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⚠️ This is the archived documentation for k6 v0.44. Go to the latest version.


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

datastringThe data to send.


import ws from 'k6/ws';
export default function () {
const url = 'ws://';
const response = ws.connect(url, null, function (socket) {
socket.on('open', function () {
socket.send(JSON.stringify({ data: 'hola' }));