AWS S3 object listing

Question

I am using AWS-SDK using node.js. I want to list images in a specified folder e.g.

There is a list Object function in AWS-SDK but it is listing all the nested files also.

Here is the code :

var AWS = require('aws-sdk');
AWS.config.update({accessKeyId: 'mykey', secretAccessKey: 'mysecret', region: 'myregion'});
var s3 = new AWS.S3();

var params = { 
  Bucket: 'mystore.in',
  Delimiter: '',
  Prefix: 's/5469b2f5b4292d22522e84e0/ms.files' 
}

s3.listObjects(params, function (err, data) {
  if(err)throw err;
  console.log(data);
});

Is it possible to list all files and folders in this location but not folder (images) content?