Look at claims before signatures
Open the tool → When a login flow fails, the first useful check is often the payload itself: subject, issuer, audience and expiration.
How to Inspect JWT Payloads Without Sending Tokens Away
Most JWT checks only require decoding the Base64URL parts locally. You often do not need to send a token to another service just to inspect its claims.
Common situations
Start from what you need to do
Time fields explain many auth issues
Open the tool → exp, iat and nbf are often enough to explain why a token is rejected even when the structure looks normal.
Local decoding reduces unnecessary exposure
Open the tool → If you only need to inspect the token contents, decoding in your browser avoids sharing the raw token with another external page.
Steps
A simple path to the result
Recommended tools
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FAQ
Frequently asked questions
No. Decoding only shows the contents. Signature verification is a separate step.