🔐 JWT Validator

Paste Token → Auto Decode → Verify Signature → Check Expiry → Debug with Confidence

❓ Frequently Asked Questions

Is this JWT Validator secure? Will my secret leak?

Completely secure. All processing happens in your browser — the secret key is never sent to any server.

Which signing algorithms are supported?

HS256, HS384, HS512 (HMAC), RS256/RS384/RS512 (RSA), ES256/ES384/ES512 (ECDSA), and none.

How do I verify a JWT signature?

For HMAC, enter the shared secret. For RSA/ECDSA, enter the public key in PEM format.

What if the JWT is expired?

The tool auto-checks exp and nbf fields, marks expired tokens in red.

Can I decode without verifying the signature?

Yes. Even without a key, the tool decodes Header and Payload JSON for quick inspection.

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