How do I add authentication to a React app before deployment?
Choose an auth approach like Firebase Auth, set up an AuthContext, build login and signup pages, protect routes, configure your deployed domain as an authorized domain, test the full flow, and handle token refresh and errors.
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More FAQs in How to Add Authentication to a React App Before Deployment
Firebase Auth for simplicity and speed, Auth0 for enterprise features, or a custom backend with JWTs for full control. Firebase is the fastest for a frontend-focused project and works well with React.
Because auth providers like Firebase only allow redirects from authorized domains. If you skip adding your deployed domain to the list, auth redirects will fail in production even though they work on localhost.
Signup, signin, signout, protected route access, and persistence across page reloads. A bug in auth in production is much worse than in development, so test the full flow thoroughly before going live.
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