This tool automatically splits Base64Url encoded JWT strings, deconstructing them into three parts: Header, Payload, and Signature. JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting JSON data, carrying authentication and claim information through a dot-separated three-part structure. The tool decodes the JSON content of the header and payload, visually displaying core fields such as the encryption algorithm, issuer, and expiration date.
Does it verify signature validity?
No. This tool only decodes the header and payload content. Signature verification must be performed on the server side.
Why do some standard fields (like iss/exp) show up as empty?
JWT payload claims are optional. If the original token does not contain the corresponding field, it will appear empty. For example, if the exp field is missing, the expiration date will show as not set.
Please ensure you input the complete JWT string (three-part structure) and avoid including line breaks. The parsed results may contain sensitive identity information, so please do not use this tool on public devices. Unverified JWTs should not be used directly for authentication in production environments.
During development and debugging, pay special attention to the exp (expiration timestamp) and nbf (not before) fields in the payload. Typical example: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyLCJleHAiOjE2NTAwMDAwMDB9.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c. After parsing, you can see the algorithm is HS256 and it is valid until the year 2130.
