Open source


A module with a better and standard API exists.

The new k6/experimental/websockets API partially implements the WebSockets API living standard.

When possible, we recommend using the new API. It uses a global event loop for consistency with other k6 APIs and better performance.

Send a ping. Ping messages can be used to verify that the remote endpoint is responsive.


import ws from 'k6/ws';

export default function () {
  const url = 'ws://';
  const response = ws.connect(url, null, function (socket) {
    socket.on('open', function () {
      socket.on('pong', function () {
        // As required by the spec, when the ping is received, the recipient must send back a pong.
        console.log('connection is alive');