JWT Debugger
1Encoded (Token)
2Decoded
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How to Use JWT Debugger
1
1
Paste your encoded JWT into the left (or top) 'Encoded' area.
2
2
The header and payload will be decoded instantly and displayed in the JSON editors.
3
3
To verify the signature, enter your secret or public key in the signature area.
4
4
To generate a new token, edit the header/payload JSON and update the secret.
Features
Real-time Decoding
Signature Verification
Editable Payload/Header
100% Client-side
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01
What is JWT?
JSON Web Token (JWT) is an open standard that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
02
Why Use a JWT Debugger?
A JWT debugger allows you to inspect the content of a token without having to write code. It helps in debugging authentication flows by verifying if the claims (payload) are correct and if the signature matches your expectations. Our tool ensures privacy by processing everything locally.
Frequently Asked Questions
Yes. Our tool is client-side only. Your sensitive tokens and secrets never leave your browser or get sent to any server.
Currently, we support decoding for all standard algorithms. Signature verification is optimized for HMAC SHA256 (HS256).