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# listClassifiers()

The `listClassifiers()` method returns all classifiers that have been registered with the Mastra instance, keyed by registration key.

## Usage example

```typescript
import { mastra } from './mastra'

const classifiers = mastra.listClassifiers()

for (const [key, classifier] of Object.entries(classifiers)) {
  console.log(key, classifier.id)
}
```

## Returns

**classifiers** (`Record<string, Classifier>`): All registered classifiers keyed by registration key.

## Related

- [getClassifier()](https://mastra.ai/reference/core/getClassifier): Get a classifier by its registration key
- [getClassifierById()](https://mastra.ai/reference/core/getClassifierById): Get a classifier by its id property
- [Classifier](https://mastra.ai/reference/classifier/classifier)