Debug Supabase Edge Function deployment and runtime errors

Supabase Edge Functions run on Deno, not Node.js. Common failures include importing Node.js modules, incorrect CORS headers, and deployment issues. The Deno runtime has different module resolution and APIs.

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Error messages you might see

Edge Function returned a non-2xx status code
TypeError: Deno.env.get is not a function

Why this happens in AI-generated code

1

Using Node.js modules in Deno runtime

AI-generated code imports Node.js packages via npm: syntax or uses Node built-ins like 'fs' that aren't available in Supabase Edge Functions' Deno runtime.

2

Missing CORS headers

AI tools generate Edge Function handlers without CORS headers, causing browsers to block responses from the function when called from your frontend.

3

Environment variables not configured

AI-generated functions reference environment variables that aren't set in the Supabase project secrets, causing runtime errors when accessing Deno.env.get().

How to fix it

1

Use Deno-compatible imports and APIs

Use esm.sh or deno.land/x for third-party modules. Replace Node.js built-ins with Deno equivalents (e.g., Deno.env.get() instead of process.env).

2

Add proper CORS headers

Handle OPTIONS preflight requests and add Access-Control-Allow-Origin, Access-Control-Allow-Headers, and Access-Control-Allow-Methods headers to all responses.

3

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Related technologies

SupabaseTypeScript

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Frequently asked questions

Can I use npm packages in Supabase Edge Functions?

Some npm packages work via esm.sh CDN imports (import pkg from 'https://esm.sh/package-name'). However, packages that depend on Node.js built-ins will not work in the Deno runtime.

How do I set environment variables for Edge Functions?

Use the Supabase CLI: `supabase secrets set MY_KEY=my_value`. In the dashboard, go to Edge Functions > Secrets. Access them with Deno.env.get('MY_KEY') in your function.

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