Paste a JSON Web Token to decode its header, payload, and check expiration.
Algorithm:
Signature verification requires the secret/key and is not performed client-side for security.
Decode JSON Web Tokens instantly in your browser. View the header algorithm, payload claims, expiration status, and token structure with color-coded visualization.
A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting claims between parties. It consists of three Base64URL-encoded parts: header, payload, and signature.
Yes. All decoding happens entirely in your browser. Your token is never sent to any server.
This tool decodes and inspects tokens but does not verify signatures, as that requires the signing secret or public key.
