Uploads a folder and its content to an s3 bucket

s3_upload.js

/**
 * Get variables from command line
 */
let cmd = {};
let args = ['command', 'file', 'bucket', 'src']
process.argv.forEach(function(val, index, array) {
    if (array.length === 4) {
        cmd[args[index]] = val;
    }
});

/**
 * Upload using aws-sdk
 */
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: cmd.bucket,
    folderPath: cmd.src
};

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

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

function uploadFiles(distFolderPath, root='') {
    // 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);
    
            // create new root if its a directory
            if (fs.lstatSync(filePath).isDirectory()) {
                const newRoot = path.join(root, fileName);
                uploadFiles(filePath, newRoot);
                continue;
            }
    
            // read file contents
            fs.readFile(filePath, (error, fileContent) => {
                // if unable to read file contents, throw exception
                if (error) {
                    throw error;
                }

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

Use node command to run node s3_upload.js bucket_name src_folder