function _decodeBase64ToUtf8(b64string) {
    var buffer;
    if (typeof Buffer.from === "function") {
        // Node 5.10+
        buffer = Buffer.from(b64string, 'base64');
    } else {
        // older Node versions
        buffer = new Buffer(b64string, 'base64');
    }

    return buffer;
}
let data = _decodeBase64ToUtf8(zipBase64)
fs.writeFileSync('banner.zip', data, function (e) {
        if (e) throw e

        console.log('saved!');

    })