Sync files to S3 automatically whenever they are modified/deleted.

fileWatcherS3Sync.js

var chokidar = require('chokidar')
var AWS = require('aws-sdk')
var fs = require('fs')
var s3 = new AWS.S3()

config = { destBucket: 'YOUR_BUCKET_NAME', directoryToWatch: 'path/to/your/directory/' }

function watchDirs(dirs) {
    watcher = chokidar.watch(dirs, {
        ignored: /[\/\\]\./,
        persistent: true,
        interval: 300
    })

    watcher
        .on('add', function (path) {
            syncFile(path, path, function (err, data) {
                if (err) {
                    console.error('an error occured while uploading the file : ' + path, err)
                } else {
                    console.log('the file "' + path + '" was uploaded successfuly!')
                }
            })
        })
        .on('change', function (path) {
            syncFile(path, path, function (err, data) {
                if (err) {
                    console.error('an error occured while uploading the file : ' + path, err)
                } else {
                    console.log('the file "' + path + '" was uploaded successfuly!')
                }
            })
        })
        .on('unlink', function (path) {
            unSyncFile(path, function (err, data) {
                if (err) {
                    console.error('an error occured while deleting the file : ' + path, err)
                } else {
                    console.log('the file "' + path + '" was deleted successfuly!')
                }
            })
        })
        .on('error', function (error) {
            console.error(error)
        })
        .on('unlinkDir', path => console.log(`Directory ${path} has been removed`))
}

function syncFile(input, output, callback) {
    try {
        var params = { Bucket: config.destBucket, Key: output, Body: fs.createReadStream(input) };
        var options = { partSize: 10 * 1024 * 1024, queueSize: 1 };
        s3.upload(params, options, callback);
    } catch (e) {
        callback(e)
    }
}

function unSyncFile(filepath, callback) {
    var param = {
        Bucket: config.destBucket,
        Key: filepath
    }
    s3.deleteObject(param, callback)
}

watchDirs(config.directoryToWatch)

package.json

{
  "name": "fileWatcherS3Sync",
  "version": "1.0.0",
  "description": "Sync files to S3 automatically whenever they are modified/deleted.",
  "main": "fileWatcherS3Sync.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node fileWatcherS3Sync.js"
  },
  "author": "Abdulsalam Alshallah",
  "license": "ISC",
  "dependencies": {
    "aws-sdk": "^2.124.0",
    "chokidar": "^1.7.0"
  }
}