Here is Help link to the Mongo DB Connector which is associated with the Qlik Web Connectors Premium package and therefore does require a license, so you will need to reach out to your account manager to discuss things in order to trial it or get an actual license for it, but you can check things out in the Help in the meantime.
To help users find verified answers, please do not forget to use the "Accept as Solution" button on any post(s) that helped you resolve your problem or question. I now work a compressed schedule, Tuesday, Wednesday and Thursday, so those will be the days I will reply to any follow-up posts.