JWT expiry check

Nearby workflows on Toolcore

• JWT decode — Inspect JWT header and payload as JSON in browser; signature not verified. before you trust a token, digest, or key material in production.
• JWT sign & verify — Sign HS256/384/512 JWTs or verify HMAC signatures in the browser—pair with JWT decode for claims. before you trust a token, digest, or key material in production.
• JWT verify (RSA / ECDSA) — Verify RS256/384/512 or ES256/384/512 JWTs with a PEM public key in the browser—Web Crypto only. before you trust a token, digest, or key material in production.
• Unix timestamp converter — Epoch to date: seconds, milliseconds, ISO-8601, UTC and local time—in browser. before you trust a token, digest, or key material in production.

Common use cases

• Quickly see if a staging token is expired before debugging API 401s.
• Check nbf (not before) when clocks skew between issuer and client.
• Read iat alongside exp when reviewing token lifetime policy.

Common mistakes to avoid

• Treating this as signature verification

  This only reads time claims—it does not validate trust or integrity.

• Ignoring clock skew

  Comparison uses your device clock; large skew can mislead nbf/exp checks.

FAQ