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).

bufferSource

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

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

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

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");
});

• WebAssembly overview page
• WebAssembly concepts
• Using the WebAssembly JavaScript API