> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/taskforcesh/bullmq/llms.txt
> Use this file to discover all available pages before exploring further.

# FIFO & LIFO

> Control the order in which jobs are processed

## FIFO (First-In, First-Out)

The FIFO type is the standard job processing order in BullMQ. Jobs are processed in the same order as they are inserted into the queue.

<Note>
  The order is preserved independently of the number of processors you have. However, with multiple workers or concurrency greater than 1, jobs may complete in a slightly different order since some jobs take more time to complete than others.
</Note>

```typescript theme={null}
import { Queue } from 'bullmq';

const myQueue = new Queue('Paint');

// Add a job that will be processed after all others
await myQueue.add('wall', { color: 'pink' });
```

### Job Options

When adding jobs to the queue, you can specify various options to control their lifecycle:

```typescript theme={null}
await myQueue.add(
  'wall',
  { color: 'pink' },
  { removeOnComplete: true, removeOnFail: 1000 },
);
```

In this example:

* All completed jobs will be removed automatically
* The last 1000 failed jobs will be kept in the queue

### Default Job Options

To apply the same options to all jobs, use `defaultJobOptions` when instantiating the Queue:

```typescript theme={null}
const queue = new Queue('Paint', { 
  defaultJobOptions: {
    removeOnComplete: true, 
    removeOnFail: 1000
  }
});
```

## LIFO (Last-In, First-Out)

In some cases, it's useful to process jobs in LIFO fashion, where the newest jobs are processed **before** older ones.

```typescript theme={null}
import { Queue } from 'bullmq';

const myQueue = new Queue('Paint');

// Add a job that will be processed before all others
await myQueue.add('wall', { color: 'pink' }, { lifo: true });
```

<Warning>
  LIFO jobs bypass the normal queue order. Use this option carefully to avoid starving older jobs.
</Warning>

## Related Interfaces

From `src/classes/job.ts:211`:

```typescript theme={null}
interface JobsOptions {
  /**
   * If true, adds the job to the right of the queue instead of the left
   * @defaultValue false
   */
  lifo?: boolean;
  
  /**
   * If true, removes the job when it successfully completes
   */
  removeOnComplete?: boolean | number | KeepJobs;
  
  /**
   * If true, removes the job when it fails after all attempts
   */
  removeOnFail?: boolean | number | KeepJobs;
}
```

<Card title="API Reference" icon="code" href="https://api.docs.bullmq.io/classes/v5.Queue.html#add">
  View the complete Add Job API Reference
</Card>