JWT Expiration Visualizer

JWTs contain expiration claims (exp, iat, nbf) as Unix timestamps. Reading raw numbers like 1730908800 is not intuitive. A JWT Expiration Visualizer decodes these values into human-readable dates and shows a timeline of the token's lifetime — from issued to now to expires — so you can quickly see if a token is valid, expiring soon, or already expired.

This is especially useful when debugging authentication issues, testing token refresh flows, or inspecting tokens from third-party services. The visual progress bar makes it obvious how much of the token's lifetime has elapsed.

The exp (expiration) claim is the most critical — it tells when the token should no longer be accepted. The iat (issued at) claim records when the token was created. The nbf (not before) claim, when present, indicates when the token becomes valid; tokens are rejected before this time.

All three use Unix timestamps (seconds since January 1, 1970 UTC). This tool converts them to local dates and times, and highlights them in the decoded payload so you can quickly spot expiration-related fields.

Short-lived access tokens (e.g., 15–60 minutes) reduce the window of abuse if a token is stolen. Long-lived refresh tokens can be used to obtain new access tokens without re-authenticating. The visual timeline helps you understand how much time remains and plan refresh logic accordingly.

When the tool shows green, the token is valid. Yellow means less than 1 hour remains — consider refreshing soon. Red means the token is expired and should not be used for authenticated requests.