iat — Issued At

Location: payload · Format: timestamp

Unix epoch seconds when the token was created. Useful for rejecting implausibly old or future-dated tokens and, in OIDC flows, for bounding how long a client should keep an outstanding nonce waiting for a matching ID token.

Defined in RFC 7519 §4.1.6.

Decode a JWT and inspect its iat claim in the TokenPrism debugger — free, entirely in your browser.