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

datastring / ArrayBufferThe data to send.


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');

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