Decode, verify, and inspect JSON Web Tokens (JWT) headers and claims without exposing sensitive keys.
Local Browser Execution • Zero Server Logs
Encoded JWT Token
HEADER: Algorithm & Token Type
// Header JSON will appear here
PAYLOAD: Data Claims
// Payload JSON will appear here
SIGNATURE
// Signature hash string
Frequently Asked Questions
A JWT is an open standard (RFC 7519) for securely transmitting information between parties as a compact, URL-safe JSON object. It consists of three parts separated by dots: Header, Payload (claims), and Signature.