I am trying to upload a file with upload method using AWS s3 in express js http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#upload-property.

var params ={
            Bucket:'lambdacushbu',
            Key:req.files.image.name,
            Body:req.files.image.data
        }
        var options ={
            partSize: 2 * 1024 * 1024, queueSize: 1
        };
        s3.upload(params,options,function(err, data) {
            if (err) console.log(err, err.stack); // an error occurred
            else     {
                console.log("uploaded",data);
                res.json({
                    'status':'Uploaded'
                });
            }           // successful response
        });

But i got the following error.

s3.upload is not a function

When i try with PutObject method it works fine.