JWT Decoder
Header / Payload / Signature with expiry check
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Decodes only — does not verify signature.
Quick guide
What can JWT Decoder help you do?
Free JWT decoder. Shows header, payload, signature, and expiry status. Browser-only — your token stays private.
Best for
JWT Decoder helps with quick debugging, API data cleanup, format checks, and small code or config tasks without opening an IDE or installing a package.
How to use it
For JWT Decoder, paste the text, code, or configuration into the input area, choose the mode you need, and run it. For large data, test a small sample first.
How to read the result
After using JWT Decoder, the output is kept copy-friendly for docs, code, and config files. When validation is available, fix the reported error location before trusting the final output.
Privacy and limits
When using JWT Decoder, most processing happens in the browser. Do not paste passwords, private keys, tokens, or unmasked production data into any online tool.
For JWT Decoder: Developer tools are for quick inspection and conversion. They do not replace tests, linting, security review, or version control.
Frequently Asked Questions
What is a JWT?
JSON Web Token — three Base64-encoded parts used for API auth and sessions.
Does this verify signatures?
No — verification requires the secret key from your server.