There are a variety of options available for storing data, and choosing the right one will depend on your application needs, your expertise, and resources.
Firebase offers Cloud Firestore which is a flexible, scalable NoSQL cloud database that is very easy to use with an Ionic app.
This repo is an Ionic demo app of a Contacts CRUD build with Firebase.
We suggest you to read the companion tutorial that explains all the steps needed in order to set up a Firestore database and connect it with your Ionic application in order to save and fetch data.
If you are looking for an Ionic Starter App with Firestore integration ready to go, you should check Ionic Full Starter App - PRO. It includes many examples and use cases of data handling using Ionic and Firebase.
