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Cookie / JWT Auditor

Web Security

Audit cookie flags and JWT settings for weaknesses — right in your browser.

What is Cookie / JWT Auditor?

Cookie / JWT Auditor inspects the security posture of cookies and JSON Web Tokens you paste in. It flags missing protective cookie attributes and risky JWT choices like weak algorithms or absent expiry.

Because it is fully client-side, the tokens you analyze never leave your browser — safe for sensitive session data.

What it flags

  • Cookie flags — missing Secure, HttpOnly and SameSite attributes.
  • JWT algorithm — alg=none and weak/symmetric algorithm risks.
  • JWT claims — missing or excessive expiry, audience and issuer.
  • Decoding — readable header and payload for quick inspection.
  • Local-only — nothing is uploaded; analysis runs in your browser.

Where it fits in your workflow

  • →Quickly assess session-cookie hardening during a web test.
  • →Inspect a captured JWT for obvious misconfigurations before deeper attacks.
Use Cookie / JWT Auditor

Free, in-browser — no sign-up needed to try.

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At a glance

CategoryWeb Security
RunsIn your browser
Token cost Free — no tokens
AccessFree · no login to try
Status● Live

Frequently asked questions

Can it crack a JWT secret?

This client-side auditor flags weak settings. For offline HS256 secret cracking, the Vulnerability Scanner includes a wordlist-based check in its server-side engine.

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