Security Tool
JWT Decoder
Decode JWT header and payload without verifying the signature.
Security
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Inspect the contents of a JSON Web Token (JWT) header and payload without needing a secret key. It is perfect for quickly verifying the data encoded in a token during development or troubleshooting.
FAQ
Can you decode a JWT online without verifying the signature?
Yes. This JWT decoder reads the header and payload in the browser without signature verification.
When is a JWT decoder useful?
It is useful for checking token contents during development, debugging auth flows, and inspecting claims quickly.
What parts of a JWT does this tool show?
It shows the decoded header and payload so you can inspect claims, metadata, and token structure.