JWT Decoder

Free online JWT decoder. Decode JWT tokens into header, payload, and signature with expiration status. All client-side.

How It Works

1

Paste your JWT

Paste the full JWT token (the three base64-encoded parts separated by dots).

2

Read the decoded sections

The header (blue), payload (purple), and signature (green) are displayed with formatted JSON.

3

Check expiration

Timestamps are converted to readable dates. Expiration status shows whether the token is still valid.

FAQ

No. Signature verification requires the secret key or public key, which this tool intentionally does not ask for. It only decodes.
Yes. Everything runs in your browser. The token is never sent to any server.
Standard claims: iss (Issuer), sub (Subject), aud (Audience), exp (Expiration), iat (Issued At), nbf (Not Before), jti (JWT ID).

Built & Maintained by Varstatt

Varstatt is a one-person product studio run by Jurij Tokarski, product engineer since 2011. These tools are free and open — no signup, no catch.