How to upload multiple files which are stored as buffer to s3 bucket using node js

Hope this will help, Just loop on your unzipped files and send each

var AWS = require('aws-sdk');
var fs = require('fs');


module.exports.UploadFile = function(credentials, BucketPath, folder, Region, fname, s3url, req, res, callback) {
        // AWS Region
        AWS.config.region = Region;
        // AWS credentials
        AWS.config.update(credentials);

        // create read stream for file
        var filestream = fs.createReadStream(fname);
        //create an instance of s3
        var s3 = new AWS.S3({params: {Bucket: BucketPath}});
        // read file
        fs.readFile(fname, function (err, data) {
        //upload to s3
        s3.upload({ Key: folder + fname
                  , Body: filestream
                    // change contentType as needed
                  , ACL: 'public-read','ContentType' : 'application/pdf'}
                      , function(err,result) {
                       if(err) throw err;
                       // check if the file uploaded or not
                       s3.getObject({ Key: folder + fname },
                        function (error, data) {
                        if (error != null) {

                        } else {
                            // remove file from local if needed
                            fs.unlink(fname, function (err) {
                           if (err) {
                               console.log(err);
                           }
                           callback("", data);

                       });
                       }
                    });

           });
        });
};