JWT Validator
Verify a JWT token's HMAC signature and check its expiry online, instantly. Free JWT validator for HS256, HS384, and HS512 signed tokens.
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About JWT Validator
Verify a JWT token's HMAC signature and check expiry — entirely in your browser. • Validates HS256, HS384, and HS512 signed tokens • Enter the secret key to verify the signature cryptographically • Shows expiry status (valid / expired) and decoded claims • Note: only HMAC (shared secret) tokens can be verified — RS256/ES256 require a public key