Web/JavaScript/Reference/Global objects/Promise/allSettled

The Promise.allSettled() method returns a promise that resolves after all of the given promises have either fulfilled or rejected, with an array of objects that each describes the outcome of each promise.

It is typically used when you have multiple asynchronous tasks that are not dependent on one another to complete successfully, or you'd always like to know the result of each promise.

In comparison, the Promise returned by Promise.all() may be more appropriate if the tasks are dependent on each other / if you'd like to immediately reject upon any of them rejecting.

Syntax

Promise.allSettled(iterable);

Parameters

iterable: An iterable object, such as an Array, in which each member is a Promise.

Return value

A pending Promise that will be asynchronously fulfilled once every promise in the specified collection of promises has completed, either by successfully being fulfilled or by being rejected. At that time, the returned promise's handler is passed as input an array containing the outcome of each promise in the original set of promises.

However, if and only if an empty iterable is passed as an argument, Promise.allSettled() returns a Promise object that has already been resolved as an empty array.

For each outcome object, a status string is present. If the status is fulfilled, then a value is present. If the status is rejected, then a reason is present. The value (or reason) reflects what value each promise was fulfilled (or rejected) with.

Examples

Using Promise.allSettled

Promise.allSettled([
  Promise.resolve(33),
  new Promise(resolve => setTimeout(() => resolve(66), 0)),
  99,
  Promise.reject(new Error('an error'))
])
.then(values => console.log(values));

// [
//   {status: "fulfilled", value: 33},
//   {status: "fulfilled", value: 66},
//   {status: "fulfilled", value: 99},
//   {status: "rejected",  reason: Error: an error}
// ]

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'Promise.allSettled' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`allSettled()`	Chrome Full support 76	Edge Full support 79	Firefox Full support 71	IE No support No	Opera Full support 63	Safari Full support 13	WebView Android Full support 76	Chrome Android Full support 76	Firefox Android No support No	Opera Android Full support 54	Safari iOS Full support 13	Samsung Internet Android No support No	nodejs Full support 12.9.0

Legend

Full support: Full support
No support: No support

Implementation Progress

The following table provides a daily implementation status for this feature, because this feature has not yet reached cross-browser stability. The data is generated by running the relevant feature tests in Test262, the standard test suite of JavaScript, in the nightly build, or latest release of each browser's JavaScript engine.