JWT Verify

Verify and decode JSON Web Tokens (JWT) to validate signatures and extract payload information.

How It Works

1

Input JWT Token

Paste the JWT token you want to verify and decode. The token should be in the standard three-part format.

2

Provide Verification Key

Enter the secret key (for HMAC) or public key (for RSA) used to verify the token's signature.

3

Verify and Decode

The tool validates the signature, checks expiration, and displays the decoded header and payload information.

Frequently Asked Questions

What does JWT verification check?

JWT verification checks the cryptographic signature to ensure the token hasn't been tampered with, validates the expiration time, and decodes the payload to show the claims.

Why is my JWT verification failing?

Common reasons include: wrong secret/public key, expired token, modified token content, or algorithm mismatch. Check that you're using the correct key and algorithm.

Can I decode a JWT without verifying it?

Yes, the tool can decode the header and payload even without verification keys, but this won't validate the signature or ensure the token's authenticity.

Is it safe to verify JWTs in the browser?

Yes, all verification happens locally. However, be cautious with secret keys - only use this tool with test tokens or in secure environments.

What information is in a JWT payload?

JWT payloads typically contain claims like user ID (sub), expiration time (exp), issued time (iat), issuer (iss), and any custom claims specific to your application.

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