WebAssembly

Baseline

Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2017 10.

* Some parts of this feature may have varying levels of support.

See full compatibility
Learn more

WebAssembly JavaScript WebAssembly .

, WebAssembly ( ). Math , Intl .

WebAssembly.instantiate(): WebAssembly Module Instance API.
WebAssembly.instantiateStreaming(): WebAssembly Module Instance .
WebAssembly.compile(): WebAssembly WebAssembly.Module .
WebAssembly.compileStreaming(): WebAssembly.Module .
WebAssembly.validate(): WebAssembly (true) (false) WebAssembly .

WebAssembly.Global(): Creates a new WebAssembly Global object.
WebAssembly.Module(): Creates a new WebAssembly Module object.
WebAssembly.Instance(): Creates a new WebAssembly Instance object.
WebAssembly.Memory(): Creates a new WebAssembly Memory object.
WebAssembly.Table(): Creates a new WebAssembly Table object.
WebAssembly.CompileError(): Creates a new WebAssembly CompileError object.
WebAssembly.LinkError(): Creates a new WebAssembly LinkError object.
WebAssembly.RuntimeError(): Creates a new WebAssembly RuntimeError object.

(GitHub instantiate-streaming.html ) .wasm . ResultObject . instantiateStreaming() Response promise fetch() .

var importObject = { imports: { imported_func: (arg) => console.log(arg) } };

WebAssembly.instantiateStreaming(fetch("simple.wasm"), importObject).then(
  (obj) => obj.instance.exports.exported_func(),
);

ResultObject exported_func .

Specification
WebAssembly JavaScript Interface # webassembly-namespace

Using the WebAssembly JavaScript API

Help improve MDN

Was this page helpful to you?

Yes No

Learn how to contribute

This page was last modified on 2026 7 15 by MDN contributors.

View this page on GitHub Report a problem with this content

WebAssembly

In this article

Help improve MDN