Supabase Edge Functions Advanced — Deno, Webhooks, Scheduled Jobs, and Multi-tenant Patterns

Supabase Edge Functions run on Deno Deploy — a lightweight serverless runtime that's not Node.js. This article goes beyond basic CRUD to cover webhook signature verification, scheduled jobs via pg_cron , and secure multi-tenant data isolation.

Understanding the Deno Environment

The biggest gotcha for developers coming from Node.js is that Edge Functions use Deno , not Node. Key differences:

No require() — use ES module import syntax only.

Node built-ins like fs and crypto are available with the node: prefix (partially).

npm packages are importable directly with the npm: prefix (Deno 1.34+).

No persistent filesystem writes — use /tmp for ephemeral data only.

// Importing npm packages directly in Deno import { Resend } from " npm:resend@3 " ; import Stripe from " npm:stripe@14 " ;

Enter fullscreen mode

Exit fullscreen mode

For local development, run supabase functions serve --env-file .env.local to get a…