Upload folder to S3 (Node.JS)

aws.upload-folder-to-s3.js

const AWS = require("aws-sdk"); // from AWS SDK
const fs = require("fs"); // from node.js
const path = require("path"); // from node.js

// configuration
const config = {
  s3BucketName: 'your.s3.bucket.name',
  folderPath: '../dist' // path relative script's location
};

// initialize S3 client
const s3 = new AWS.S3({ signatureVersion: 'v4' });

// resolve full folder path
const distFolderPath = path.join(__dirname, config.folderPath);

// get of list of files from 'dist' directory
fs.readdir(distFolderPath, (err, files) => {

  if(!files || files.length === 0) {
    console.log(`provided folder '${distFolderPath}' is empty or does not exist.`);
    console.log('Make sure your project was compiled!');
    return;
  }

  // for each file in the directory
  for (const fileName of files) {

    // get the full path of the file
    const filePath = path.join(distFolderPath, fileName);
    
    // ignore if directory
    if (fs.lstatSync(filePath).isDirectory()) {
      continue;
    }

    // read file contents
    fs.readFile(filePath, (error, fileContent) => {
      // if unable to read file contents, throw exception
      if (error) { throw error; }

      // upload file to S3
      s3.putObject({
        Bucket: config.s3BucketName,
        Key: fileName,
        Body: fileContent
      }, (res) => {
        console.log(`Successfully uploaded '${fileName}'!`);
      });

    });
  }
});

I fixed few minor errors with paths / other things and
published this as a package

https://www.npmjs.com/package/s3-upload-folder/v/latest

the source (MIT)

https://github.com/Prozi/s3-upload-folder/blob/main/index.js

uses standard S3 sdk authentication (need to read about this if you don't know what I mean)

enjoy!