Sometimes your application needs an API endpoint that isn't provided by the standard database APIs.
An Edge Function can provide that custom layer.
Define the Endpoint
Start by deciding what the API should do. For example: /create-report The endpoint might accept parameters and generate a report.
Validate the Request
Check that required fields exist and contain valid values. Never trust data simply because it came from your own frontend.
Perform the Operation
The function can communicate with Supabase or an external service. For example, it could:
Query the database Call another API Process data Generate a response
Return JSON
Your frontend can consume a structured JSON response. Include useful status information when something fails.
Protect the Endpoint
If the API should only be available to authenticated users, verify the user's authentication state.
Keep Secrets Server-Side
If the endpoint needs a private API key, store it as a server-side secret. The browser should never receive that private credential.
This approach gives your application a clean API layer without requiring a separate backend server for every small operation.