Conditional Validation Rules in Go

Real validation often depends on context. A field may be required only for a specific account type, an address may be required only when shipping physical goods, or one validation branch may depend on a previous result.

Valgo keeps those conditions in Go code instead of encoding them into tag strings.

Gate rules with Go logic

Use ordinary Go conditions around validation calls when the condition belongs to the surrounding workflow:

checks := []v.Validator{
  v.String(input.Email, "email").Not().Blank().Email(),
}

if input.RequiresCompanyName {
  checks = append(checks, v.String(input.CompanyName, "company_name").Not().Blank())
}

val := v.Is(checks...)

Use validation chain flow

Valgo also supports conditional validation flows inside a validation session. This helps when a follow-up validation should run only after a previous branch is valid.

For the API surface, see Conditional Validation in Go and Conditional Validation Rules in Go.