Migrate from Parse.com to Heroku? - mongodb

I'm trying to figure out the steps involved to migrate an app from Parse.com to Heroku I found this:
https://learnappmaking.com/how-to-migrate-parse-app-parse-server-heroku-mongolab/
I'm new to Cordova and parse so I have some questions:
Can Heroku host a MongoDB instance as well as a Parse server, or do I have to get MongoDB somewhere else (mLab, MongoDB Atlas, etc)
This for a Cordova app. Is that valid to migrate to Heroku? I just need a replacement for Parse.com. Thanks.

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Is it compulsory to install add-on in order to deploy Mongo in Heroku?

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I'm new to working with back-end, but have been running into issues trying to get my iOS app to connect to my PostgreSQL DB.
I have developed an app with Swift which is a game that I want to run locally on iOS devices. I have a PostgreSQL DB set up in Google Cloud Platform but I cannot figure out how to get the Swift app to connect to my PostgreSQL DB.
I've read some about using Vapor or Perfect to run the application using Googles App Engine but I'm not sure that is what I want to do since I want the app to run locally but there are a few aspects of my app that I need a global database for.
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Your question is pretty much very similar to this one.
In short, the correct answer is you shouldn't connect your client side application directly to the database. Instead, you should build a service that can connect to the database, and act as a service between your application. This helps prevent any unauthorized queries to your database and provides better performance. If you wanted to do this on GCP, you could look into something like Google Cloud Functions or Google Cloud App Engine to act as a service.
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Could any one tell me the detail for Meteor Deployment A-Z. I know about mupx and I've deployed client's Meteor apps to server. But i wanna know about A-Z detail for which server hosting is best for it and how to use it? And what about mongodb? We use local in development. What when we deploy it? What is the limit of it?
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