Process & Environment Variables

Summary

The global `process` object exposes info about the running Node instance (args, env vars, exit codes) — `process.env` is the standard way to configure an app without hardcoding secrets.

How to Learn This

1Read a config value from `process.env` and provide a sensible default.
2Use a `.env` file with a library like `dotenv` for local development.
3Learn `process.exit()` codes and graceful shutdown handling (`SIGTERM`, `SIGINT`).

File System (fs)

Event Emitter

More topics in Node.js Fundamentals

Node.js Runtime V8 Engine Event Loop Non-Blocking I/O Modules (CommonJS vs ESM)NPM & Package Management package.json Async Programming Callbacks Promises Async/Await Streams Buffers File System (fs)Event Emitter Child Processes Clustering

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