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# getClassifierById()

The `getClassifierById()` method retrieves a classifier by searching for its `id` property, then falls back to the registration key.

## Usage example

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

const safety = mastra.getClassifierById('safety')
```

## Parameters

**id** (`string`): The id property of the classifier to retrieve, or its registration key.

## Returns

**classifier** (`Classifier`): The Classifier instance with the matching id or key.

## Error handling

This method throws a `MastraError` with id `MASTRA_GET_CLASSIFIER_BY_ID_NOT_FOUND` if no classifier matches the specified id or key.

## Related

- [getClassifier()](https://mastra.ai/reference/core/getClassifier): Get a classifier by its registration key
- [listClassifiers()](https://mastra.ai/reference/core/listClassifiers): Get all registered classifiers