Valgo

Valgo is a type-safe, expressive, and extensible validator library for Golang. Valgo is built with generics, so Go 1.18 or higher is required.

Valgo differs from other Golang validation libraries in that the rules are written in functions and not in struct tags. This allows greater flexibility and freedom when it comes to where and how data is validated.

Additionally, Valgo supports customizing and localizing validation messages.