Question 1

Is my JWT sent to a server?

Accepted Answer

No. Decoding a JWT is a Base64 operation that runs entirely in your browser. Your token is never transmitted.

Question 2

Does this tool verify the signature?

Accepted Answer

No. Signature verification requires your secret or public key, which you should never share with a third-party tool. This decoder shows the header and payload claims only.

Question 3

What is a JWT?

Accepted Answer

A JSON Web Token (JWT) is a compact, URL-safe token made of three Base64-encoded parts separated by dots: a header (algorithm), a payload (claims), and a signature.

Question 4

Can I see when the token expires?

Accepted Answer

Yes. If the payload contains an exp claim, the decoder shows it as a human-readable date and indicates whether the token is currently expired.

JWT 解码器

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JWT 解码器

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