Should I test my React app after deploying?
Yes, always. Click through the deployed app, test auth, forms, and API calls. Some issues only appear in production, like wrong env vars or unauthorized domains, and you want to catch them before users do.
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More FAQs in Common React Deployment Mistakes That Break 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.
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.
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