JWT Expiration Checker

JWT Expiration Checker tool

🔒 Runs in your browser · No uploads · Your data never leaves your device

How to use

1. 1

   Paste your JWT

   Paste a JWT token (starting with eyJ) in the input field.

2. 2

   Check the status

   The tool shows VALID, EXPIRED, NOT YET VALID, or NO EXPIRY CLAIM based on the current time.

3. 3

   Read the claims

   See exp, iat, and nbf as Unix timestamps and human-readable UTC dates.

Common use cases

• Debugging expired token errors — Quickly check if a JWT has expired when an API returns 401 Unauthorized, without writing any code.
• Pre-flight token validation — Verify a token is still valid before making an API call in a script or Postman collection.

Examples

• Expired token

  A token with a past exp claim.

  Output

  EXPIRED — expired 1825 days ago

Frequently asked questions

Is the JWT sent to a server?

No. Decoding and expiry checks run entirely in your browser.

What if there is no exp claim?

The tool shows NO EXPIRY CLAIM — the token has no expiration set.

Key concepts

exp

JWT expiration claim — a Unix timestamp indicating when the token becomes invalid.

nbf

Not Before claim — a Unix timestamp before which the token should not be accepted.

iat

Issued At claim — the Unix timestamp when the token was created.

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