Sure, it depends on your use case though. For infrequent updates I don't think it's wasteful to just overwrite the file, it seems less wasteful to me than runni

Sure, it depends on your use case though. For infrequent updates I don't think it's wasteful to just overwrite the file, it seems less wasteful to me than running a whole database. But it all depends on your setup :) Also I think updating a sub array in a collection triggers a whole write to that collection in mongodb. In any case I would avoid mongodb if you can, it seems redis might be a better fit for you.