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JWT Claims Validator

Decode a compact JWT, apply claim-policy checks, and optionally verify an HS256 signature entirely in your browser.

Token and policy

Compact JWT / JWSExactly three unpadded Base64url segments, up to 64 KiB.

Evaluation time (UTC)Leave blank to use the current time.

Allowed clock skew (seconds)

Issuer (iss)

Subject (sub)

Audience (aud)Matches a string or one item in an array.

Required claimsComma-separated JSON member names.

Shared secret (UTF-8 text)

Only use a key you are authorized to handle. It stays in this page and is never saved or sent. An empty field skips verification.

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