Question 1

How do I decode a JWT token?

Accepted Answer

Paste your JWT (JSON Web Token) into the input field and the tool will instantly decode and display the header, payload, and signature. No server-side processing — everything runs in your browser.

Question 2

Is it safe to paste my JWT here?

Accepted Answer

Yes. The JWT decoder runs entirely in your browser. Your token is never sent to any server. However, avoid sharing JWTs publicly as they may contain sensitive claims.

Question 3

What information is in a JWT token?

Accepted Answer

A JWT contains three parts: the Header (algorithm and token type), the Payload (claims like user ID, expiration time, and roles), and the Signature (verification hash). Our tool decodes and displays all three parts.

Question 4

Can I verify a JWT signature with this tool?

Accepted Answer

The tool decodes and displays the signature but does not verify it, as verification requires the secret key or public key used to sign the token.

JWT Decoder

Verify Signature (HS256 only)