What do you check before shipping React to production?
Production build succeeds, bundle size is reasonable, env vars are set, error boundaries wrap the app, loading and error states are everywhere, auth works in production, and the app is responsive and accessible.
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More FAQs in Production Readiness Interview Questions for React Developers
Run npm run build, deploy the build folder to a host like Vercel, Netlify, or Firebase Hosting, set environment variables in the dashboard, and configure SPA routing so deep links work.
Set them in the hosting dashboard, not in code. Remember that frontend env vars are visible to users in the browser, so real secrets go in a backend, not in React code.
Because the host serves 404 for routes that are not files. Fix by redirecting all routes to index.html, so React Router loads and handles the route client-side.
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