JWT Decoder
Paste a JSON Web Token (JWT) to decode and inspect its header and payload contents.
What is a JWT?
A JSON Web Token is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three parts:
- Header: Algorithm and token type.
- Payload: Data claims (user ID, expiration, roles).
- Signature: Verification string.
How to Use
- Paste the full JWT string (starting with
ey...). - The tool automatically decodes the Header and Payload sections.
- Review the expiration (exp) and other claims.
You might also like
Frequently Asked Questions
No, this tool does not verify the signature because that would require your private key or secret. It simply decodes the base64url payload so you can read the data.
Yes. The decoding happens entirely in your browser. Your token and data are never sent to any server.