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Pure Functional HTTP APIs in Scala

Models

Explore building robust Scala models for HTTP APIs using refined types and Cats data structures. Understand how to enforce data validity with NonEmptyList and NonEmptySet, and integrate JSON codecs using Circe for better type safety and reliability in backend services.

We'll cover the following...

Initial implementation

First, we’ll implement our models, which are simple and straightforward. Let’s create a class to store a single translation.

Scala
final case class Translation(lang: String, name: String)

This method works, but we can definitely do better.

Using Option[String] is of no use because both fields have to be set. But a String can always be null and contain a lot of unexpected ...