---
title: "Selection.data([key]) | Grafana k6 documentation"
description: "Return the value at the named data store for the first element in the set of matched elements."
---

> For a curated documentation index, see [llms.txt](/llms.txt). For the complete documentation index, see [llms-full.txt](/llms-full.txt).

# Selection.data(\[key])

Return the value at the named data store for the first element in the set of matched elements. Mimics [jquery.data](https://api.jquery.com/data/)

Expand table

| Parameter      | Type   | Description                               |
|----------------|--------|-------------------------------------------|
| key (optional) | string | A string naming the piece of data to set. |

### Returns

Expand table

| Type   | Description                        |
|--------|------------------------------------|
| string | The value at the named data store. |

### Example

JavaScript ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```javascript
import { parseHTML } from 'k6/html';
import { sleep } from 'k6';

export default function () {
  const content = `
 <h1 data-test-id="data-value">Hola</h1>
  `;

  const doc = parseHTML(content);
  const sel = doc.find('h1');

  console.log(sel.data().testID);
  console.log(sel.data('test-id'));
  console.log(sel.data('testId'));

  sleep(1);
}
```