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Phase 5 · Backend with Node.js & Express

Topics

Environment Variables

Part of the Full Stack Developer Roadmap.

Summary

Configuration values (database URLs, API keys, secrets) kept outside your codebase and injected via `process.env` — critical for keeping secrets out of version control on both frontend and backend.

How to Learn This

  • 1Use a `.env` file with `dotenv` for local backend configuration.
  • 2Add `.env` to `.gitignore` before your first commit.
  • 3Learn the difference between backend secrets (never exposed) and frontend env vars (bundled into public code).

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More topics in Backend with Node.js & Express

Node.js Runtime & Event LoopNPM & Package ManagementExpress Basics & RoutingMiddlewareREST API DesignRequest ValidationError Handling
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