AsyncFunction

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2017.

The AsyncFunction object provides methods for async functions. In JavaScript, every async function is actually an AsyncFunction object.

Note that AsyncFunction is not a global object. It can be obtained with the following code:

const AsyncFunction = async function () {}.constructor;

AsyncFunction is a subclass of Function.

Constructor

Creates a new AsyncFunction object.

Also inherits instance properties from its parent Function.

These properties are defined on AsyncFunction.prototype and shared by all AsyncFunction instances.

The constructor function that created the instance object. For AsyncFunction instances, the initial value is the AsyncFunction constructor.

The initial value of the [Symbol.toStringTag] property is the string "AsyncFunction". This property is used in Object.prototype.toString().

Note: AsyncFunction instances do not have the prototype property.

Inherits instance methods from its parent Function.

Specification

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This page was last modified on Jul 10, 2025 by MDN contributors.