JWT Expiration Checker Online

Inspect exp, nbf and iat claims against the current device time. Decoding does not verify the signature. Free jwt expiration checker online, with no installation or account.

Tool capabilities

Input: TXT
Output: TXT · JSON

How to use JWT Expiration Checker

Inspect exp, nbf and iat claims against the current device time. Decoding does not verify the signature. This jwt expiration checker works directly in your browser and is free to use without an account.

Paste or open your input in the editor.
Run the tool and inspect the output. If the input is invalid, correct the reported error and run it again.
Copy the result or download it to your device.

JWT Expiration Checker · Example

Input

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJleGFtcGxlIiwiZXhwIjoxODAwMDAwMDAwfQ.c2lnbmF0dXJl

Output

{
  "signatureVerified": false,
  "checkedAt": "2026-09-17T15:12:31.165Z",
  "expired": false,
  "secondsUntilExpiration": 10342048,
  "notYetValid": null,
  "claims": {
    "sub": "example",
    "exp": 1800000000
  }
}

Inspect exp, nbf and iat claims against the current device time. Decoding does not verify the signature.

Usage notes

Inputs and results are processed on this device. Tool content is not sent to a processing server.

JWT Expiration Checker