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Phase 18 · Deployment

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Environment Variables

Part of the Frontend Developer Roadmap.

Summary

Configuration values (API keys, base URLs, secrets) kept outside your codebase and injected at build/runtime — critical for keeping secrets out of version control.

How to Learn This

  • 1Move a hardcoded API URL into an environment variable in a project.
  • 2Learn the difference between build-time and runtime environment variables in Next.js.
  • 3Never commit a `.env` file containing real secrets to version control.

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