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Supabase Edge Functions: When and How to Use Them

Decouple heavy backend processes with Deno-based edge functions — cron jobs, webhooks, and AI generation.

Supabase Edge Functions run on Deno, close to your database. They are perfect for backend processes that shouldn't block your main application server.

Three use cases where edge functions shine:

  • Cron jobs: RSS feed aggregation, cache warming, report generation. Set up pg_cron to call your function every N hours. The function runs independently — if your app server is deploying, cron jobs still fire.

  • Webhooks: Stripe payment events, GitHub webhooks, third-party integrations. Edge functions have their own uptime — your app server can restart without missing webhook deliveries.

  • Heavy computation: AI text generation, image processing, batch database operations. Running these on your Next.js server blocks request threads. Edge functions scale independently.

    • Deployment is simple: npx supabase functions deploy my-function. Set secrets with npx supabase secrets set KEY=value. The function gets its own HTTPS endpoint at your-project.supabase.co/functions/v1/my-function.

    For auth, either disable JWT verification (--no-verify-jwt) and handle auth in your function code, or let Supabase's gateway verify the user's JWT automatically.