title: How to create folder or key on s3 using AWS SDK for Node.js?
body: <p>I'm using AWS SDK for Node.js to create a folder or key on s3. I searched on google, but I got nothing. Does anybody know how can I create a folder under my bucket with AWS SDK for Node.js?
  and how can you check if this folder exists in your bucket already?</p>
  
  <p>if you use <code>console.aws.amazon.com</code>, you can create a folder in your bucket easily. it seems I didn't figure it out how to create it with AWS SDK for Node.js?</p>