CompileError: AsyncCompile: Wasm decoding failed: expected magic word 00 61 73 6d, found 3c 21 44 4f @+0]

[Divy123]

I am running my unit tests with tape in which the test is running after browserified. Now when I try running the tests which include my wasm code compiled with web assembly explorer, it shows me this error.

The file is a wasm file and not a wat file.

Please help me with this.

Also noting that the code works in chrome.

[rossberg]

Those bytes are "<!DO" in ASCII, so probably you are trying to load an HTML document.

Anyway, this repo is for the Wasm spec and related issues. I suggest asking your question (with a bit more context) on StackOverflow.

[Divy123]

@rossberg can you please elaborate upon this?

Those bytes are "<!DO" in ASCII, so probably you are trying to load an HTML document.

[rossberg]

The bytes 3c 21 44 4f are the string "<!DO". The error message says that they occur in place of the Wasm "magic word", which should be the first 4 bytes of a valid Wasm module.

[Divy123]

Any possible solution to it?
What can be the cause? I would be really grateful if you can help me with this.

Thanks a ton!!

[Pauan]

What's most likely happening is that when you try to load the .wasm file (using fetch or whatever), the file path is wrong, or the .wasm file doesn't exist on the server, so the server returns a 404 page instead (which is an .html file).

So make sure that your server is configured correctly, that the .wasm file exists on the server, that the file path you are loading is correct, and that you have the right permissions and MIME type setup for the .wasm file (the .wasm file must be served with the MIME application/wasm).

If you're still running into problems, you should ask on StackOverflow, not here.

[Divy123]

Thanks @Pauan , this is something I can proceed with.

[benbatya]

Check your webserver's redirect filter... That worked for me

[nupur711]

Uncaught (in promise) RuntimeError: Aborted(CompileError: WebAssembly.instantiate(): expected magic word 00 61 73 6d, found 3c 21 44 4f @+0) getting this error. It shows that .wasm file is loaded as a html file. If any can help me with the same to know ho to use wasm with nodejs project.