Validate

validate is a generic Go data validate and filter tool library.

• Support quick validate Map, Struct, Request(Form, JSON, url.Values, UploadedFile) data
  • Validating http.Request automatically collects data based on the request Content-Type value
  • Supports checking each child value in a slice. eg: v.StringRule("tags.*", "required|string")
• Support filter/sanitize/convert data before validate
• Support add custom filter/validator func
• Support scene settings, verify different fields in different scenes
• Support custom error messages, field translates.
  • Can use message, label tags in struct
• Customizable i18n aware error messages, built in en, zh-CN, zh-TW
• Built-in common data type filter/converter. see Built In Filters
• Many commonly used validators have been built in(> 70), see Built In Validators
• Can use validate in any frameworks, such as Gin, Echo, Chi and more
• Supports direct use of rules to validate value. eg: validate.Val("xyz@mail.com", "required|email")

中文说明

中文说明请查看 README.zh-CN

Go Doc

• godoc for gopkg
• godoc for github

Validate Struct

Use the validate tag of the structure, you can quickly config a structure.

Config the struct use tags

Field translations and error messages for structs can be quickly configured using the message and label tags.

• Support configuration field mapping through structure tag, read the value of json tag by default
• Support configuration error message via structure's message tag
• Support configuration field translation via structure's label tag

package main

import (
	"fmt"
	"time"

	"github.com/gookit/validate"
)

// UserForm struct
type UserForm struct {
	Name     string    `validate:"required|min_len:7" message:"required:{field} is required" label:"User Name"`
	Email    string    `validate:"email" message:"email is invalid" label:"User Email"`
	Age      int       `validate:"required|int|min:1|max:99" message:"int:age must int|min:age min value is 1"`
	CreateAt int       `validate:"min:1"`
	Safe     int       `validate:"-"`
	UpdateAt time.Time `validate:"required" message:"update time is required"`
	Code     string    `validate:"customValidator"`
	// ExtInfo nested struct
	ExtInfo struct{
		Homepage string `validate:"required" label:"Home Page"`
		CityName string
	} `validate:"required" label:"Home Page"`
}

// CustomValidator custom validator in the source struct.
func (f UserForm) CustomValidator(val string) bool {
	return len(val) == 4
}

Config validate use struct methods

validate provides extended functionality:

The struct can implement three interfaces methods, which is convenient to do some customization:

• ConfigValidation(v *Validation) will be called after the validator instance is created
• Messages() map[string]string can customize the validator error message
• Translates() map[string]string can customize field translation

package main

import (
	"fmt"
	"time"

	"github.com/gookit/validate"
)

// UserForm struct
type UserForm struct {
	Name     string    `validate:"required|min_len:7"`
	Email    string    `validate:"email"`
	Age      int       `validate:"required|int|min:1|max:99"`
	CreateAt int       `validate:"min:1"`
	Safe     int       `validate:"-"`
	UpdateAt time.Time `validate:"required"`
	Code     string    `validate:"customValidator"`
	// ExtInfo nested struct
	ExtInfo struct{
		Homepage string `validate:"required"`
		CityName string
	} `validate:"required"`
}

// CustomValidator custom validator in the source struct.
func (f UserForm) CustomValidator(val string) bool {
	return len(val) == 4
}

// ConfigValidation config the Validation
// eg:
// - define validate scenes
func (f UserForm) ConfigValidation(v *validate.Validation) {
	v.WithScenes(validate.SValues{
		"add":    []string{"ExtInfo.Homepage", "Name", "Code"},
		"update": []string{"ExtInfo.CityName", "Name"},
	})
}

// Messages you can custom validator error messages. 
func (f UserForm) Messages() map[string]string {
	return validate.MS{
		"required": "oh! the {field} is required",
		"email": "email is invalid",
		"Name.required": "message for special field",
		"Age.int": "age must int",
		"Age.min": "age min value is 1",
	}
}

// Translates you can custom field translates. 
func (f UserForm) Translates() map[string]string {
	return validate.MS{
		"Name": "User Name",
		"Email": "User Email",
		"ExtInfo.Homepage": "Home Page",
	}
}

Create and validating

Can use validate.Struct(ptr) quick create a validation instance. then call v.Validate() for validating.

package main

import (
  "fmt"

  "github.com/gookit/validate"
)

func main() {
	u := &UserForm{
		Name: "inhere",
	}
	
	v := validate.Struct(u)
	// v := validate.New(u)

	if v.Validate() { // validate ok
		// do something ...
	} else {
		fmt.Println(v.Errors) // all error messages
		fmt.Println(v.Errors.One()) // returns a random error message text
		fmt.Println(v.Errors.OneError()) // returns a random error
		fmt.Println(v.Errors.Field("Name")) // returns error messages of the field 
	}
}

Validate Map

You can also validate a MAP data directly.

package main

import (
"fmt"

"github.com/gookit/validate"
)

func main()  {
	m := map[string]any{
		"name":  "inhere",
		"age":   100,
		"oldSt": 1,
		"newSt": 2,
		"email": "some@email.com",
		"tags": []string{"go", "php", "java"},
	}

	v := validate.Map(m)
	// v := validate.New(m)
	v.AddRule("name", "required")
	v.AddRule("name", "minLen", 7)
	v.AddRule("age", "max", 99)
	v.AddRule("age", "min", 1)
	v.AddRule("email", "email")
	
	// can also
	v.StringRule("age", "required|int|min:1|max:99")
	v.StringRule("name", "required|minLen:7")
	v.StringRule("tags", "required|slice|minlen:1")
	// feat: support check sub-item in slice
	v.StringRule("tags.*", "required|string|min_len:7")

	// v.WithScenes(map[string]string{
	//	 "create": []string{"name", "email"},
	//	 "update": []string{"name"},
	// })
	
	if v.Validate() { // validate ok
		safeData := v.SafeData()
		// do something ...
	} else {
		fmt.Println(v.Errors) // all error messages
		fmt.Println(v.Errors.One()) // returns a random error message text
	}
}

Validate Request

If it is an HTTP request, you can quickly validate the data and pass the verification. Then bind the secure data to the structure.

package main

import (
	"fmt"
	"net/http"
	"time"

	"github.com/gookit/validate"
)

// UserForm struct
type UserForm struct {
	Name     string
	Email    string
	Age      int
	CreateAt int
	Safe     int
	UpdateAt time.Time
	Code     string
}

func main()  {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		data, err := validate.FromRequest(r)
		if err != nil {
			panic(err)
		}

		v := data.Create()
		// setting rules
		v.FilterRule("age", "int") // convert value to int
		
		v.AddRule("name", "required")
		v.AddRule("name", "minLen", 7)
		v.AddRule("age", "max", 99)
		v.StringRule("code", `required|regex:\d{4,6}`)

		if v.Validate() { // validate ok
			// safeData := v.SafeData()
			userForm := &UserForm{}
			v.BindSafeData(userForm)

			// do something ...
			fmt.Println(userForm.Name)
		} else {
			fmt.Println(v.Errors) // all error messages
			fmt.Println(v.Errors.One()) // returns a random error message text
		}
	})

	http.ListenAndServe(":8090", handler)
}

Quick Method

Quick create Validation instance.

• New(data any, scene ...string) *Validation
• Request(r *http.Request) *Validation
• JSON(s string, scene ...string) *Validation
• Struct(s any, scene ...string) *Validation
• Map(m map[string]any, scene ...string) *Validation

Quick create DataFace instance.

• FromMap(m map[string]any) *MapData
• FromStruct(s any) (*StructData, error)
• FromJSON(s string) (*MapData, error)
• FromJSONBytes(bs []byte) (*MapData, error)
• FromURLValues(values url.Values) *FormData
• FromRequest(r *http.Request, maxMemoryLimit ...int64) (DataFace, error)

Create Validation from DataFace

d := FromMap(map[string]any{"key": "val"})
v := d.Validation()

Methods In Validation

• func (v *Validation) Validate(scene ...string) bool Do validating and return is success.
• func (v *Validation) ValidateE(scene ...string) Errors Do validating and return error.

More Usage

Validate Error

v.Errors is map data, top key is field name, value is map[string]string.

// do validating
if v.Validate() {
	return nil
}

// get errors
es := v.Errors

// check
es.Empty() // bool

// returns an random error, if no error returns nil
fmt.Println(v.Errors.OneError())
fmt.Println(v.Errors.ErrOrNil())

fmt.Println(v.Errors) // all error messages
fmt.Println(v.Errors.One()) // returns a random error message text
fmt.Println(v.Errors.Field("Name")) // returns error messages of the field 

Encode to JSON:

• StopOnError=true(default), will only one error

{
    "field1": {
        "required": "error msg0"
    }
}

• if StopOnError=false, will get mul