index.md

---

title: alarms.clearAll()
slug: Mozilla/Add-ons/WebExtensions/API/alarms/clearAll
page-type: webextension-api-function
tags:
  - API
  - Add-ons
  - Extensions
  - Method
  - Non-standard
  - Reference
  - WebExtensions
  - alarms
  - clearAll
browser-compat: webextensions.api.alarms.clearAll

---

{{AddonSidebar()}}

Cancels all active alarms.

This is an asynchronous function that returns a Promise.

Syntax

let clearAlarms = browser.alarms.clearAll()

Parameters

None.

Return value

A Promise that will be fulfilled with a boolean. This will be true if any alarms were cleared, false otherwise. Note that Chrome always passes true here.

Examples

function onClearedAll(wasCleared) {
  console.log(wasCleared); // true/false
}

let clearAlarms = browser.alarms.clearAll();
clearAlarms.then(onClearedAll);

{{WebExtExamples}}

Browser compatibility

{{Compat}}

Note: This API is based on Chromium's chrome.alarms API.