Decode and inspect JSON Web Tokens — header, payload, claims, and expiration. Runs entirely in your browser, nothing is sent to a server.
A JSON Web Token (JWT) has three Base64URL-encoded parts separated by dots: a header (algorithm & type), a payload (claims), and a signature (used to verify integrity).
All decoding happens locally in your browser — your token is never sent to a server, which makes this safe to use even with production tokens.