JWT Decoder

Decode JSON Web Tokens Online

The JWT Decoder decodes JSON Web Tokens and displays the header, payload, and signature in a readable format. It also shows the token expiry status so you can quickly check whether a token is still valid.

What Is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe token used for authentication and information exchange. It consists of three Base64URL-encoded parts separated by dots: the header (algorithm and token type), the payload (claims), and the signature.

Features

• Decode JWT header, payload and signature instantly
• Check token expiry (exp claim) at a glance
• View issued-at (iat) and not-before (nbf) timestamps
• No token is sent to any server — fully client-side