WebAssembly.validate()

The WebAssembly.validate() function validates a given typed array of WebAssembly binary code, returning whether the bytes form a valid wasm module (true) or not (false).

Syntax

WebAssembly.validate(bufferSource);

Parameters

bufferSource
A typed array or ArrayBuffer containing WebAssembly binary code to be validated.

Return value

A boolean that specifies whether bufferSource is valid wasm code (true) or not (false).

Exceptions

If bufferSource is not a typed array or ArrayBuffer, a TypeError is thrown.

Examples

Using validate

The following example (see the validate.html source code, and see it live too) fetches a .wasm module and converts it into a typed array. The validate() method is then used to check whether the module is valid.

fetch('simple.wasm').then(response =>
  response.arrayBuffer()
).then(function(bytes) {
  var valid = WebAssembly.validate(bytes);
  console.log("The given bytes are "
    + (valid ? "" : "not ") + "a valid wasm module");
});

Specifications

Specification
WebAssembly JavaScript Interface
The definition of 'validate()' in that specification.

Browser compatibility

DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
validateChrome Full support 57Edge Full support 16Firefox Full support 52
Notes
Full support 52
Notes
Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Firefox Android Full support 52
Notes
Full support 52
Notes
Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android Full support 43Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0

Legend

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

See also