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Add a sample or test JWT.
Code & Data Tool
JWT Validator
Validate JWT structure and decode header and payload without signature verification.
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About this tool
What is JWT Validator?
JWT Validator checks the structure of a JSON Web Token and decodes its header and payload. It does not verify the signature, so it cannot tell you the token is genuine.
Useful when you need to
- Check whether a token is well-formed
- Read the claims in a sample token
- Learn how JWTs are structured
How to use
How to use JWT Validator
01 02 Validate
Run the check.
03 Read the decoded parts
Look at the header and payload.
04 Review expiry
Check any time claims.
Tips
Get better results
- Do not paste production tokens, even though decoding happens in your browser.
- A decoded token is not proof it is trustworthy. Signature verification needs the secret or key.
FAQ
Frequently asked questions
Does it verify the signature?
No.
Is the token sent anywhere?
No, it is decoded locally. Still, avoid real tokens.
What are the three parts?
Header, payload and signature, separated by dots.
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