package main import ( "fmt" "gopkg.in/bluesuncorp/validator.v6" ) // User contains user information type User struct { FirstName string `validate:"required"` LastName string `validate:"required"` Age uint8 `validate:"gte=0,lte=130"` Email string `validate:"required,email"` FavouriteColor string `validate:"hexcolor|rgb|rgba"` Addresses []*Address `validate:"required,dive,required"` // a person can have a home and cottage... } // Address houses a users address information type Address struct { Street string `validate:"required"` City string `validate:"required"` Planet string `validate:"required"` Phone string `validate:"required"` } var validate *validator.Validate func main() { config := validator.Config{ TagName: "validate", ValidationFuncs: validator.BakedInValidators, } validate = validator.New(config) address := &Address{ Street: "Eavesdown Docks", Planet: "Persphone", Phone: "none", } user := &User{ FirstName: "Badger", LastName: "Smith", Age: 135, Email: "Badger.Smith@gmail.com", FavouriteColor: "#000", Addresses: []*Address{address}, } // returns nil or ValidationErrors ( map[string]*FieldError ) errs := validate.Struct(user) if errs != nil { fmt.Println(errs) // output: Key: "User.Age" Error:Field validation for "Age" failed on the "lte" tag // Key: "User.Addresses[0].City" Error:Field validation for "City" failed on the "required" tag err := errs["User.Addresses[0].City"] fmt.Println(err.Field) // output: City fmt.Println(err.Tag) // output: required fmt.Println(err.Kind) // output: string fmt.Println(err.Type) // output: string fmt.Println(err.Param) // output: fmt.Println(err.Value) // output: // from here you can create your own error messages in whatever language you wish return } // save user to database }