JWT Decoder
Decode and inspect JSON Web Token header and payload instantly.
FAQ
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe way to represent claims between two parties. It consists of three base64url-encoded parts: header, payload, and signature.
Does this verify the JWT signature?
No. This tool only decodes the header and payload. Signature verification requires the secret key, which you should never share.
Is my JWT sent to a server?
No. Decoding happens entirely in your browser. Nothing is transmitted anywhere.