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Phase 9 · Connecting Frontend & Backend

Topics

Environment Variables & API URLs

Part of the Full Stack Developer Roadmap.

Summary

Configuring your frontend to call the right backend URL across local, staging and production — without hardcoding `localhost` into something that ships to real users.

How to Learn This

  • 1Use an environment variable for your API base URL instead of hardcoding it.
  • 2Set different values for local development vs your deployed production API.
  • 3Learn which env vars are safe to expose to the frontend bundle and which must stay backend-only.

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React Query / TanStack Query

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Loading & Error States

More topics in Connecting Frontend & Backend

CORSAPI Integration with Fetch/AxiosReact Query / TanStack QueryLoading & Error StatesOptimistic UIFull-Stack Data FlowFile Uploads End-to-End
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