java.time API implementation in Scala and Scala.js

Automatic codec derivation for Circe (based on Shapeless)

ZIO Test is Scala library for writing functional tests with support for Resources, Effects, Property-Based Testing, Aspects, etc.

Core http4s library for servers and clients

circe literal

Fast, secure JSON library with tight ZIO integration.

jsoniter-scala-core

tapir-core

cats-effect-kernel

ZIO Prelude is an alternative approach to functional abstractions in Scala, which throws out the classic functor hierarchy in favor of a modular algebraic approach that is smaller, easier to understand and teach, and more expressive.

java.time API implementation in Scala and Scala.js