> For the complete documentation index, see [llms.txt](https://developer.collibra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.collibra.com/api/graphql/data-access/object-types/masking-metadata.md).

# MaskingMetadata

The meta data about how column masking works in the data source.

```graphql
type MaskingMetadata {
  applicableTypes: [String!]
  defaultMaskExternalName: String
  maskTypes: [MaskType!]
}
```

### Fields

#### applicableTypes ● [`[String!]`](/api/graphql/data-access/scalars/string.md) list scalar <a href="#applicable-types" id="applicable-types"></a>

The data object types on which column masking is applicable.

#### defaultMaskExternalName ● [`String`](/api/graphql/data-access/scalars/string.md) scalar <a href="#default-mask-external-name" id="default-mask-external-name"></a>

The default mask type.

#### maskTypes ● [`[MaskType!]`](/api/graphql/data-access/object-types/mask-type.md) list object <a href="#mask-types" id="mask-types"></a>

The available masking types the data source supports.

### Member Of

[`DataSource`](/api/graphql/data-access/object-types/data-source.md) object