How to set up Supabase Auth in a Webflow Cloud app

Supabase Auth integration with Webflow Cloud facilitates server-validated sessions and custom JWT claims using a PostgreSQL-backed system, ideal for projects requiring direct control over authentication tables. This guide outlines the steps to wire up email/password authentication in a Webflow Cloud app, which involves creating browser and server clients, adding session middleware, building Route Handlers for sign-up, sign-in, and sign-out processes, and linking Webflow forms on the front end. Essential requirements include a Webflow Cloud project, a Supabase project, and Node.js 22.13.0 or higher. Supabase Auth operates on the free tier, and the integration uses the packages @supabase/supabase-js and @supabase/ssr for operations and cookie-based session management, ensuring seamless communication between server and client. The session middleware validates and refreshes the auth token on every request, while Route Handlers manage the lifecycle of user sessions. The guide also covers setting up email confirmation routes, protecting member content with getClaims(), and using Row-Level Security in Supabase to restrict data access.

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