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

# Null Values

> Check for null values to ensure data completeness and reliability.

## Validator overview

The Null Values validator checks for null values in a specific field to ensure data completeness and reliability. You can configure a null values validator to track the following:

| Metric Type | Description |
| :- | :- |
| Count | The number of null values in the field. |
| Percentage | The percentage of null values in the field. |

For an overview of all validator types, see [Validator Types](https://docs.validio.io/v11.0/docs/validators/validator-types.md).

## Metric configuration parameters

| Parameters | Description |
| :- | :- |
| Metric | Select the metric to calculate. See the Metric Options table. |
| Fields | Select a source field from a list of available fields. You can select multiple fields to batch create individual validators for each field. |
| [Filter](https://docs.validio.io/v11.0/docs/filters.md) | (Optional) Select from a list of filters or create a new filter to specify which records to include. |
| [Window](https://docs.validio.io/v11.0/docs/windows.md) | Select from a list of windows or create a new window to specify how to aggregate the data. |
| [Segmentation](https://docs.validio.io/v11.0/docs/segmentation.md) | (Optional) Apply segmentation to analyze data in separate groups. Default is `Unsegmented`. |

For more information about configuring thresholds, see [Thresholds](https://docs.validio.io/v11.0/docs/thresholds.md).