AWS SDK with Javascript: Multi-Files Download from S3

const multiFilesStream = (infos) => {
    // using archiver package to create archive object with zip setting -> level from 0(fast, low compression) to 10(slow, high compression) 
    const archive = archiver('zip', { zlib: { level: 5 } });

    for (let i = 0; i < infos.length; i += 1) {
      // using pass through stream object to wrap the stream from aws s3
      const passthrough = new PassThrough();
      s3
        .getObject({
          Bucket: S3_BUCKET,
          Key: infos[i].filename
        })
        .createReadStream(__dirname + '/example.zip')
        .pipe(passthrough);
      // name parameter is the name of the file that the file needs to be when unzipped.
      archive.append(passthrough, { name: infos[i].filename });
    }
    return archive;
};

app.post('/listTst', (req, res) => {
    const packageName = req.body.packageName;
    const userId = req.body.userId;
    const packageAddress = req.body.packageAddress;

    const s3 = new AWS.S3({
        accessKeyId: key',
        secretAccessKey: 'secret'
    });
    var bucketParams = {
        Bucket : S3_BUCKET,
        Prefix : `still-pictures/22f84fbd-460b-cfc0-c716-245732f1887e/`
    };

    // Call S3 to obtain a list of the objects in the bucket
    s3.listObjects(bucketParams, function(err, data) {
        if (err) {
            console.log("Error", err);
        } else {
            const files = [];
            const noOfObjects = data.Contents;
            for (let i = 0; i < noOfObjects.length; i++) {
                files.push(
                    {"filename": noOfObjects[i].Key}
                );
            }
            const mfStream = multiFilesStream(files);

            // res is the response object in the http request. You may want to create your own write stream object to write files in your local machine
            mfStream.pipe(res);

            // use finalize function to start the process
            mfStream.finalize();
        }
    });
});