Complete Error Handling Patterns for Supabase Edge Functions — 4-Stage Fallback Design

Complete Error Handling Patterns for Supabase Edge Functions Why Error Handling Matters Edge Functions have three error sources: external APIs, database access, and user input. Without proper handling: Flutter clients crash on unexpected 500s Supabase logs fill up with noise Debugging takes forever The 4-Stage Fallback Template Deno . serve ( async ( req : Request ) => { // Stage 1: CORS preflight if ( req . method === ' OPTIONS ' ) { return new Response ( null , { headers : corsHeaders , status