Configuring region in node.js

can someone explain how to fix a missing config error with node.js. I've followed all the examples from the aws doc page (http://ift.tt/1rZeAcn) but i still get this error no matter what.

{ [ConfigError: Missing region in config]
message: 'Missing region in config',
code: 'ConfigError',
time: Wed Jun 24 2015 21:39:58 GMT-0400 (EDT) }>{ thumbnail: 
 { fieldname: 'thumbnail',
 originalname: 'testDoc.pdf',
 name: 'testDoc.pdf',
 encoding: '7bit',
 mimetype: 'application/pdf',
path: 'uploads/testDoc.pdf',
 extension: 'pdf',
 size: 24,
 truncated: false,
 buffer: null } }
 POST / 200 81.530 ms - -

Here is my code:

var express = require('express');
var router = express.Router();
var multer = require('multer');
var done = false;
var AWS = require('aws-sdk');
var dd = new AWS.DynamoDB();
var s3 = new AWS.S3();
var bucketName = 'eaton-resume-bucket';



AWS.config.update({region:'us-east-1'});

router.use(multer({ 
    dest: './uploads/',
    rename: function(fieldname, filename){
        return filename;
    },
onFileUploadStart: function (file, data, req, res) {
    console.log(file.originalname + ' is starting ...')
    var params = {
        Bucket: bucketName,
        Key: file.name,
        Body: data
    };
    s3.putObject(params, function(perr, pres){
        if (perr){
            console.log("Error uploading data: ", perr);
        } else {
            console.log("Successfully uploaded data to Eaton Resume Bucket");
        }
    });
},
onFileUploadComplete: function(file) {
    console.log(file.fieldname + ' uploaded to ' + file.path)
    done = true;
    putItem("test@email.com", "6/5/2015", "Recruiter", "101");
}
}));