JWT Parser
JWT Parser is a free online tool for decoding JSON Web Tokens. Paste a token to instantly view its Header (algorithm and type), Payload (claims), and signature segment, with time-based claims like exp and iat converted to human-readable dates for quick debugging.
Decoding happens entirely in your browser — your token is never uploaded to any server, so tokens containing sensitive claims stay private. Free with no sign-up, it is ideal for backend developers debugging auth flows, checking token expiry, or learning the JWT structure.
How to Use
- Copy the full JWT (the three-part xxx.yyy.zzz string)
- Paste it into the input box — decoding happens automatically
- Review the Header and Payload JSON
- Check the issued-at and expiry times in the time claims section
FAQ
Is this JWT parser free?
Yes, it is completely free with no registration required and no usage limits.
Is it safe to paste my token here?
Yes. Decoding runs entirely in your browser — the token is never sent to any server. Still, avoid pasting live production tokens on shared or public machines.
Does this tool verify the JWT signature?
No. It only Base64URL-decodes the token to display the Header, Payload, and signature segment. Signature verification requires the secret or public key and should be done on your server.
Why can I read the Payload without any key?
Because a JWT's Header and Payload are merely Base64URL-encoded, not encrypted — anyone can decode them. That is exactly why passwords or other sensitive plaintext should never be stored in a JWT.