Node.js Fundamentals

Understand Node.js module selection, convert require and module.exports to import and export, replace CommonJS globals, and test interoperability before migrating a production package.

Use asynchronous APIs without blocking the event loop, understand microtask and timer ordering, run independent work concurrently, and propagate failures with async/await.

Copy a large file with bounded memory by composing Node.js streams, resolve paths safely, handle backpressure automatically, and clean up partial output on failure.

Build a dependency-free JSON HTTP service with routing, body limits, correct status codes, health checks, request timeouts, and graceful shutdown.

Create a reproducible npm project, define lifecycle scripts, load configuration with the built-in environment-file support, and distinguish runtime settings from secrets.

Install the official Node.js 24 LTS binary on a 64-bit Ubuntu server, verify its published checksum, and keep application dependencies reproducible with npm lockfiles.