The answer
Production build succeeds, bundle size is reasonable, environment variables are set, error boundaries wrap the app, loading and error states are everywhere, auth works in production, and the app is responsive and accessible.
Deployment and Production React Interview Questions
What should you check before shipping a React app to production?
More FAQs in Deployment and Production React Interview Questions
Run npm run build to create the production bundle, then deploy to a host like Vercel, Netlify, or Firebase Hosting. Set environment variables in the dashboard, and configure SPA routing so deep links work.
Dev builds keep readable code, source maps, and hot reload. Production builds minify code, remove development warnings, and optimize for size and speed. Users load less and faster with a production build.
Set them in the hosting platform's dashboard, not in committed code. Remember that frontend env vars are visible to users in the browser, so real secrets go in a backend, not in React code.
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