Example usage go-playground/validator/v10

validator.go

package main

import (
	"fmt"

	en "github.com/go-playground/locales/en_IN"
	ut "github.com/go-playground/universal-translator"
	"github.com/go-playground/validator/v10"
	entrans "github.com/go-playground/validator/v10/translations/en"
)

type User struct {
	Id       int                `json:"id" bson:"_id,omitempty"`
	Username string             `json:"username" bson:"username" validate:"required,alphanum"`
	Email    string             `json:"email" bson:"email" validate:"required,email"`
	Password string             `json:"password" bson:"password" validate:"required,min=8"`
	Strategy string             `json:"strategy" bson:"strategy"`
	GithubId string             `json:"githubId" bson:"githubId,omitempty"`
	IsAdmin  bool               `json:"isAdmin" bson:"isAdmin"`
}

func main() {
	var u *models.User = &User{
		Username: "ppalone",
		Email:    "p@p.com",
		Password: "passwor",
	}

	v := validator.New()
	err := v.Struct(u)

	// ut
	// universal translator

	// english
	english := en.New()

	uni := ut.New(english, english)
	trans, _ := uni.GetTranslator("en_IN")
	entrans.RegisterDefaultTranslations(v, trans)

	var errors []string = []string{}

	if err != nil {
		// fmt.Println(err.(validator.ValidationErrors))
		for _, e := range err.(validator.ValidationErrors) {
			// fmt.Println(e.Translate(trans))
			errors = append(errors, e.Translate(trans))
		}
	}

	fmt.Print(errors)
}