var params = {

  Bucket: bucket_name,

  Key: 'test.txt',

  Body: Math.random().toString(),

  ACL: 'public-read',

  Tagging:"hello=world&one=two",

  Metadata: {

    'x-amz-meta-hello-world': 'data here',

    'custom_data': "whatever"

  }

}

s3.upload(params)

Output:
{

  ETag: '"cb4f442e395bcf0bec578533e171537c"',

  VersionId: 'L.OyYlW2AOEcarfmoKlLUbAbOc8X45.',

  Location: 'https://YOURBUCKET.s3.pilw.io/test.txt',

  key: 'test.txt',

  Key: 'test.txt',

  Bucket: YOURBUCKET

}