BullMQ

Background processing in Node.js applications is the focus of BullMQ, a job-queue library that stores queue data in Redis. Applications add jobs to a queue, and workers process them separately from the request that created them. This makes it useful for work that can happen later, such as processing uploaded files or carrying out a lengthy operation without keeping a web request open.

BullMQ supports delayed jobs and priorities, with retry controls for failed work and parent-child relationships for dependent jobs. Redis operations help coordinate queue state when multiple workers are active. It suits JavaScript and TypeScript teams that need a shared background-work system and are prepared to operate Redis alongside their application. Its distinction from a process supervisor is important: it manages queued work and worker coordination, rather than serving as a general tool for restarting arbitrary programs.