JWT Decoder
Paste any JWT and instantly decode its header and payload. Automatically converts Unix timestamps to readable dates. No data is sent to any server.
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Frequently Asked Questions
- What is a JWT?
- A JWT (JSON Web Token) is a compact way to send claims between parties, often used for authentication. It has a header, payload, and signature. This JWT decoder shows the decoded header and payload and converts timestamps to dates.
- Is my JWT sent to a server?
- No. Decoding happens entirely in your browser. Your token is never uploaded or stored — paste and inspect safely.
- What can I see when I decode a JWT?
- You see the header (algorithm, type) and payload (claims like sub, exp, iat). Unix timestamps are shown as readable dates. Invalid or tampered tokens are reported.