Async Programming

Summary

The general practice of writing code that doesn't block while waiting for slow operations (I/O, network, timers) — essential to Node's entire performance model.

How to Learn This

1Identify 3 asynchronous operations in a typical backend request (DB query, API call, file read).
2Compare how the same async task looks with callbacks, Promises, and async/await.
3Learn common async pitfalls: unhandled rejections, forgetting to await.

package.json

Callbacks

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 Callbacks Promises Async/Await Streams Buffers File System (fs)Process & Environment Variables Event Emitter Child Processes Clustering

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