Why add error boundaries before deploying React?
Because an unhandled error in production shows a blank screen, which is a terrible experience. Error boundaries wrap the app so an error shows a fallback instead, letting users recover or report the issue.
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More FAQs in A Deployment Checklist for Shipping a React Project
Production build succeeds, environment variables are set, SPA routing is configured, auth domains are authorized, error boundaries wrap the app, loading and error states are everywhere, and the app is responsive and accessible. Then test the deployed app.
Because some issues only appear in production, like wrong environment variables, unauthorized auth domains, or broken deep links. Testing the deployed app catches these before users do, which is the whole point of a checklist.
Because the host serves 404 for routes that are not files, since routing is client-side. Configuring the host to redirect all routes to index.html means React Router handles them and deep links work.
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