Mongodb is returning wierdly formatted data

Mongodb is returning wierdly formatted data

When i try to get this data from my mongodb database using
flask-restfuland pymongo i get some wierdly formatted data.
For example.
This is what the data looks like in the database.
{ "_id" : ObjectId("5217f3cc7466c06862c4a4f7"), "Hello" : "World" }
This is what it looks like when it gets returned from the database.
"{\"_id\": {\"$oid\": \"5217f3cc7466c06862c4a4f7\"}, \"Hello\": \"World\"}"
Using this code:
def toJSON(data):
return json.dumps(data, default=json_util.default)
And this:
result = collection.find_one({"_id": ObjectId(objectid)})
return toJSON(result)
Anyone know what i'm doing wrong?