IconVault's JWT Decoder turns a compact token string into readable JSON in one click. Paste the token and the header (algorithm, token type), the payload (claims like sub, name, iat and exp) and the raw signature appear in separate panels, so you can inspect exactly what an auth token carries - essential when debugging login flows, expired sessions or role-based access bugs.

Everything happens in your browser: the token is decoded locally and never uploaded to any server, so it's safe to paste staging or production tokens. Expiry is calculated automatically and shown as a green “expires in…” or red “expired…” badge. A built-in security panel warns about unsigned tokens (alg:none), missing or expired exp claims, and sensitive data like passwords or secrets hiding in the payload. Every visitor gets 5 free decodes - IconVault Pro ($12/year) unlocks unlimited use of every developer tool.