This is documentation for the next version of Grafana k6 documentation. For the latest stable release, go to the latest version.

Documentation Grafana k6 JavaScript API websockets WebSocket WebSocket.send(data)

WebSocket.send(data)

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

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

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

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