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 multi error

{
    "field1": {
        "minLen": "error msg1",
        "required": "error msg0"
    },
    "field2": {
        "min": "error msg2"
    }
}

Global Option

You can adjust some processing logic of the validator by changing the global option settings.

// GlobalOption settings for validate
type GlobalOption struct {
	// FilterTag name in the struct tags.
	//
	// default: filter
	FilterTag string
	// ValidateTag in the struct tags.
	//
	// default: validate
	ValidateTag string
	// FieldTag the output field name in the struct tags.
	// it as placeholder on error message.
	//
	// default: json
	FieldTag string
	// LabelTag the display name in the struct tags.
	// use for define field translate name on error.
	//
	// default: label
	LabelTag string
	// MessageTag define error message for the field.
	//
	// default: message
	MessageTag string
	// StopOnError If true: An error occurs, it will cease to continue to verify
	StopOnError bool
	// SkipOnEmpty Skip check on field not exist or value is empty
	SkipOnEmpty bool
	// UpdateSource Whether to update source field value, useful for struct validate
	UpdateSource bool
	// CheckDefault Whether to validate the default value set by the user
	CheckDefault bool
	// CheckZero Whether validate the default zero value. (intX,uintX: 0, string: "")
	CheckZero bool
	// CheckSubOnParentMarked True: only collect sub-struct rule on current field has rule.
	CheckSubOnParentMarked bool
	// ValidatePrivateFields Whether to validate private fields or not, especially when inheriting other other structs.
	//
	//  type foo struct {
	//	  Field int `json:"field" validate:"required"`
	//  }
	//  type bar struct {
	//    foo // <-- validate this field
	//    Field2 int `json:"field2" validate:"required"`
	//  }
	//
	// default: false
	ValidatePrivateFields bool
}

Usage:

// change global opts
validate.Config(func(opt *validate.GlobalOption) {
	opt.StopOnError = false
	opt.SkipOnEmpty = false
})

Validating Private (Unexported fields)

By default, private fields are skipped. It is not uncommon to find code such as the following

type foo struct {
	somefield int
}

type Bar struct {
	foo
	SomeOtherField string
}

In order to have foo.somefield validated, enable the behavior by setting GlobalOption.ValidatePrivateFields to true.

validate.Config(func(opt *validate.GlobalOption) {
	opt.ValidatePrivateFields = true
})

Custom Error Messages

• Register language messages

import "github.com/gookit/validate/locales/zhcn"

// for all Validation.
// NOTICE: must be registered before on validate.New(), it only need call at once.
zhcn.RegisterGlobal()

// ... ...

v := validate.New()

// only for current Validation
zhcn.Register(v)

• Manual add global messages

validate.AddGlobalMessages(map[string]string{
    "minLength": "OO! {field} min length is %d",
})

• Add messages for current validation

v := validate.New(map[string]any{
    "name": "inhere",
})
v.StringRule("name", "required|string|minLen:7|maxLen:15")

v.AddMessages(map[string]string{
    "minLength": "OO! {field} min length is %d",
    "name.minLen": "OO! username min length is %d",
})

• Use struct tags: message, label

type UserForm struct {
    Name  string `validate:"required|minLen:7" label:"User Name"`
    Email string `validate:"email" message:"email is invalid" label:"User Email"`
}

• Use struct method Messages()

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

Add Custom Validator

validate supports adding custom validators, and supports adding global validator and temporary validator.

• Global Validator is globally valid and can be used everywhere
• Temporary Validator added to the current validation instance, only the current validation is available
• Add verification method to the structure. How to use please see the structure verification example above

Note: The validator method must return a bool to indicate whether the validation was successful. The first parameter is the corresponding field value. If there are additional parameters, they will be appended automatically.

Add Global Validator

You can add one or more custom validators at once.

validate.AddValidator("myCheck0", func(val any) bool {
	// do validate val ...
	return true
})
validate.AddValidators(validate.M{
	"myCheck1": func(val any) bool {
		// do validate val ...
		return true
	},
})

Add Temporary Validator

Again, you can add one or more custom validators at once.

v := validate.Struct(u)
v.AddValidator("myFunc3", func(val any) bool {
	// do validate val ...
	return true
})
v.AddValidators(validate.M{
	"myFunc4": func(val any) bool {
		// do validate val ...
		return true
	},
})

Add Custom Filter

validate can also support adding custom filters, and supports adding global filter and temporary filter.

• Global Filter is globally valid and can be used everywhere
• Temporary Filter added to the current validation instance, only the current validation is available

TIP: for filter func, we allow functions with 1 result or 2 results where the second is an error.

Add Global Filter

You can add one or more custom validators at once.

package main

import "github.com/gookit/validate"

func init() {
	validate.AddFilter("myToIntFilter0", func(val any) int {
		// do filtering val ...
		return 1
	})
	validate.AddFilters(validate.M{
		"myToIntFilter1": func(val any) (int, error) {
			// do filtering val ...
			return 1, nil
		},
	})
}

Add Temporary Filter

Again, you can add one or more custom filters at once.

package main

import "github.com/gookit/validate"

func main() {
	v := validate.New(&someStrcut{})

	v.AddFilter("myToIntFilter0", func(val any) int {
		// do filtering val ...
		return 1
	})
	v.AddFilters(validate.M{
		"myToIntFilter1": func(val any) (int, error) {
			// do filtering val ...
			return 1, nil
		},
	})
	// use the added filter
	v.FilterRule("field", "myToIntFilter0")
}

Custom required validation

Allows a custom required validator to customize whether the validation is empty. However, note that the validator name must start with required, e.g. required_custom.

	type Data struct {
		Age  int    `validate:"required_custom" message:"age is required"`
		Name string `validate:"required"`
	}

	v := validate.New(&Data{
		Name: "tom",
		Age:  0,
	})

	v.AddValidator("required_custom", func(val any) bool {
		// do check value
		return false
	})

	ok := v.Validate()
	assert.False(t, ok)

Use on gin framework

Can use validate in any frameworks, such as Gin, Echo, Chi and more.

Examples on gin:

package main
import (
    "github.com/gin-gonic/gin/binding"
    "github.com/gookit/validate"
)

// implements the binding.StructValidator
type customValidator struct {}

func (c *customValidator) ValidateStruct(ptr any) error {
    v := validate.Struct(ptr)
    v.Validate() // do validating
    
    if v.Errors.Empty() {
	return nil
    }

    return v.Errors
}

func (c *customValidator) Engine() any {
    return nil
}

func main()  {
	// ...

    // after init gin, set custom validator
    binding.Validator = &customValidator{}
}

Built In Validators

Camel-style validator names now have underlined aliases. endsWith can also be written as ends_with

validator/aliases	description
required	Check value is required and cannot be empty.
required_if/requiredIf	required_if:anotherfield,value,... The field under validation must be present and not empty if the anotherField field is equal to any value.
requiredUnless	required_unless:anotherfield,value,... The field under validation must be present and not empty unless the anotherField field is equal to any value.
requiredWith	required_with:foo,bar,... The field under validation must be present and not empty only if any of the other specified fields are present.
requiredWithAll	required_with_all:foo,bar,... The field under validation must be present and not empty only if all of the other specified fields are present.
requiredWithout	required_without:foo,bar,... The field under validation must be present and not empty only when any of the other specified fields are not present.
requiredWithoutAll	required_without_all:foo,bar,... The field under validation must be present and not empty only when all of the other specified fields are not present.
-/safe	The field values are safe and do not require validation
int/integer/isInt	Check value is intX uintX type, And support size checking. eg: "int" "int:2" "int:2,12"
uint/isUint	Check value is uint(uintX) type, value >= 0
bool/isBool	Check value is bool string(true: "1", "on", "yes", "true", false: "0", "off", "no", "false").
string/isString	Check value is string type.
float/isFloat	Check value is float(floatX) type
slice/isSlice	Check value is slice type([]intX []uintX []byte []string ...).
in/enum	Check if the value is in the given enumeration "in:a,b"
not_in/notIn	Check if the value is not in the given enumeration "contains:b"
contains	Check if the input value contains the given value
not_contains/notContains	Check if the input value not contains the given value
string_contains/stringContains	Check if the input string value is contains the given sub-string
starts_with/startsWith	Check if the input string value is starts with the given sub-string
ends_with/endsWith	Check if the input string value is ends with the given sub-string
range/between	Check that the value is a number and is within the given range
max/lte	Check value is less than or equal to the given value
min/gte	Check value is greater than or equal to the given value(for intX uintX floatX)
eq/equal/isEqual	Check that the input value is equal to the given value
ne/notEq/notEqual	Check that the input value is not equal to the given value
lt/lessThan	Check value is less than the given value(use for intX uintX floatX)
gt/greaterThan	Check value is greater than the given value(use for intX uintX floatX)
email/isEmail	Check value is email address string.
intEq/intEqual	Check value is int and equals to the given value.
len/length	Check value length is equals to the given size(use for string array slice map).
regex/regexp	Check if the value can pass the regular verification
arr/list/array/isArray	Check value is array, slice type
map/isMap	Check value is a MAP type
strings/isStrings	Check value is string slice type(only allow []string).
ints/isInts	Check value is int slice type(only allow []int).
min_len/minLen/minLength	Check the minimum length of the value is the given size
max_len/maxLen/maxLength	Check the maximum length of the value is the given size
eq_field/eqField	Check that the field value is equals to the value of another field
ne_field/neField	Check that the field value is not equals to the value of another field
gte_field/gteField	Check that the field value is greater than or equal to the value of another field
gt_field/gtField	Check that the field value is greater than the value of another field
lte_field/lteField	Check if the field value is less than or equal to the value of another field
lt_field/ltField	Check that the field value is less than the value of another field
file/isFile	Verify if it is an uploaded file
image/isImage	Check if it is an uploaded image file and support suffix check
mime/mimeType/inMimeTypes	Check that it is an uploaded file and is in the specified MIME type
date/isDate	Check the field value is date string. eg 2018-10-25
gt_date/gtDate/afterDate	Check that the input value is greater than the given date string.
lt_date/ltDate/beforeDate	Check that the input value is less than the given date string
gte_date/gteDate/afterOrEqualDate	Check that the input value is greater than or equal to the given date string.
lte_date/lteDate/beforeOrEqualDate	Check that the input value is less than or equal to the given date string.
has_whitespace/hasWhitespace	Check value string has Whitespace.
ascii/ASCII/isASCII	Check value is ASCII string.
alpha/isAlpha	Verify that the value contains only alphabetic characters
alphaNum/isAlphaNum	Check that only letters, numbers are included
alphaDash/isAlphaDash	Check to include only letters, numbers, dashes ( - ), and underscores ( _ )
multiByte/isMultiByte	Check value is MultiByte string.
base64/isBase64	Check value is Base64 string.
dns_name/dnsName/DNSName/isDNSName	Check value is DNSName string.
data_uri/dataURI/isDataURI	Check value is DataURI string.
empty/isEmpty	Check value is Empty string.
hex_color/hexColor/isHexColor	Check value is Hex color string.
hexadecimal/isHexadecimal	Check value is Hexadecimal string.
json/JSON/isJSON	Check value is JSON string.
lat/latitude/isLatitude	Check value is Latitude string.
lon/longitude/isLongitude	Check value is Longitude string.
mac/isMAC	Check value is MAC string.
num/number/isNumber	Check value is number string. >= 0
cn_mobile/cnMobile/isCnMobile	Check value is china mobile number string.
printableASCII/isPrintableASCII	Check value is PrintableASCII string.
rgb_color/rgbColor/RGBColor/isRGBColor	Check value is RGB color string.
url/isURL	Check value is URL string.
fullUrl/isFullURL	Check value is full URL string(must start with http,https).
ip/isIP	Check value is IP(v4 or v6) string.
ipv4/isIPv4	Check value is IPv4 string.
ipv6/isIPv6	Check value is IPv6 string.
CIDR/isCIDR	Check value is CIDR string.
CIDRv4/isCIDRv4	Check value is CIDRv4 string.
CIDRv6/isCIDRv6	Check value is CIDRv6 string.
uuid/isUUID	Check value is UUID string.
uuid3/isUUID3	Check value is UUID3 string.
uuid4/isUUID4	Check value is UUID4 string.
uuid5/isUUID5	Check value is UUID5 string.
filePath/isFilePath	Check value is an existing file path
unixPath/isUnixPath	Check value is Unix Path string.
winPath/isWinPath	Check value is Windows Path string.
isbn10/ISBN10/isISBN10	Check value is ISBN10 string.
isbn13/ISBN13/isISBN13	Check value is ISBN13 string.

Notice:

• intX is contains: int, int8, int16, int32, int64
• uintX is contains: uint, uint8, uint16, uint32, uint64
• floatX is contains: float32, float64

Built In Filters

Filters powered by: gookit/filter

filter/aliases	description
int/toInt	Convert value(string/intX/floatX) to int type v.FilterRule("id", "int")
uint/toUint	Convert value(string/intX/floatX) to uint type v.FilterRule("id", "uint")
int64/toInt64	Convert value(string/intX/floatX) to int64 type v.FilterRule("id", "int64")
float/toFloat	Convert value(string/intX/floatX) to float type
bool/toBool	Convert string value to bool. (true: "1", "on", "yes", "true", false: "0", "off", "no", "false")
trim/trimSpace	Clean up whitespace characters on both sides of the string
ltrim/trimLeft	Clean up whitespace characters on left sides of the string
rtrim/trimRight	Clean up whitespace characters on right sides of the string
int/integer	Convert value(string/intX/floatX) to int type v.FilterRule("id", "int")
lower/lowercase	Convert string to lowercase
upper/uppercase	Convert string to uppercase
lcFirst/lowerFirst	Convert the first character of a string to lowercase
ucFirst/upperFirst	Convert the first character of a string to uppercase
ucWord/upperWord	Convert the first character of each word to uppercase
camel/camelCase	Convert string to camel naming style
snake/snakeCase	Convert string to snake naming style
escapeJs/escapeJS	Escape JS string.
escapeHtml/escapeHTML	Escape HTML string.
str2ints/strToInts	Convert string to int slice []int
str2time/strToTime	Convert date string to time.Time.
str2arr/str2array/strToArray	Convert string to string slice []string

Gookit packages

• gookit/ini Go config management, use INI files
• gookit/rux Simple and fast request router for golang HTTP
• gookit/gcli build CLI application, tool library, running CLI commands
• gookit/event Lightweight event manager and dispatcher implements by Go
• gookit/cache Generic cache use and cache manager for golang. support File, Memory, Redis, Memcached.
• gookit/config Go config management. support JSON, YAML, TOML, INI, HCL, ENV and Flags
• gookit/color A command-line color library with true color support, universal API methods and Windows support
• gookit/filter Provide filtering, sanitizing, and conversion of golang data
• gookit/validate Use for data validation and filtering. support Map, Struct, Form data
• gookit/goutil Some utils for the Go: string, array/slice, map, format, cli, env, filesystem, test and more
• More please see https://github.com/gookit

See also

• https://github.com/albrow/forms
• https://github.com/asaskevich/govalidator
• https://github.com/go-playground/validator
• https://github.com/inhere/php-validate

License

MIT