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Detects events from the browser application.

eventstringThe only accepted event value is 'disconnected'.


The returned promise will be resolved when the Browser disconnects from the browser application. Possible reasons for this might be happening as follows:

  • Closed or crashed browser application.
  • Calling of the browser.close() method.
promiseOn returns a Promise that is resolved when the browser process is disconnected.


import { chromium } from 'k6/x/browser';
import { check, sleep } from 'k6';
export default function() {
const browser = chromium.launch();
check(browser, {
'should be connected after launch': browser.isConnected(),
const handlerCalled = Symbol();
const p = browser.on('disconnected')
// The promise resolve/success handler
.then((val) => {
check(browser, {
'should be disconnected on event': !browser.isConnected(),
return handlerCalled;
// The promise reject/failure handler
}, (val) => {
console.error(`promise rejected: ${val}`);
p.then((val) => {
check(val, {
'the browser.on success handler should be called': val === handlerCalled,
check(browser, {
'should be connected before ending iteration': browser.isConnected(),
// Disconnect from the browser instance.