# Request unmarshaller

By default, request unmarshaller is selected based on detected specification version.

In order to explicitly validate and unmarshal a:

- OpenAPI 3.0 spec, import `V30RequestUnmarshaller`

- OpenAPI 3.1 spec, import `V31RequestUnmarshaller` or `V31WebhookRequestUnmarshaller`

      from openapi_core import V31RequestUnmarshaller

      config = Config(
         request_unmarshaller_cls=V31RequestUnmarshaller,
      )
      openapi = OpenAPI.from_file_path('openapi.json', config=config)
      result = openapi.unmarshal_request(request)

You can also explicitly import `V3RequestUnmarshaller` which is a shortcut to the latest OpenAPI v3 version.