Efficient data exchange and easy development at the same time – all this is promised by the GraphQL query language! A core idea of GraphQL is that clients can select themselves, depending on the use case, which data they request from a server and thus hopefully never read too little or too much data in a request.

After a short introduction to the basics of GraphQL, I will show you how to implement a GraphQL API for your own application. We will look at the basic problems that need to be solved, which GraphQL frameworks exist for Java, how they work and what their particularities are.