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JWT Debugger & WebCrypto Signature Verifier
Zero-network HMAC-SHA256 token verification, claims parser & exp countdown
WebCrypto Subtle API
Encoded Token
Load Sample JWT
Paste JWT (Header.Payload.Signature)
HMAC Secret Key (for HS256 signature verification)
Verify
Signature: Unverified
Decoded Token Inspection
Header (Algorithm & Token Type)
{}
Payload (Data & Registered Claims)
{}
Claim Lifespan Check
Issued At (iat):
-
Expires At (exp):
-
Lifespan Status:
-