Fixes by platform
Pick the product in the error message. Each page lists only the fixes that mention it.
Where apps usually break
SupabaseLogin sends people to localhost, empty lists, refused saves, and API keys. 17 fixes.StripeWebhooks that fail the signature check, never arrive, or use a test price in live mode. 3 fixes.Vercel404s on refresh, missing env vars, timeouts, 500s, and domain setup. 23 fixes.LovableWhat usually breaks after you publish a Lovable app or point a domain at it. 30 fixes.BoltDeploy problems that show up once a Bolt project leaves the preview. 28 fixes.CursorProduction errors in apps written with Cursor, from env vars to server crashes. 30 fixes.ReplitA published Replit app that will not load, including the 0.0.0.0 listen address. 1 fix.NetlifyPage not found on refresh, env vars, and redirect rules. 11 fixes.
Also mentioned
v0Fixes that come up in v0 apps, mostly after they are hosted. 17 fixes.Next.jsNext.js errors that survive the deploy: hydration, env vars, and server routes. 13 fixes.ViteVite build and env-var issues that appear on the host, not on your laptop. 6 fixes.ReactBrowser-app routing problems after a React project is published. 3 fixes.CORSThe browser blocking a request to another site after you go live. 2 fixes.DomainsCustom domains that stay pending or show an invalid configuration. 2 fixes.OpenAIOpenAI 429s when the AI feature works in testing and fails for real users. 2 fixes.PrismaConnection errors when Prisma talks to Supabase from serverless functions. 2 fixes.SecurityKeys that must never ship in the browser, and how to rotate them. 2 fixes.AI APIsAI provider errors that show up once the app has real traffic. 1 fix.ClerkSign-in loops and redirect settings after a Clerk app is deployed. 1 fix.GoogleGoogle sign-in rejected because the callback URL does not match. 1 fix.