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⚠️ This is the archived documentation for k6 v0.46. Go to the latest version.


A handler for a WebSocket connection close event. For multiple, simultaneous event handlers, use WebSocket.addEventListener().


A k6 script that initiates a WebSocket connection, sends a ping, and closes it using onopen handler. The console should also log WebSocket connection closed from the onclose handler.

import { WebSocket } from 'k6/experimental/websockets';
export default function () {
const ws = new WebSocket('ws://localhost:10000');
ws.onopen = () => {
console.log('WebSocket connection established!');
ws.onclose = () => {
console.log('WebSocket connection closed!');

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