JWT Decoder

How to Use the JWT Decoder

1. Paste your JSON Web Token string into the Encoded JWT field.
2. The tool will automatically split the token into its Header, Payload, and Signature parts.
3. It decodes the Base64Url encoded Header and Payload and displays them as formatted JSON.
4. Check the Payload section to see standard claims like expiration time (exp), subject (sub), etc.
5. The status badge will indicate if the token is valid or expired based on the exp claim.
6. Use the "Copy" buttons to easily copy the decoded JSON to your clipboard.

Note: This tool decodes the token payload for inspection but does NOT cryptographically verify the signature, as the secret key is unknown. All decoding happens securely in your browser.