Humanize go-playground/validator validation errors and make it a bit more readable

validator-humanizer.go

package govalidatorhumanizer // you can change this

import (
	"fmt"
	"strings"

	ut "github.com/go-playground/universal-translator"
	en_translations "gopkg.in/go-playground/validator.v9/translations/en"

	"github.com/go-playground/locales/en"
	"gopkg.in/go-playground/validator.v9"
)

// usage: `err := govalidatorhumanizer.HumanizeErrMsg(err)`

var (
	translatr ut.Translator
	validatr  *validator.Validate
)

func init() {
	localeEN := en.New()
	uniTranslator := ut.New(localeEN)

	translatr, _ = uniTranslator.GetTranslator("en")
	validatr = validator.New()

	en_translations.RegisterDefaultTranslations(validatr, translatr)
}

func HumanizeErrMsg(err error) error {
	if verr, yes := err.(validator.ValidationErrors); yes {
		errstr := []string{}
		for _, e := range verr {
			errstr = append(errstr, e.Translate(translatr))
		}
		return fmt.Errorf(strings.ToLower(strings.Join(errstr, "; ")))
	}

	return err
}