Airtable is slowly becoming my new favorite service. It is had to recommend another piece of productivity software as there are a million already but Airtable is something that is unquote and worth looking at getting into your workflow.
Airtables has a very simple API that can help you prototype your app idea and store text for you. It can also help you build a data structure that is going to feed into your app as well.
There are a lot of use cases for your app in prototyping and developing ideas. But, there are still some good uses cases to use as long as you use a serverless function to hide your API key. You can use it as a quick database to make a get request from and full out your application.