WebAssembly.Instance

A WebAssembly.Instance object is a stateful, executable instance of a WebAssembly.Module. Instance objects contain all the Exported WebAssembly functions that allow calling into WebAssembly code from JavaScript.

Constructor

WebAssembly.Instance(): Creates a new Instance object.

`Instance` instances

All Instance instances inherit from the Instance() constructor's prototype object — this can be modified to affect all Instance instances.

Instance properties

Instance.prototype.constructor: Returns the function that created this object's instance. By default this is the WebAssembly.Instance() constructor.
Instance.prototype.exports Read only: Returns an object containing as its members all the functions exported from the WebAssembly module instance, to allow them to be accessed and used by JavaScript.

Instance methods

None.

Specifications

Specification
WebAssembly JavaScript Interface The definition of 'Instance' 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
`Instance`	Chrome Full support 57	Edge Full support 16	Firefox Full support 52 Notes Full support 52 Notes Notes Disabled in the Firefox 52 Extended Support Release (ESR).	IE No support No	Opera Full support 44	Safari Full support 11	WebView Android Full support 57	Chrome Android Full support 57	Firefox Android Full support 52 Notes Full support 52 Notes Notes Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android Full support 43	Safari iOS Full support 11	Samsung Internet Android Full support 7.0	nodejs Full support 8.0.0
`Instance()` constructor	Chrome Full support 57	Edge Full support 16	Firefox Full support 52 Notes Full support 52 Notes Notes Disabled in the Firefox 52 Extended Support Release (ESR).	IE No support No	Opera Full support 44	Safari Full support 11	WebView Android Full support 57	Chrome Android Full support 57	Firefox Android Full support 52 Notes Full support 52 Notes Notes Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android Full support 43	Safari iOS Full support 11	Samsung Internet Android Full support 7.0	nodejs Full support 8.0.0
`exports`	Chrome Full support 57	Edge Full support 16	Firefox Full support 52 Notes Full support 52 Notes Notes Disabled in the Firefox 52 Extended Support Release (ESR).	IE No support No	Opera Full support 44	Safari Full support 11	WebView Android Full support 57	Chrome Android Full support 57	Firefox Android Full support 52 Notes Full support 52 Notes Notes Disabled in the Firefox 52 Extended Support Release (ESR).	Opera Android Full support 43	Safari iOS Full support 11	Samsung Internet Android Full support 7.0	nodejs Full support 8.0.0

Legend

Full support: Full support
No support: No support
See implementation notes.: See implementation notes.