---
title: "WebSocket.send(data) | Grafana k6 documentation"
description: "Send data through the connection."
---

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

# WebSocket.send(data)

Send data through the connection. You can use `JSON.stringify` to convert a JSON or JavaScript values to a JSON string.

Expand table

| Parameter | Type                                          | Description       |
|-----------|-----------------------------------------------|-------------------|
| data      | string / ArrayBuffer / Blob / ArrayBufferView | The data to send. |

### Example

*A k6 script that demonstrates how to add an event listener for the `open` WebSocket connection event sends a message and closes the connection.*

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

```javascript
import { WebSocket } from 'k6/websockets';

export default function () {
  const ws = new WebSocket('ws://localhost:10000');

  ws.onopen = () => {
    ws.send('lorem ipsum');
    ws.close();
  };
}
```

The preceding example uses a WebSocket echo server, which you can run with the following command:

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

```bash
docker run --detach --rm --name ws-echo-server -p 10000:8080 jmalloc/echo-server
```