---
id: fast-foundation.columndefinition.columndatakey
title: ColumnDefinition.columnDataKey property
hide_title: true
---
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[@microsoft/fast-foundation](./fast-foundation.md) &gt; [ColumnDefinition](./fast-foundation.columndefinition.md) &gt; [columnDataKey](./fast-foundation.columndefinition.columndatakey.md)

## ColumnDefinition.columnDataKey property

Identifies the data item to be displayed in this column (i.e. how the data item is labelled in each row)

<b>Signature:</b>

```typescript
columnDataKey: string;
```