Receiving Access Denied when trying to access Amazon AWS S3 service with nodejs

var AWS = require('aws-sdk');
var S3FS = require('s3fs');

AWS.config.update({region: 'us-east-1'});
var options = {}; 
exports.storeMedia = function(req, res){
        var fsImpl = new S3FS('test-bucket', options);
        fsImpl.writeFile('message.txt', 'Hello Node', function (err) {
                  if (err) throw err;
                    console.log('It\'s saved!');
        }); 
}

My code is just a sample code I am trying to test out of the doc samples. I have saved the aws key id and secret in the credentials file under .aws on my macbook. I have already built a user and assigned it access policies such that I am able to get and put objects through the assigned user on AWS Console. What else should I look at? Obviously, I am missing something basic just need a little help over the hump.