Why do my React routes return 404 in production?
Because the host serves a 404 for routes that are not real files, since routing is client-side. Configure the host to redirect all routes to index.html, so React Router handles them. Vercel and Netlify usually do this automatically.
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More FAQs in Common React Deployment Mistakes That Break Production
Usually because you forgot to set production environment variables in the hosting dashboard, so the app uses fallback or localhost values. Set environment variables for each environment before deploying.
Because Firebase only allows redirects from authorized domains. Forgetting to add your deployed domain to the authorized list means auth redirects fail. Add your domain in the Firebase console before deploying.
Lazy-load heavy routes with React.lazy and Suspense so the initial bundle only contains what the first page needs. Run a bundle analyzer to find large dependencies, and consider replacing or removing heavy libraries.
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