Why check environment variables before deploying?
Because secrets and config should never be in code. All secrets and environment-specific config should be in environment variables, with production variables set in the hosting dashboard. Committing secrets is a security risk.
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More FAQs in A Final Polishing Checklist Before Deploying a React App
Loading and error states on every fetch, responsive behavior on mobile and desktop, form validation, authentication, SEO basics, performance and bundle size, accessibility, and that environment variables are set and not in code.
Because many users will visit on mobile. Test on real devices or accurate emulators, not just browser resizing, which can hide real responsive issues. An app that only works on desktop loses a large share of users.
A meaningful title and meta description, Open Graph tags for sharing, and for public content, ensure it can be crawled. For client-side rendering, consider server rendering or pre-rendering for SEO-critical pages.
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