json.dumps vs flask.jsonify

I am not sure I understand the purpose of the flask.jsonify method. I try to make a JSON string from this:

data = {"id": str(album.id), "title": album.title}

but what I get with json.dumps differs from what I get with flask.jsonify.

json.dumps(data): [{"id": "4ea856fd6506ae0db42702dd", "title": "Business"}]
flask.jsonify(data): {"id":…, "title":…}

Obviously I need to get a result that looks more like what json.dumps returns. What am I doing wrong?