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validatorjs

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The validatorjs library makes data validation in JavaScript very easy in both the browser and Node.js. This library was inspired by the

Why use validatorjs?

  • Not dependent on any libraries.
  • Works in both the browser and Node.
  • Readable and declarative validation rules.
  • Error messages with multilingual support.
  • AMD/Require.js and CommonJS/Browserify support.

Installation

Grab validatorjs from Bower, NPM, or the /dist directory on Github:

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bower install validatorjs
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npm install validatorjs

Browser

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<script src="validator.js"></script>

Node.js / Browserify

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let Validator = require('validatorjs');

Basic Usage

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let validation = new Validator(data, rules [, customErrorMessages]);

data

rules

customErrorMessages

Example 1 - Passing Validation

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let data = { name: 'John', email: 'johndoe@gmail.com', age: 28 }; let rules = { name: 'required', email: 'required|email', age: 'min:18' }; let validation = new Validator(data, rules); validation.passes(); // true validation.fails(); // false

To apply validation rules to the

Example 2 - Failing Validation

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let validation = new Validator({ name: 'D', email: 'not an email address.com' }, { name: 'size:3', email: 'required|email' }); validation.fails(); // true validation.passes(); // false // Error messages validation.errors.first('email'); // 'The email format is invalid.' validation.errors.get('email'); // returns an array of all email error messages

Nested Rules

Nested objects can also be validated. There are two ways to declare validation rules for nested objects. The first way is to declare the validation rules with a corresponding nested object structure that reflects the data. The second way is to declare validation rules with flattened key names. For example, to validate the following data:

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let data = { name: 'John', bio: { age: 28, education: { primary: 'Elementary School', secondary: 'Secondary School' } } };

We could declare our validation rules as follows:

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let nested = { name: 'required', bio: { age: 'min:18', education: { primary: 'string', secondary: 'string' } } }; // OR let flattened = { 'name': 'required', 'bio.age': 'min:18' 'bio.education.primary': 'string', 'bio.education.secondary': 'string' };

WildCards Rules

WildCards can also be validated.

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let data = { users: [{ name: 'John', bio: { age: 28, education: { primary: 'Elementary School', secondary: 'Secondary School' } } }] };

We could declare our validation rules as follows:

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let rules = { 'users.*.name': 'required', 'users.*.bio.age': 'min:18' 'users.*.bio.education.primary': 'string', 'users.*.bio.education.secondary': 'string' };

Available Rules

Validation rules do not have an implicit 'required'. If a field is

accepted

The field under validation must be yes, on, 1 or true. This is useful for validating "Terms of Service" acceptance.

after:date

The field under validation must be after the given date.

after_or_equal:date

The field unter validation must be after or equal to the given field

alpha

The field under validation must be entirely alphabetic characters.

alpha_dash

The field under validation may have alpha-numeric characters, as well as dashes and underscores.

alpha_num

The field under validation must be entirely alpha-numeric characters.

array

The field under validation must be an array.

before:date

The field under validation must be before the given date.

before_or_equal:date

The field under validation must be before or equal to the given date.

between:min,max

The field under validation must have a size between the given min and max. Strings, numerics, and files are evaluated in the same fashion as the size rule.

boolean

The field under validation must be a boolean value of the formtruefalse01'true''false''0''1'

confirmed

The field under validation must have a matching field of foo_confirmation. For example, if the field under validation is password, a matching password_confirmation field must be present in the input.

date

The field under validation must be a valid date format which is acceptable by Javascript'sDate

digits:value

The field under validation must be numeric and must have an exact length of value.

different:attribute

The given field must be different than the field under validation.

email

The field under validation must be formatted as an e-mail address.

hex

The field under validation should be a hexadecimal format. Useful in combination with other rules, likehex|size:6

in:foo,bar,...

The field under validation must be included in the given list of values. The field can be an array or string.

integer

The field under validation must have an integer value.

max:value

Validate that an attribute is no greater than a given size

Note: Maximum checks are inclusive.

min:value

Validate that an attribute is at least a given size.

Note: Minimum checks are inclusive.

not_in:foo,bar,...

The field under validation must not be included in the given list of values.

numeric

Validate that an attribute is numeric. The string representation of a number will pass.

required

Checks if the length of the String representation of the value is >

required_if:anotherfield,value

The field under validation must be present and not empty if the anotherfield field is equal to any value.

required_unless:anotherfield,value

The field under validation must be present and not empty unless the anotherfield field is equal to any value.

required_with:foo,bar,...

The field under validation must be present and not empty only if any of the other specified fields are present.

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.

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.

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.

same:attribute

The given field must match the field under validation.

size:value

The field under validation must have a size matching the given value. For string data, value corresponds to the number of characters. For numeric data, value corresponds to a given integer value.

string

The field under validation must be a string.

url

Validate that an attribute has a valid URL format

regex:pattern

The field under validation must match the given regular expression.

Noteregex

Example 3 - Regex validation

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let validation = new Validator({ name: 'Doe', salary: '10,000.00', yearOfBirth: '1980' }, { name: 'required|size:3', salary: ['required', 'regex:/^(?!0\\.00)\\d{1,3}(,\\d{3})*(\\.\\d\\d)?$/'], yearOfBirth: ['required', 'regex:/^(19|20)[\\d]{2,2}$/'] }); validation.fails(); // false validation.passes(); // true

Example 4 - Type Checking Validation

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let validation = new Validator({ age: 30, name: '' }, { age: ['required', { 'in': [29, 30] }], name: [{ required_if: ['age', 30] }] }); validation.fails(); // true validation.passes(); // false

Register Custom Validation Rules

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Validator.register(name, callbackFn, errorMessage);

name

callbackFn

errorMessage

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Validator.register('telephone', function(value, requirement, attribute) { // requirement parameter defaults to null return value.match(/^\d{3}-\d{3}-\d{4}$/); }, 'The :attribute phone number is not in the format XXX-XXX-XXXX.');

Asynchronous Validation

Register an asynchronous rule which accepts apasses

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Validator.registerAsync('username_available', function(username, attribute, req, passes) { // do your database/api checks here etc // then call the `passes` method where appropriate: passes(); // if username is available passes(false, 'Username has already been taken.'); // if username is not available });

Then call your validator passing a callback tofailspasses

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let validator = new Validator({ username: 'test123' }, { username: 'required|min:3|username_available' }); validator.passes(function() { // Validation passed }); validator.fails(function() { validator.errors.first('username'); });

Note: if you attempt to callpassesfails

Error Messages

This constructor will automatically generate error messages for validation rules that failed.

If there are errors, the Validator instance will have its

.first(attribute)

returns the first error message for an attribute, false otherwise

.get(attribute)

returns an array of error messages for an attribute, or an empty array if there are no errors

.all()

returns an object containing all error messages for all failing attributes

.has(attribute)

returns true if error messages exist for an attribute, false otherwise

.errorCount

the number of validation errors

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let validation = new Validator(input, rules); validation.errors.first('email'); // returns first error message for email attribute validator.errors.get('email'); // returns an array of error messages for the email attribute

Custom Error Messages

If you need a specific error message and you don't want to override the default one, you can pass an override as the third argument to the Validator object, just like with

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let input = { name: '' }; let rules = { name : 'required' }; let validation = new Validator(input, rules, { required: 'You forgot to give a :attribute' }); validation.errors.first('name'); // returns 'You forgot to give a name'

Some of the validators have string and numeric versions. You can change them too.

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let input = { username: 'myusernameistoolong' }; let rules = { username : 'max:16' }; let validation = new Validator(input, rules, { max: { string: 'The :attribute is too long. Max length is :max.' } }); validation.errors.first('username'); // returns 'The username is too long. Max length is 16.'

You can even provide error messages on a per attribute basis! Just set the message's key to 'validator.attribute'

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let input = { name: '', email: '' }; let rules = { name : 'required', email : 'required' }; let validation = new Validator(input, rules, { "required.email": "Without an :attribute we can't reach you!" }); validation.errors.first('name'); // returns 'The name field is required.' validation.errors.first('email'); // returns 'Without an email we can\'t reach you!'

Custom Attribute Names

To display a custom "friendly" attribute name in error messages, use .setAttributeNames()

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let validator = new Validator({ name: '' }, { name: 'required' }); validator.setAttributeNames({ name: 'custom_name' }); if (validator.fails()) { validator.errors.first('name'); // "The custom_name field is required." }

Alternatively you can supply global custom attribute names in your lang with theattributes

You can also configure a custom attribute formatter:

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// Configure global formatter. Validator.setAttributeFormatter(function(attribute) { return attribute.replace(/_/g, ' '); }); // Or configure formatter for particular instance. let validator = new Validator({ first_name: '' }, { first_name: 'required' }); validator.setAttributeFormatter(function(attribute) { return attribute.replace(/_/g, ' '); }); if (validator.fails()) { console.log(validator.errors.first('first_name')); // The first name field is required. }

Note: by default all _ characters will be replaced with spaces.

Language Support

Error messages are in English by default. To include another language in the browser, reference the language file in a script tag and callValidator.useLang('lang_code')

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<script src="dist/validator.js"></script> <script src="dist/lang/ru.js"></script> <script> Validator.useLang('es'); </script>

In Node, it will automatically pickup on the language source files.

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let Validator = require('validatorjs'); Validator.useLang('ru');

If you don't see support for your language, please add one tosrc/lang

You can also add your own custom language by callingsetMessages

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Validator.setMessages('lang_code', { required: 'The :attribute field is required.' });

Get the raw object of messages for the given language:

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Validator.getMessages('lang_code');

Switch the default language used by the validator:

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Validator.useLang('lang_code');

Get the default language being used:

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Validator.getDefaultLang(); // returns e.g. 'en'

Override default messages for language:

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let messages = Validator.getMessages('en'); messages.required = 'Whoops, :attribute field is required.'; Validator.setMessages('en', messages);