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The simple answer is that you need a database! How to setup a mobile or web app to communicate with a database is more involved than makes sense for this response, but I will point you in the direction of a JavaScript oriented approach: https://teamtreehouse.com/library/build-a-rest-api-with-express.

This tutorial will teach you about running JavaScript on a server that can then be used to a pass data between client side apps and databases.

There is a bunch of foundational knowledge that I recommend having before taking on that course, though. The full-stack JavaScript track will help you build that foundation in a logic order.

Hi, Brent.

It depends. Are you building this vanilla, or are you using a framework? Lots of frameworks give you a few different options. For instance, if the framework provides a wrapper to access native components, then you can store it on the device itself. Additionally, SQLlite is a library you can use that will act as a database that lives within your application.

If you're building this without a framework, then your options would be adding a SQLite library, or using a database. Google offers a great database for hybrid apps called Firebase