CookieStore: change event

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

A change event is fired at a CookieStore object when a change is made to any cookie.


Use the event name in methods like addEventListener(), or set an event handler property.

cookieStore.addEventListener("change", (event) => { })

cookieStore.onchange = (event) => { }


To be informed when a cookie has changed, you can add a handler to the cookieStore instance using addEventListener(), like this:

cookieStore.addEventListener("change", (event) => {
  console.log("1 change event");

Alternatively, you can use the CookieStore.onchange event handler property to establish a handler for the change event:

cookieStore.onchange = (event) => {
  console.log("1 change event");


Cookie Store API
# intro-monitor
Cookie Store API
# dom-cookiestore-onchange

Browser compatibility

BCD tables only load in the browser