What are common Node.js backend mistakes ?

Async error swallows, monoliths, event loop blocks—top culprits per prod audits.

How to fix unhandled promise rejections in Express?

Try/catch with next(err), or express-async-errors lib.

Src split: routes, controllers, services—keeps it navigable past 10k LOC.

Node.js backends crumble under repeated mistakes that pros should dodge. Here's the data-driven takedown—and fixes that actually scale.

theAIcatchup Apr 11, 2026 3 min read

Wrap async routes in try/catch or use express-async-errors to catch silent failures. 𝕏
Split monoliths into routes/controllers/services for testability and scale. 𝕏
Offload sync heavies to workers/queues—protect that event loop. 𝕏

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#Express.js #Node.js #backend mistakes #error handling #event-loop

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Originally reported by dev.to