JWT Token Decoder & Validator Online

Decode JWT tokens to inspect header (algorithm), payload (claims), and check expiration status — all client-side.

Decoded header will appear here...
Decoded payload will appear here...

How to Use

  1. 1

    Paste JWT

    Paste the full JWT token (header.payload.signature format).

  2. 2

    View decoded parts

    Header and payload are decoded with JSON formatting and claim descriptions.

  3. 3

    Check expiration

    The tool automatically checks if the token has expired based on the exp claim.

FAQ

Is it safe to paste my JWT token here?

Yes. All JWT decoding happens entirely in your browser using JavaScript. No token data is transmitted to any server. You can verify by checking the Network tab in DevTools.

Can this tool verify JWT signatures?

This tool decodes and displays the header/payload and checks expiration claims. Full cryptographic signature verification requires the signing key and is better done server-side.

What does "audiences in JWT are not allowed" mean?

This error typically occurs when a JWT's "aud" (audience) claim does not match the expected audience configured in the verifying service. The token is valid structurally but rejected by the specific service.