Node.js Best Practices in 2026: What Senior Developers Actually Do

These aren't theoretical — they're patterns from production Node.js apps that handle millions of requests. 1. Structure your project by feature, not by type # ❌ Bad — too abstract src/ controllers/ models/ routes/ services/ # ✅ Good — feature-based src/ features/ auth/ auth.controller.js auth.service.js auth.routes.js auth.test.js users/ users.controller.js users.service.js Why? When you work on "users", all relevant code is in one place. No more hunting across 5 folders. 2. Use async/await everywhere, handle errors properly // ❌ Wrong - unhandled promise, crashes the process app . get ( ' /users/:id ' , async ( req , res ) => { const user = await UserService . findById ( req . params . id ); res . json ( user ); }); // ✅ Better - catch errors, pass to error middleware app . get ( ' /users/:id ' , async ( req , res , next ) => { try { const user = await UserService . findById ( req . params . id ); if ( ! user ) return res . status ( 404 ). json ({ error : ' User not found ' }); res .