JWT Validator
NewValidate a JWT token by checking its structure, verifying the HMAC-SHA256 signature with a provided secret, and checking standard claims like exp (expiry), iat (issued at), and nbf (not before). Identifies common JWT issues like expired tokens, invalid signatures, missing required claims, and malformed structure. Essential for debugging JWT authentication issues in web applications.
JWT Validator
Verify a JWT signature using HMAC-SHA-256. Checks signature validity and expiration status.
How to Use JWT Validator
- 1Paste your JWT token
- 2Optionally enter the signing secret to verify signature
- 3View decoded header and payload
- 4Check validation status and any errors
Your Privacy is Protected
JWT Validator runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
Can I verify a JWT without the secret?
You can decode and inspect the payload without the secret, but you cannot verify the signature. Signature verification requires the same secret used to sign the token.
Why Use This Tool?
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