Front ends are cool but mostly useless without data. Sure, some of your data sources provide REST APIs so you can just write queries directly against them but that is so old school. Instead, you can build back end APIs that address the specific data needs of your web application and relieve front end devs from tangling with database schema, query syntax and other distractions. In this session you’ll learn the basics of creating a back end API as well as some smart architectural guidance to make moving data between your front end and your data store. We'll start with an ASP.NET Core Web API, EF Core and a relational database, then look at a data API built with Azure Functions to support a Cosmos DB document database.