BullMQ

Backend

BullMQ is a powerful Redis-based job and message queue library for Node.js.

BullMQ enables reliable background processing in Node.js applications through a Redis-based queue. The library offers job priorities, delays, repeatable jobs and extensive event hooks. SW Business Solutions uses BullMQ for all asynchronous background tasks, from email processing to automatic slot generation.

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Why BullMQ?

Redis-based persistence for reliable jobs

Job priorities and delays

Repeatable jobs with configurable backoff strategies

Extensive event hooks and monitoring

Excellent NestJS integration

Use Cases for BullMQ

Email Processing

Asynchronous sending of confirmation and notification emails without blocking the main process.

Slot Generation

Automatic generation of booking time slots from opening hours in the background.

Payment Processing

Reliable processing of webhook events for Stripe and PayPal with automatic retries.

Data Exports

Asynchronous generation of large CSV or PDF exports without timeout issues.

Works well with

Frequently Asked Questions about BullMQ

What is the difference between BullMQ and Bull?

BullMQ is the modern successor to Bull with TypeScript support, better scalability and a redesigned API. SW Business Solutions uses exclusively BullMQ in new projects.

How reliable is BullMQ during server restarts?

BullMQ stores all jobs in Redis, so they are automatically reprocessed after a restart. Running jobs are re-queued.

How does BullMQ integrate with NestJS?

Via the official @nestjs/bullmq package, BullMQ can be seamlessly integrated as a module. Queues, workers and processors are defined as NestJS injectable services.

Can BullMQ be scaled horizontally?

Yes, multiple worker instances can process the same Redis queue in parallel. SW Business Solutions uses this for compute-intensive background tasks.