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) {
  const 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