This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
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
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 | Status | Comment |
|---|---|---|
| Web Assembly JavaScript API The definition of 'validate()' in that specification. |
Draft | Initial draft definition. |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 57 | 15[2] | 52 (52)[1] | No support | 44 | 11 |
| Feature | Chrome for Android | Android Webview | Edge Mobile | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | 57 | 57 | No support | 52.0 (52)[1] | No support | No support | 11 |
[1] WebAssembly is enabled in Firefox 52+, although disabled in the Firefox 52 Extended Support Release (ESR.)
[2] Currently supported behind the “Experimental JavaScript Features” flag. See this blog post for more details.