using mongoDB with heroku on production - node.js

I'm using nodejs as a backend, an mongoDB as a database.
I have free atlas on mongodb and a free dyno on heroku for developing.
I'll finish developig my App soon and I'll have to buy production plans of both heroku and mongoDB so,
MY QUESTION is, is there a mongoDB that I can install on heroku and use it along with my heroku app?? or do I have to buy an Atlas and connect it to heroku?

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Please share more information as my preliminary guess is that if you are using MongoDB then you cant run it on shared hosting you should use some other DB like Atlas MongoDB or Mlab
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THANKS
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