What is JWT Decoder?

JWT Decoder lets you paste any JSON Web Token and instantly see its decoded header, payload, and signature. Useful for debugging authentication flows, verifying token claims, and inspecting expiration times without any external tools.

How to use

1. Paste your JWT token into the input field — the three Base64-encoded sections will be automatically detected.
2. View the decoded header (algorithm, type) and payload (claims, expiration, issuer) displayed in a readable format.
3. Copy individual decoded sections or the full parsed output to use in your debugging workflow.

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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