Decode a JSON Web Token's header and payload instantly — every standard claim (sub, iss, aud, iat, nbf, exp) labeled and explained, plus an independent expiry and not-before check so you don't have to do unix-timestamp math by hand. This tool decodes only: it never verifies the signature, since that needs the signing key, which this tool never asks for. Decoded entirely in your browser — the token text never touches a network.
Paste a JWT on the left, or load a sample, to see its header, claims, and expiry status.