title: Migrating from Firebase to NodeJS MongoDB
body: <p>I just released my first MVP app on the iOS app store, and its doing really well. The app is essentially a chat application that uses Firebase.</p>
  
  <p>Since I'm using Firebase, it's really hard to do complex queries. And in order for me to add cool features to my app. I need to be able to do that. </p>
  
  <p>I decided to use NodeJs and MongoDB to run my app. However I don't want to kill what I have going right now. Is there any way, to migrate the data I have in Firebase to MongoDB and keep it in sync real time?</p>
  
  <p>I was considering doing an <code>observeSingleEvent</code> to download all the data. and then using <code>childadded</code>, <code>childremoved</code> to keep everything in sync realtime.</p>
  
  <p>Is this going to be an issue if you have a lot of active users on the app?</p>
  
  <p>Also, is there a service that offers to do that?</p>