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aidd-jwt-security

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JWT security review patterns. Use when reviewing or implementing authentication code, token handling, session management, or when JWT is mentioned.

ai/skills/aidd-jwt-security/SKILL.md

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# JWT Security Review

**AVOID JWT if you can.** Prefer opaque tokens with server-side sessions.

Patterns {
  ## Session State
  any(refresh token rotation, refresh reuse detection, jti denylist, jti revocation,
      token bound to session, token bound to device, logout invalidates token server-side)
    => Critical: Prefer opaque tokens with server-side sessions. You're tracking state anyway.

  ## Storage & Transport
  (token in localStorage or sessionStorage) => Critical: XSS vulnerable. Use httpOnly Secure SameSite=Strict cookies.
  (token in URL or query params) => Critical: Leaks via logs, Referer, browser history, analytics.
  (token logged or sent to analytics) => Critical: Scrub tokens from all logging pipelines.