Uploading files to S3 validating ContentMD5 using AWS SDK for Node.js

s3upload.js

var aws = require('aws-sdk'),
    fs = require('fs'),
    crypt = require("crypto");

function getMD5HashFromFile(file){
    var hash = crypt.createHash("md5")
        .update(file)
        .digest("base64");
    return hash;
}

fs.readFile('demo-diebold.txt', function (err, data) {
  if (err) { throw err; }

  var fileData = new Buffer(data, 'binary');
  var md5Hash = getMD5HashFromFile(data);

  var s3 = new aws.S3();
  s3.putObject({
    Bucket: 'megasenateste',
    Key: 'diebold-demo.txt',
    Body: fileData,
    ContentMD5: md5Hash
  },function (resp) {
    console.log(arguments);
  });
});

Thank you for making my Friday morning just a little easier :)
new Buffer() is deprecated nowadays in favour of Buffer.from().

how can I use this S3 validating ContentMD5 using AWS SDK in pure javascript?

Hi, how can I get the Hash from an uploaded file via ApiGateway (Base64). Thanks