AWS S3 object listing

Question

I am using aws-sdk using node.js. I want to list images in specified folder e.g.

Answer 1

As mentioned in the comments, S3 doesn't "know" about folders, only keys. You can imitate a folder structure with / in the keys. See here for more information - http://docs.aws.amazon.com/AmazonS3/latest/UG/FolderOperations.html

That said, you can modify your code to something like this:

s3.listObjects(params, function (err, data) {
  if(err) throw 

  //data.contents is an array of objects according to the s3 docs
  //iterate over it and see if the key contains a / - if not, it's a file (not a folder)
  var itemsThatAreNotFolders = data.contents.map(function(content){
    if(content.key.indexOf('/')<0) //if / is not in the key
        return content;
  });

  console.log(itemsThatAreNotFolders);
});

This will check each key to see if it contains a /