go-validator

Yet another validator written in Go.

Features

• strongly-typed validators by type parameters
• i18n support in the standard way
• handling multiple validation errors

Built-in validators

• Required: validates comparable types if the value is not zero-value.
• Length: validates strings if the length of the value is within the range.
• MinLength: see Length.
• MaxLength: see Length.
• InRange: validates ordered types if the value is within the range.
• Min: see InRange.
• Max: see InRange.
• In: validates comparable types if the value is in valid values.
• Pattern: validates strings if it matches the regular expression.

Supported languages

• English
• Japanese

Example

import (
	"context"
	"fmt"

	"github.com/lufia/go-validator"
)

type OIDCProvider int

const (
	Google OIDCProvider = iota + 1
	Apple
	GitHub
)

type CreateUserRequest struct {
	Name     string
	Provider OIDCProvider
	Theme    string
}

var createUserRequestValidator = validator.Struct(func(s validator.StructRule, r *CreateUserRequest) {
	validator.AddField(s, &r.Name, "name", validator.Length[string](5, 20))
	validator.AddField(s, &r.Provider, "provider", validator.In(Google, Apple, GitHub))
	validator.AddField(s, &r.Theme, "theme", validator.In("light", "dark"))
})

func main() {
	var r CreateUserRequest
	err := createUserRequestValidator.Validate(context.Background(), &r)
	fmt.Println(err)
}

For more details, see the documentation.