The Node.js Patterns I Wish I Knew 3 Years Ago

Node.js is amazing for shipping fast. It's also amazing at letting you ship broken things fast. I've built a lot of broken things. Here are the patterns that make Node.js systems not break. Pattern 1: EventEmitter for Internal Pub/Sub import { EventEmitter } from ' events ' ; const orderEvents = new EventEmitter (); async function createOrder ( userId , items ) { const order = await db . orders . create ({ userId , items }); orderEvents . emit ( ' order:created ' , order ); return order ; } orde