JWT Decoder
Decode the Base64URL header and payload of a JWT for debugging and documentation. The tool never sends the token away, but it does not verify the signature or prove that any claim is trustworthy.
Local text workbenchBrowser local
Processed output will appear here.
This tool only decodes the header and payload. It does not verify the signature, issuer, audience, or time claims.
Processed output will appear here.
Data handling notes
- Only the header and payload are decoded in the browser.
- Signature verification is intentionally not performed without a trusted key and algorithm context.
- Decoded claims may be forged; never authorize a user from this output.
Before you rely on the result
This tool is intended for fast inspection and routine preparation. It can save time, but it does not replace review when the result affects production systems, security settings, business data, or legal obligations.
- Check representative inputs instead of assuming one example covers every edge case.
- Do not paste secrets, private customer data, or credentials unless you have confirmed the page processes that data locally and the use is allowed by your organization.
- Copy the output into your own workflow only after checking formatting, timezone, encoding, or syntax assumptions.
- Developer utilities are designed for quick checks. Treat generated values and decoded payloads as inputs to a review process, not as proof that a system is secure.
FAQ
Does a readable payload mean the token is valid?No. Anyone can create a readable JWT; validity requires signature, issuer, audience, and time checks.
Is the token uploaded?No. Decoding happens locally in the browser.