Node.js Job Queues in Production: BullMQ, Bull, and Worker Threads

Node.js Job Queues in Production: BullMQ, Bull, and Worker Threads Every non-trivial Node.js application eventually hits the same wall: a user action triggers work that takes too long to do synchronously. Send a welcome email. Resize an uploaded image. Generate a PDF. Process a payment webhook. Run an AI inference job. The answer is always the same: put it in a queue, do it in the background, tell the user you've received their request. Job queues decouple the HTTP request from the work. Done right, they also give you retry logic, prioritization, scheduling, observability, and horizontal scaling almost for free. This guide covers the modern Node.js job queue landscape with a deep dive into BullMQ — the library that has largely superseded Bull for new projects. The Queue Landscape in 2026 Three libraries dominate the Node.js job queue space: Library Backend Status When to Use BullMQ Redis ✅ Active New projects, TypeScript, advanced features Bull Redis ⚠️ Maintenance Legacy code, migrati