Craft GraphQL APIs in Elixir with Absinthe

Chapter 3Taking User Input

Web APIs need to define and validate input from users, whether it’s used to query information or to modify it. In most web frameworks, this input definition is ad hoc and often mixed in with the business logic of the application. GraphQL takes a more declarative approach, however, by defining input as part of your API schema and supporting type validations as a core feature.

In this chapter, you’ll see that by articulating the rules about our data in the schema, we can have the Absinthe package enforce them for us, allowing our Elixir application code to focus on more core application concerns. This will make our code more readable and easier to maintain.

We’ll dig into the nuts and bolts of user input in GraphQL, ...