Question 1

What is a JWT token?

Accepted Answer

A JWT (JSON Web Token) is a compact, URL-safe token used for securely transmitting information between parties. It consists of three parts: Header, Payload, and Signature, separated by dots.

Question 2

Is it safe to decode JWT tokens here?

Accepted Answer

Yes. All decoding happens locally in your browser. No data is sent to any server.

Question 3

How do I check if a JWT is expired?

Accepted Answer

Paste your JWT into the decoder. The tool will extract the exp (expiration) claim and show whether the token is expired, along with the exact expiration date and time.