JWT Decoder & Inspector

Decode JWT tokens to inspect the header, payload, and claims. Detects expiry and decodes timestamps. 100% browser-based — your token is never transmitted.

JWT Decoder

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JWT Token

What is a JWT Decoder & Inspector?

A JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and authorization in web applications. It consists of three Base64URL-encoded parts separated by dots: the header (algorithm and token type), the payload (claims about the user or session), and the signature. PureFormatter's JWT decoder decodes the header and payload and displays them as readable JSON, highlights expiry timestamps, and warns if the token has expired.

How to Use PureFormatter

  1. Paste your JWT token into the input panel.
  2. Click ⬇ Decode to inspect the token.
  3. The output shows the header, payload, and decoded timestamps.
  4. Check the status bar — it warns if the token is expired.

Frequently Asked Questions