Programming Tutorials

  There is a specific, visceral panic that sets in when a Shopify app works perfectly in local development but crashes immediately upon deployment. You run  npm run dev , Cloudflare tunnels spin up, and the OAuth flow is seamless. You deploy to Vercel, Fly.io, or Heroku, click "Install" on a test store, and are greeted with a cryptic 404 or a Rails-style error message:  No route matches /admin/oauth/authorize . This error typically implies a disconnect between Shopify’s OAuth requirements and your Remix application’s routing configuration. It is rarely a bug in Remix itself, but rather a misconfiguration of the production environment variables or the wildcard authentication route. This guide provides a root cause analysis and a definitive technical fix for this issue using the latest  @shopify/shopify-app-remix  package. The Root Cause: Local Tunnels vs. Production Edge To fix this, we must understand why it breaks only in production. When you use the Shopify CL...