WorkerGlobalScope: structuredClone() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2022.

See full compatibility

Note: This feature is only available in Web Workers.

The structuredClone() method of the WorkerGlobalScope interface creates a deep copy of a given value using the structured clone algorithm.

The method also allows transferable objects in the original value to be transferred rather than cloned to the new object. Transferred objects are detached from the original object and attached to the new object; they are no longer accessible in the original object.

Syntax

structuredClone(value)
structuredClone(value, options)

Parameters

value

The object to be cloned. This can be any structured-cloneable type.

options Optional

An object with the following properties:

transfer: An array of transferable objects that will be moved rather than cloned to the returned object.

Return value

A deep copy of the original value.

Exceptions

DataCloneError DOMException: Thrown if any part of the input value is not serializable.

Description

See Window.structuredClone() for details of this function.

Examples

See Window.structuredClone() for examples.

Specifications

Specification
HTML # dom-structuredclone

Browser compatibility

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`structuredClone`	Chrome – Full support Chrome 98 (Release date: 2022-02-01) footnote Full support	Edge – Full support Edge 98 (Release date: 2022-02-03) footnote Full support	Firefox – Full support Firefox 94 (Release date: 2021-11-02) footnote Full support	Opera – Full support Opera 84 (Release date: 2022-02-16) footnote Full support	Safari – Full support Safari 15.4 (Release date: 2022-03-14) footnote Full support	Chrome Android – Full support Chrome Android 98 (Release date: 2022-02-01) footnote Full support	Firefox for Android – Full support Firefox for Android 94 (Release date: 2021-11-02) footnote Full support	Opera Android – Full support Opera Android 68 (Release date: 2022-03-30) footnote Full support	Safari on iOS – Full support Safari on iOS 15.4 (Release date: 2022-03-14) footnote Full support	Samsung Internet – Full support Samsung Internet 18 (Release date: 2022-08-08) footnote Full support	WebView Android – Full support WebView Android 98 (Release date: 2022-02-01) footnote Full support	WebView on iOS – Full support WebView on iOS 15.4 (Release date: 2022-03-14) footnote Full support	Bun – Full support Bun 1 (Release date: 2023-09-08) footnote Full support	Deno – Partial support Deno 1.13 – 1.13 (Release date: 2021-08-10) footnote Partial support footnote The `message` parameter does not support cloning `Blob` values. footnote The `transfer` parameter does not accept `ArrayBuffer` items. Passing an `ArrayBuffer` results in an error being thrown. Deno – Full support Deno 1.14 (Release date: 2021-09-14) footnote footnote The `message` parameter does not support cloning `Blob` values.	Node.js – Full support Node.js 17 (Release date: 2021-10-19) footnote Full support

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Full support: Full support
Partial support: Partial support
: See implementation notes.
: Has more compatibility info.

WorkerGlobalScope: structuredClone() method

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