Idiomatic way to validate structs

I don’t see any other way to do this quickly. But I found a go package which can help you with this: https://github.com/go-validator/validator

The README file gives this example:

type NewUserRequest struct {
    Username string `validator:"min=3,max=40,regexp=^[a-zA-Z]$"`
    Name string     `validator:"nonzero"`
    Age int         `validator:"min=21"`
    Password string `validator:"min=8"`
}

nur := NewUserRequest{Username: "something", Age: 20}
if valid, errs := validator.Validate(nur); !valid {
    // values not valid, deal with errors here
}