How to Structure a Production-Grade Node.js + Express Backend (2026)
Most Node.js tutorials stop at app.get('/', ...). Then you land a real project, the codebase hits 40 files, and everything lives in one 800-line index.js. Been there.
After building and reviewing dozens of backends, here's the structure and the handful of decisions that actually keep a Node + Express project maintainable — explained so a beginner can follow, but detailed enough to use at work today.
1. Layer your app: route → controller → service
The single biggest upgrade you can make is to stop putting logic inside routes.
