About this tool: JWT Decoder
Decode a JWT header and payload locally. Inspect claims without verifying the signature.
A JWT contains Base64URL sections. This inspector converts the first two sections to readable JSON so you can troubleshoot claims such as sub, iss or exp. Decoding does not establish authenticity: a readable token can still have a forged or missing signature.
How the calculation works
Worked example
| Input | eyJhbGciOiJub25lIn0.eyJzdWIiOiIxMjMiLCJuYW1lIjoiQXN0ZWQifQ. |
{"header":{"alg":"none"},"payload":{"sub":"123","name":"Asted"}}Questions and answers
What does this tool do?
Decode a JWT header and payload locally. Inspect claims without verifying the signature. A JWT contains Base64URL sections. This inspector converts the first two sections to readable JSON so you can troubleshoot claims such as sub, iss or exp. Decoding does not establish authenticity: a readable token can still have a forged or missing signature.
What affects precision and input format?
Text operations depend on the selected format. Check the supported characters and syntax in the description and example.
Where are the calculations performed?
The calculation runs in your browser. You can use the tool without installing software.
Asted Cloud
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