S3上のjsonをnode.jsで読み込む

var AWS = require('aws-sdk');
var s3 = new AWS.S3();
var params = {
    Bucket: 'bucket.name',
    Key: 'subfolder/test.json'
};
s3.getObject(params, function(err, data) {
    if (err) {
        console.log(err, err.stack);
    } else {
        var object = JSON.parse(data.Body.toString());
        console.log(object);
    }
}