WebSocket.send(data)

Send a data string 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.

import { WebSocket } from 'k6/experimental/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:

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