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Multi-FA-Auth — A beginner-friendly Node/Express + Vanilla JS authentication demo that implements a complete sign-up/sign-in lifecycle: email verification (4‑digit OTP), optional 2FA (email OTP, TOTP authenticator, backup codes), password reset, account settings, session handling, and deploy-ready email fallback (Brevo → SMTP → debug).

  • Updated Feb 13, 2026
  • JavaScript

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