package main import ( "reflect" "sync" "github.com/gin-gonic/gin/binding" "gopkg.in/go-playground/validator.v9" ) type defaultValidator struct { once sync.Once validate *validator.Validate } var _ binding.StructValidator = &defaultValidator{} func (v *defaultValidator) ValidateStruct(obj interface{}) error { if kindOfData(obj) == reflect.Struct { v.lazyinit() if err := v.validate.Struct(obj); err != nil { return error(err) } } return nil } func (v *defaultValidator) lazyinit() { v.once.Do(func() { v.validate = validator.New() v.validate.SetTagName("binding") // add any custom validations etc. here }) } func kindOfData(data interface{}) reflect.Kind { value := reflect.ValueOf(data) valueType := value.Kind() if valueType == reflect.Ptr { valueType = value.Elem().Kind() } return valueType }