Security · stable

JWT Decoder

Inspect JWT headers, payloads, and time claims without verification.

Your data never leaves your browser.

Encoded token

Decoding a token does not verify its signature or authenticity. Do not use this result as proof that a token is trusted.

Header

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "demo-user",
  "iat": 1784246400,
  "exp": 1784332800
}

Signature · not verified

demo-signature

Time claims

Issued: 2026-07-17T00:00:00.000Z
Expires: 2026-07-18T00:00:00.000Z
Not before: Not present

Expired

How to use it

Clear input. Immediate result.

Enter your input, adjust the available options, and review the result. Processing happens entirely in this browser tab.

Useful for

Inspect data during development
Prepare a value for documentation
Check an input before using it elsewhere

Privacy & limits

Processing happens in this tab. Input is not sent to this site, saved to an account, or included in analytics. Sensible size guards keep ordinary input responsive.

FAQ

Does this upload my input?

No. The implementation runs locally in the browser.

Should I use sensitive production data?

Prefer sanitized values. Local processing reduces exposure, but your browser, extensions, and device remain part of your security boundary.

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