JWT Decoder

Yes. Unlike many other tools, the FluxToolkit JWT Decoder is 100% client-side. Your token is never sent to our servers and is processed entirely within your browser's memory.

No. Verifying a signature requires your private secret or public key. To protect your security, we do not ask for secrets and therefore do not verify signatures. This tool is for inspecting the token's header and payload data.

Our tool automatically looks for the 'exp' claim in the payload and converts the Unix timestamp into a human-readable date. It will also provide a visual indicator if the current time is past the expiration date.

A JWT (JSON Web Token) is the overall standard. A JWS (JSON Web Signature) is a JWT that has been digitally signed to ensure its integrity. Most tokens you encounter in OAuth2 are JWS tokens.

The tool will attempt to decode each part. If the token is not correctly formatted (e.g., missing parts or invalid Base64Url encoding), it will display a clear error message.

Our tool decodes standard three-part JWTs. If your payload contains another encoded token as a claim, you can copy that value and paste it into the decoder for a second level of inspection.

Yes! OIDC uses JWTs for its ID Tokens. You can use this tool to inspect claims like 'nonce', 'at_hash', and 'c_hash'.

If the decoded payload is not valid JSON, it may be because the token is encrypted (JWE) rather than just signed (JWS). This tool decodes signed tokens but does not decrypt JWE tokens.

Yes, the FluxToolkit JWT Decoder is 100% free and designed for secure, professional debugging.

The tool follows the RFC 7519 specification. If your token follows the standard three-part dot-separated format, it will decode correctly.