aws-upload.js

var AWS = require('aws-sdk');
AWS.config.update({accessKeyId: '{my_access_id}', secretAccessKey: '{my_secret_key}'});
var s3 = new AWS.S3();
 
var params = {
Bucket: 'bucket_name',
                Key: key,
                ACL: 'public-read',
                Body:  file_name
};


//This doesn't work 
var request = s3.putObject(params, function (err, data) {
      //Do something after the file is uploaded
};


//This works
var request = s3.client.putObject(params, function (err, data) {
      //Do something after the file is uploaded
};