Promises

Summary

An object representing the eventual result of an async operation, with `.then()`/`.catch()` for handling success and failure — the modern foundation of async Node.js code.

How to Learn This

1Wrap a callback-based Node API (like `fs.readFile`) in a Promise.
2Practice `Promise.all()` to run multiple async DB/API calls in parallel.
3Learn `Promise.allSettled()` for handling a mix of successes and failures.

Callbacks

Async/Await

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

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