govalid

Define validation rules directly in struct tags with a concise syntax like `valid:"req|min:3|max:20"`, making code self-documenting and reducing boilerplate.

Register custom rules using `govalid.Rule`, allowing any validation logic, such as the 'fun' rule in the README that checks for exclamation marks in strings.

Use the `dive` rule to validate elements within pointers, slices, arrays, and nested structs, enabling complex data structures without extra code.

Differentiate between validation errors and internal errors via `govalid.ValidationError`, aiding in debugging and proper error responses, as shown in the error handling example.