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; } ord...