> ## Documentation Index
> Fetch the complete documentation index at: https://docs.extend.app/llms.txt
> Use this file to discover all available pages before exploring further.

# The EvaluationSetItem object

The EvaluationSetItem object represents an item in an evaluation set in Extend. Items are the individual files and expected outputs that are used to evaluate the performance of a given processor in Extend.

<Expandable title="properties" defaultOpen>
  <ResponseField name="object" type="string">
    The type of the object, in this case it will always be "evaluation\_set\_item".
  </ResponseField>

  {" "}

  <ResponseField name="id" type="string">
    The evaluation set item ID.
  </ResponseField>

  {" "}

  <ResponseField name="evaluationSetId" type="string">
    The ID of the evaluation set that this item belongs to.
  </ResponseField>

  {" "}

  <ResponseField name="fileId" type="string">
    The ID of the file associated with this item.
  </ResponseField>

  <ResponseField name="expectedOutput" type="object">
    The expected output of the processor when run against the file.

    This should be a JSON object conforming to the [output type schema](/api-reference/guides/output_types) of the processor.
  </ResponseField>

  <ResponseField name="createdAt" type="string">
    The date and time the evaluation set item was created.
  </ResponseField>

  <ResponseField name="updatedAt" type="string">
    The date and time the evaluation set item was last updated.
  </ResponseField>
</Expandable>

<ResponseExample>
  ```json Example EvaluationSetItem theme={null}
  {
    "object": "evaluation_set_item",
    "id": "eval_item_1234",
    "evaluationSetId": "eval_set_1234",
    "fileId": "file_1234",
    "expectedOutput": {
      // Output object - see “Processor output types” for details
    },
    "createdAt": "2024-01-01T00:00:00Z",
    "updatedAt": "2024-01-01T00:00:00Z"
  }
  ```
</ResponseExample>