# JsonValidity

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/smith/evaluation/config/RunEvalConfig/JsonValidity)

Configuration for a json validity evaluator.

## Signature

```python
JsonValidity()
```

## Extends

- `SingleKeyEvalConfig`

## Properties

- `evaluator_type`

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/be854a130153e51346d83d3b06f959b80f6cbca6/libs/langchain/langchain_classic/smith/evaluation/config.py#L213)