JWT Decoder
Decode JWT header and payload (display only — no signature verification)
About JWT Decoder
The JWT Decoder parses a JSON Web Token into readable header and payload JSON so you can inspect algorithm, claims, expiry, and custom fields. Backend and frontend developers use it while debugging auth flows—note that it displays claims only and does not verify signatures.
- Never paste production secrets or long-lived tokens into public tools if your policy forbids it.
- Check exp and nbf claims when debugging unexpected 401 responses.
- A valid decode does not mean the token is trusted—signature verification happens on your server.