How to use Supabase as a database backend for a Webflow site your team still edits visually

Webflow Cloud can use Supabase as a backend for visitor-generated data while Webflow CMS remains responsible for published site content, by deploying a Next.js App Router application at a mounted path on the site’s domain and exposing server-side route handlers that access Supabase. The process requires a Webflow site with Cloud enabled, a Supabase project, Next.js 15 or later, Node.js 22 or later, and npm, with custom-domain mounting and page custom code subject to plan requirements. It begins by creating a Supabase table with Row Level Security enabled and no public policies, then scaffolding an npm-based Next.js project, configuring a Webflow Cloud mount path, and adding a server-only Supabase client that uses protected environment variables and a service-role or future secret key. A GET and POST route handler can retrieve and insert validated records, while a Webflow page script calls the mounted route on the same origin and safely renders visitor input with textContent. Because the sample POST endpoint is unauthenticated and lacks rate limits or quotas, production use should add authorization, rate limiting, and spending controls. Common deployment problems include unsupported Next.js edge runtime exports, omitted mount-path prefixes, missing or incorrect cloud environment variables, and use of pnpm or Yarn instead of Webflow Cloud’s supported npm workflow.

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