Question 1

How do I decode a JWT token?

Accepted Answer

Paste the full JWT string (header.payload.signature) into the input field. The tool instantly decodes and displays the header, payload with all claims, and indicates whether the token has expired.

Question 2

Is it safe to decode JWT tokens online?

Accepted Answer

Yes, when using our tool. The decoding happens entirely in your browser — the JWT is never sent to any server. However, never share JWTs containing sensitive data in tools that transmit data to servers.

Question 3

What information does a JWT contain?

Accepted Answer

A JWT has three parts: the header (algorithm and token type), the payload (claims like user ID, email, roles, and expiration time), and the signature (used to verify authenticity). Our decoder displays the header and payload in readable format.

JWT Decoder