Convert GUID to byte array in Javascript

guidToByteArray.md

It is so painful for me when I found there is no code did such so simple thing on the Internet in a simple way. So I did it.

function guidToBytes(guid) {
    var bytes = [];
    guid.split('-').map((number, index) => {
        var bytesInChar = index < 3 ? number.match(/.{1,2}/g).reverse() :  number.match(/.{1,2}/g);
        bytesInChar.map((byte) => { bytes.push(parseInt(byte, 16));})
    });
    return bytes;
}

guid id format: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX

You've literally just saved me hours. Thanks for this.

Agreed, thanks. This is great

If you have access to Buffer() this is a one liner.

Buffer.from(guid.replace('-',''), 'hex')

EDIT: So fun fact, this one liner doesn't work!

C# and others don't encode GUID/UUID bytes the way its done visually. They actually change the endianness of the first few parts. Funny enough, this was accounted for in the code above!

If you have access to Buffer() this is a one liner.

Buffer.from(guid.replace('-',''), 'hex')

🔥 🔥 🔥

This was made in 2016 I bet there are more and better ways to deal with it now.