What is JWT Decoder?
Paste any JSON Web Token to see its decoded header, payload, and signature. Check token claims, verify expiration times, and debug authentication issues in seconds.
How to use
- Paste your JWT token into the input field — the three Base64-encoded sections will be automatically detected.
- View the decoded header (algorithm, type) and payload (claims, expiration, issuer) side by side.
- Copy individual decoded sections or the full parsed output.
Result
You're debugging a 401 error in your API. Paste the bearer token from the request header to check if the 'exp' claim has already passed or if the 'aud' claim matches your expected audience.
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