# BaseTransformOutputParser

> **Class** in `langchain_core`

📖 [View in docs](https://reference.langchain.com/python/langchain-core/output_parsers/transform/BaseTransformOutputParser)

Base class for an output parser that can handle streaming input.

## Signature

```python
BaseTransformOutputParser(
    self,
    *args: Any = (),
    **kwargs: Any = {},
)
```

## Extends

- `BaseOutputParser[T]`

## Methods

- [`transform()`](https://reference.langchain.com/python/langchain-core/output_parsers/transform/BaseTransformOutputParser/transform)
- [`atransform()`](https://reference.langchain.com/python/langchain-core/output_parsers/transform/BaseTransformOutputParser/atransform)

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/311675a517f51ec6c77454124293c58df517e952/libs/core/langchain_core/output_parsers/transform.py#L28)