Convert tools

JWT Claims Checker

Check exp, nbf, iat, issuer and audience against an explicit reference time and leeway.

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Does not verify the signature. Times must be safe integer Unix seconds. Expiration is required for the overall check to pass; missing optional time claims are reported.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

How to use

  1. Check exp, nbf, iat, issuer and audience against an explicit reference time and leeway.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

exp=1767229200, now=1767225600 → expiration check passes

Details and limitations

Does not verify the signature. Times must be safe integer Unix seconds. Expiration is required for the overall check to pass; missing optional time claims are reported.

Text stays in your browser; it is not sent to a conversion server.

FAQ

JWT Claims Checker — What are the supported inputs and limits?

Does not verify the signature. Times must be safe integer Unix seconds. Expiration is required for the overall check to pass; missing optional time claims are reported.

Format references

Tool page updated: