ozzo-validation is a validation package for Go that enables configurable and extensible validation rules using normal language constructs instead of struct tags.
The package addresses the problem of validation in Go applications by providing an alternative to tag-based validation approaches. Rather than embedding validation logic in struct field tags, which can be error-prone and difficult to maintain, ozzo-validation allows developers to express validation rules using standard Go code. This approach makes validation logic more readable, testable, and flexible, since rules can be composed and reused as ordinary functions and values.
Developers should choose this tool if they prefer explicit, code-based validation over declarative tag-based approaches and value the ability to write custom validators without fighting against framework constraints. The package suits projects where validation logic is complex or needs to be shared across multiple types, or where developers want validation errors and rules to be first-class citizens in their codebase rather than hidden in struct metadata. The idiomatic Go style means it integrates naturally with existing Go patterns and does not require learning a domain-specific syntax for validation rules.
The project shows consistent maintenance with regular updates to address issues and incorporate improvements. Development activity demonstrates responsiveness to user feedback and bug reports. The codebase maintains a focus on keeping the API simple and aligned with Go conventions rather than expanding scope unnecessarily.
