Extract image in Docker

Question

I want to download image as a blob or tar from Docker, to push somewhere as a file. Using docker-registry-client in NodeJS with method createBlobReadStream, somwhow take blob file but it is only conf file of image.

    async function createReadStream(DIGEST) {
    client.createBlobReadStream({ digest: DIGEST }, function (err, stream) {
        if (err) {
            console.log(err)
            client.close();
            return
        }
        console.log('Got a digest %s', DIGEST);
        var fout = fs.createWriteStream(`//wsl$//docker-desktop-data//version-pack-data//community//docker//image//overlay2//imagedb//content//sha256//blob-${DIGEST}.file`);
        fout.on('finish', function () {
            console.log('Done downloading blob', DIGEST);
        });
        fout.on('error', function (err) {
            console.log(err)
        })
        stream.pipe(fout);
        stream.resume();
        client.close();
    })
}

There is addittional things I should mention:

1. All actions done in Windows 10, Docker with Linux containers
2. NodeJS as platform and docker-registry-client as library.
3. Docker data stores in ext4.vhdx

Where to extract blob or tar of just created Docker image with NodeJS?