simple-node-s3-upload.js

const fs = require('fs');
const { promisify } = require('util');

const uploadFiles = (directoryPath, s3client) => promisify(fs.readdir)(directoryPath)
  .then(files => files.map(fileName => getUploadFileOptions(fileName, directoryPath, AWS_S3_BUCKET_NAME)))
  .then(uploadOptions => Promise.all(uploadOptions.map(option => uploadFile(option, s3client))))
  .catch(e => {
    console.log('Failed to upload files');
    throw e;
  });

const getUploadFileOptions = (fileName, uploadDirectoryPath, bucketName) => ({
  Bucket: bucketName,
  Key: fileName,
  Body: fs.readFileSync(path.join(uploadDirectoryPath, fileName)),
  ContentType: 'text/html',
  ACL: 'public-read'
});

const uploadFile = (options, s3client) => s3client.upload(options).promise()
  .then(data => {
    console.log('Uploaded', data.Key);
    return data;
  })
  .catch(err => {
    console.log('Falied do upload', err);
    throw err;
  });