How to add user authentication for Webflow site visitors (Webflow Cloud)

Webflow Cloud can host a Next.js members-area application alongside a public Webflow site by mounting it at a path such as `/members`, allowing marketing teams to continue publishing public pages independently. The approach uses a small, manually managed JSON account list stored in secret environment variables, PBKDF2-hashed passwords, an HMAC-signed stateless session cookie, and Edge middleware that redirects unauthenticated visitors to a login page. Because Webflow Cloud runs on Cloudflare Workers, the implementation relies on Web Crypto APIs and a custom constant-time comparison function that works consistently both locally and in deployment. The setup requires Next.js 15.2.3 through 15.x, npm, correctly configured mount-path variables, and avoidance of unsupported Edge runtime declarations in Route Handlers. Login and logout handlers create and clear scoped, HttpOnly cookies, while client-side requests must explicitly include the deployment base path. The guidance highlights security limitations, including a 100,000-iteration Workers cap for PBKDF2, the need for rate limiting, small account-list capacity, and the fact that account changes require redeployment, recommending an identity provider such as Auth0 or Supabase Auth for larger-scale needs such as self-service registration, password resets, and social login.

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