How to get response from S3 getObject in Node js

Question

I am attempting to get data back from S3 and when I use getSignedURL, everything works:

aws.getSignedUrl('getObject', params, function(err, url){
    console.log(url); 
}); 

My params are:

var params = {
              Bucket: "test-aws-imagery", 
              Key: "TILES/Level4/A3_B3_C2/A5_B67_C59_Tiles.par"

I took the URL output to the console and pasted it into a web browser and it downloaded the file I needed. But when I put a breakpoint on one of the consoles. logs, my IDE (NetBeans) throws an error and refuses to show the value of data. 
How can I solve this? Can someone guide me on this?