The validator npm package is a library of string validators and sanitizers. It provides a variety of functions to validate and sanitize strings, such as checking if a string is in a certain format (e.g., email, URL) or transforming strings to ensure they are safe for use in different contexts.

What are validator's main functionalities?

Email Validation

Checks if the input string is an email.

const validator = require('validator');
console.log(validator.isEmail('test@example.com')); // true

URL Validation

Checks if the input string is a URL.

const validator = require('validator');
console.log(validator.isURL('https://www.example.com')); // true

Sanitizing Strings

Escapes HTML characters in the input string to prevent XSS attacks.

const validator = require('validator');
console.log(validator.escape('<script>alert("xss")</script>')); // '&lt;script&gt;alert(&quot;xss&quot;)&lt;/script&gt;'

Checking String Length

Checks if the input string's length falls within a specified range.

const validator = require('validator');
console.log(validator.isLength('Hello', {min: 2, max: 10})); // true

Blacklisting Characters

Removes specified characters from the input string.

const validator = require('validator');
console.log(validator.blacklist('abc123', '123')); // 'abc'

Other packages similar to validator

validator.js

A library of string validators and sanitizers.

Strings only

This library validates and sanitizes strings only.

If you're not sure if your input is a string, coerce it using input + ''. Passing anything other than a string will result in an error.

Installation and Usage

Server-side usage

Install the validator package as:

npm i validator
yarn add validator
pnpm i validator

No ES6

var validator = require('validator');

validator.isEmail('foo@bar.com'); //=> true

ES6

import validator from 'validator';

Or, import only a subset of the library:

import isEmail from 'validator/lib/isEmail';

Tree-shakeable ES imports

import isEmail from 'validator/es/lib/isEmail';

Client-side usage

The library can be loaded either as a standalone script, or through an AMD-compatible loader

<script type="text/javascript" src="validator.min.js"></script>
<script type="text/javascript">
  validator.isEmail('foo@bar.com'); //=> true
</script>

The library can also be installed through bower

$ bower install validator-js

CDN

<script src="https://unpkg.com/validator@latest/validator.min.js"></script>

Validators

Here is a list of the validators currently available.

Validator	Description
contains(str, seed [, options])	check if the string contains the seed. `options` is an object that defaults to `{ ignoreCase: false, minOccurrences: 1 }`. Options: `ignoreCase`: Ignore case when doing comparison, default false. `minOccurrences`: Minimum number of occurrences for the seed in the string. Defaults to 1.
equals(str, comparison)	check if the string matches the comparison.
isAbaRouting(str)	check if the string is an ABA routing number for US bank account / cheque.
isAfter(str [, options])	check if the string is a date that is after the specified date. `options` is an object that defaults to `{ comparisonDate: Date().toString() }`. Options: `comparisonDate`: Date to compare to. Defaults to `Date().toString()` (now).
isAlpha(str [, locale, options])	check if the string contains only letters (a-zA-Z). `locale` is one of ['ar', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-LY', 'ar-MA', 'ar-QA', 'ar-QM', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'bg-BG', 'bn', 'cs-CZ', 'da-DK', 'de-DE', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'eo', 'es-ES', 'fa-IR', 'fi-FI', 'fr-CA', 'fr-FR', 'he', 'hi-IN', 'hu-HU', 'it-IT', 'kk-KZ', 'ko-KR', 'ja-JP', 'ku-IQ', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'si-LK', 'sl-SI', 'sk-SK', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'th-TH', 'tr-TR', 'uk-UA'] and defaults to `en-US`. Locale list is `validator.isAlphaLocales`. `options` is an optional object that can be supplied with the following key(s): `ignore` which can either be a String or RegExp of characters to be ignored e.g. " -" will ignore spaces and -'s.
isAlphanumeric(str [, locale, options])	check if the string contains only letters and numbers (a-zA-Z0-9). `locale` is one of ['ar', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-LY', 'ar-MA', 'ar-QA', 'ar-QM', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'bn', 'bg-BG', 'cs-CZ', 'da-DK', 'de-DE', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'eo', 'es-ES', 'fa-IR', 'fi-FI', 'fr-CA', 'fr-FR', 'he', 'hi-IN', 'hu-HU', 'it-IT', 'kk-KZ', 'ko-KR', 'ja-JP','ku-IQ', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'si-LK', 'sl-SI', 'sk-SK', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'th-TH', 'tr-TR', 'uk-UA']) and defaults to `en-US`. Locale list is `validator.isAlphanumericLocales`. `options` is an optional object that can be supplied with the following key(s): `ignore` which can either be a String or RegExp of characters to be ignored e.g. " -" will ignore spaces and -'s.
isAscii(str)	check if the string contains ASCII chars only.
isBase32(str [, options])	check if the string is base32 encoded. `options` is optional and defaults to `{ crockford: false }`. When `crockford` is true it tests the given base32 encoded string using Crockford's base32 alternative.
isBase58(str)	check if the string is base58 encoded.
isBase64(str [, options])	check if the string is base64 encoded. `options` is optional and defaults to `{ urlSafe: false }` when `urlSafe` is true it tests the given base64 encoded string is url safe.
isBefore(str [, date])	check if the string is a date that is before the specified date.
isBIC(str)	check if the string is a BIC (Bank Identification Code) or SWIFT code.
isBoolean(str [, options])	check if the string is a boolean. `options` is an object which defaults to `{ loose: false }`. If `loose` is set to false, the validator will strictly match ['true', 'false', '0', '1']. If `loose` is set to true, the validator will also match 'yes', 'no', and will match a valid boolean string of any case. (e.g.: ['true', 'True', 'TRUE']).
isBtcAddress(str)	check if the string is a valid BTC address.
isByteLength(str [, options])	check if the string's length (in UTF-8 bytes) falls in a range. `options` is an object which defaults to `{ min: 0, max: undefined }`.
isCreditCard(str [, options])	check if the string is a credit card number. `options` is an optional object that can be supplied with the following key(s): `provider` is an optional key whose value should be a string, and defines the company issuing the credit card. Valid values include `['amex', 'dinersclub', 'discover', 'jcb', 'mastercard', 'unionpay', 'visa']` or blank will check for any provider.
isCurrency(str [, options])	check if the string is a valid currency amount. `options` is an object which defaults to `{ symbol: '$', require_symbol: false, allow_space_after_symbol: false, symbol_after_digits: false, allow_negatives: true, parens_for_negatives: false, negative_sign_before_digits: false, negative_sign_after_digits: false, allow_negative_sign_placeholder: false, thousands_separator: ',', decimal_separator: '.', allow_decimal: true, require_decimal: false, digits_after_decimal: [2], allow_space_after_digits: false }`. Note: The array `digits_after_decimal` is filled with the exact number of digits allowed not a range, for example a range 1 to 3 will be given as [1, 2, 3].
isDataURI(str)	check if the string is a data uri format.
isDate(str [, options])	check if the string is a valid date. e.g. [`2002-07-15`, new Date()]. `options` is an object which can contain the keys `format`, `strictMode` and/or `delimiters`. `format` is a string and defaults to `YYYY/MM/DD`. `strictMode` is a boolean and defaults to `false`. If `strictMode` is set to true, the validator will reject strings different from `format`. `delimiters` is an array of allowed date delimiters and defaults to `['/', '-']`.
isDecimal(str [, options])	check if the string represents a decimal number, such as 0.1, .3, 1.1, 1.00003, 4.0, etc. `options` is an object which defaults to `{force_decimal: false, decimal_digits: '1,', locale: 'en-US'}`. `locale` determines the decimal separator and is one of ['ar', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-LY', 'ar-MA', 'ar-QA', 'ar-QM', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'bg-BG', 'cs-CZ', 'da-DK', 'de-DE', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'eo', 'es-ES', 'fa', 'fa-AF', 'fa-IR', 'fr-FR', 'fr-CA', 'hu-HU', 'id-ID', 'it-IT', 'ku-IQ', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pl-Pl', 'pt-BR', 'pt-PT', 'ru-RU', 'sl-SI', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'tr-TR', 'uk-UA', 'vi-VN']. Note: `decimal_digits` is given as a range like '1,3', a specific value like '3' or min like '1,'.
isDivisibleBy(str, number)	check if the string is a number that is divisible by another.
isEAN(str)	check if the string is an EAN (European Article Number).
isEmail(str [, options])	check if the string is an email. `options` is an object which defaults to `{ allow_display_name: false, require_display_name: false, allow_utf8_local_part: true, require_tld: true, allow_ip_domain: false, allow_underscores: false, domain_specific_validation: false, blacklisted_chars: '', host_blacklist: [] }`. If `allow_display_name` is set to true, the validator will also match `Display Name <email-address>`. If `require_display_name` is set to true, the validator will reject strings without the format `Display Name <email-address>`. If `allow_utf8_local_part` is set to false, the validator will not allow any non-English UTF8 character in email address' local part. If `require_tld` is set to false, email addresses without a TLD in their domain will also be matched. If `ignore_max_length` is set to true, the validator will not check for the standard max length of an email. If `allow_ip_domain` is set to true, the validator will allow IP addresses in the host part. If `domain_specific_validation` is true, some additional validation will be enabled, e.g. disallowing certain syntactically valid email addresses that are rejected by Gmail. If `blacklisted_chars` receives a string, then the validator will reject emails that include any of the characters in the string, in the name part. If `host_blacklist` is set to an array of strings or regexp, and the part of the email after the `@` symbol matches one of the strings defined in it, the validation fails. If `host_whitelist` is set to an array of strings or regexp, and the part of the email after the `@` symbol matches none of the strings defined in it, the validation fails.
isEmpty(str [, options])	check if the string has a length of zero. `options` is an object which defaults to `{ ignore_whitespace: false }`.
isEthereumAddress(str)	check if the string is an Ethereum address. Does not validate address checksums.
isFloat(str [, options])	check if the string is a float. `options` is an object which can contain the keys `min`, `max`, `gt`, and/or `lt` to validate the float is within boundaries (e.g. `{ min: 7.22, max: 9.55 }`) it also has `locale` as an option. `min` and `max` are equivalent to 'greater or equal' and 'less or equal', respectively while `gt` and `lt` are their strict counterparts. `locale` determines the decimal separator and is one of `['ar', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-LY', 'ar-MA', 'ar-QA', 'ar-QM', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'bg-BG', 'cs-CZ', 'da-DK', 'de-DE', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'eo', 'es-ES', 'fr-CA', 'fr-FR', 'hu-HU', 'it-IT', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'sl-SI', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'tr-TR', 'uk-UA']`. Locale list is `validator.isFloatLocales`.
isFQDN(str [, options])	check if the string is a fully qualified domain name (e.g. domain.com). `options` is an object which defaults to `{ require_tld: true, allow_underscores: false, allow_trailing_dot: false, allow_numeric_tld: false, allow_wildcard: false, ignore_max_length: false }`. If `allow_wildcard` is set to true, the validator will allow domain starting with `.` (e.g. `.example.com` or `*.shop.example.com`).
isFreightContainerID(str)	alias for `isISO6346`, check if the string is a valid ISO 6346 shipping container identification.
isFullWidth(str)	check if the string contains any full-width chars.
isHalfWidth(str)	check if the string contains any half-width chars.
isHash(str, algorithm)	check if the string is a hash of type algorithm. Algorithm is one of `['crc32', 'crc32b', 'md4', 'md5', 'ripemd128', 'ripemd160', 'sha1', 'sha256', 'sha384', 'sha512', 'tiger128', 'tiger160', 'tiger192']`.
isHexadecimal(str)	check if the string is a hexadecimal number.
isHexColor(str)	check if the string is a hexadecimal color.
isHSL(str)	check if the string is an HSL (hue, saturation, lightness, optional alpha) color based on CSS Colors Level 4 specification. Comma-separated format supported. Space-separated format supported with the exception of a few edge cases (ex: `hsl(200grad+.1%62%/1)`).
isIBAN(str, [, options])	check if the string is an IBAN (International Bank Account Number). `options` is an object which accepts two attributes: `whitelist`: where you can restrict IBAN codes you want to receive data from and `blacklist`: where you can remove some of the countries from the current list. For both you can use an array with the following values `['AD','AE','AL','AT','AZ','BA','BE','BG','BH','BR','BY','CH','CR','CY','CZ','DE','DK','DO','EE','EG','ES','FI','FO','FR','GB','GE','GI','GL','GR','GT','HR','HU','IE','IL','IQ','IR','IS','IT','JO','KW','KZ','LB','LC','LI','LT','LU','LV','MC','MD','ME','MK','MR','MT','MU','MZ','NL','NO','PK','PL','PS','PT','QA','RO','RS','SA','SC','SE','SI','SK','SM','SV','TL','TN','TR','UA','VA','VG','XK']`.
isIdentityCard(str [, locale])	check if the string is a valid identity card code. `locale` is one of `['LK', 'PL', 'ES', 'FI', 'IN', 'IT', 'IR', 'MZ', 'NO', 'TH', 'zh-TW', 'he-IL', 'ar-LY', 'ar-TN', 'zh-CN', 'zh-HK', 'PK']` OR `'any'`. If 'any' is used, function will check if any of the locales match. Defaults to 'any'.
isIMEI(str [, options]))	check if the string is a valid IMEI number. IMEI should be of format `###############` or `##-######-######-#`. `options` is an object which can contain the keys `allow_hyphens`. Defaults to first format. If `allow_hyphens` is set to true, the validator will validate the second format.
isIn(str, values)	check if the string is in an array of allowed values.
isInt(str [, options])	check if the string is an integer. `options` is an object which can contain the keys `min` and/or `max` to check the integer is within boundaries (e.g. `{ min: 10, max: 99 }`). `options` can also contain the key `allow_leading_zeroes`, which when set to false will disallow integer values with leading zeroes (e.g. `{ allow_leading_zeroes: false }`). Finally, `options` can contain the keys `gt` and/or `lt` which will enforce integers being greater than or less than, respectively, the value provided (e.g. `{gt: 1, lt: 4}` for a number between 1 and 4).
isIP(str [, version])	check if the string is an IP (version 4 or 6).
isIPRange(str [, version])	check if the string is an IP Range (version 4 or 6).
isISBN(str [, options])	check if the string is an ISBN. `options` is an object that has no default. Options: `version`: ISBN version to compare to. Accepted values are '10' and '13'. If none provided, both will be tested.
isISIN(str)	check if the string is an ISIN (stock/security identifier).
isISO6346(str)	check if the string is a valid ISO 6346 shipping container identification.
isISO6391(str)	check if the string is a valid ISO 639-1 language code.
isISO8601(str [, options])	check if the string is a valid ISO 8601 date. `options` is an object which defaults to `{ strict: false, strictSeparator: false }`. If `strict` is true, date strings with invalid dates like `2009-02-29` will be invalid. If `strictSeparator` is true, date strings with date and time separated by anything other than a T will be invalid.
isISO15924(str)	check if the string is a valid ISO 15924 officially assigned script code.
isISO31661Alpha2(str)	check if the string is a valid ISO 3166-1 alpha-2 officially assigned country code.
isISO31661Alpha3(str)	check if the string is a valid ISO 3166-1 alpha-3 officially assigned country code.
isISO31661Numeric(str)	check if the string is a valid ISO 3166-1 numeric officially assigned country code.
isISO4217(str)	check if the string is a valid ISO 4217 officially assigned currency code.
isISRC(str)	check if the string is an ISRC.
isISSN(str [, options])	check if the string is an ISSN. `options` is an object which defaults to `{ case_sensitive: false, require_hyphen: false }`. If `case_sensitive` is true, ISSNs with a lowercase `'x'` as the check digit are rejected.
isJSON(str [, options])	check if the string is valid JSON (note: uses JSON.parse). `options` is an object which defaults to `{ allow_primitives: false }`. If `allow_primitives` is true, the primitives 'true', 'false' and 'null' are accepted as valid JSON values.
isJWT(str)	check if the string is valid JWT token.
isLatLong(str [, options])	check if the string is a valid latitude-longitude coordinate in the format `lat,long` or `lat, long`. `options` is an object that defaults to `{ checkDMS: false }`. Pass `checkDMS` as `true` to validate DMS(degrees, minutes, and seconds) latitude-longitude format.
isLength(str [, options])	check if the string's length falls in a range and equal to any of the integers of the `discreteLengths` array if provided. `options` is an object which defaults to `{ min: 0, max: undefined, discreteLengths: undefined }`. Note: this function takes into account surrogate pairs.
isLicensePlate(str, locale)	check if the string matches the format of a country's license plate. `locale` is one of `['cs-CZ', 'de-DE', 'de-LI', 'en-IN', 'en-SG', 'en-PK', 'es-AR', 'hu-HU', 'pt-BR', 'pt-PT', 'sq-AL', 'sv-SE']` or `'any'`.
isLocale(str)	check if the string is a locale.
isLowercase(str)	check if the string is lowercase.
isLuhnNumber(str)	check if the string passes the Luhn algorithm check.
isMACAddress(str [, options])	check if the string is a MAC address. `options` is an object which defaults to `{ no_separators: false }`. If `no_separators` is true, the validator will allow MAC addresses without separators. Also, it allows the use of hyphens, spaces or dots e.g. '01 02 03 04 05 ab', '01-02-03-04-05-ab' or '0102.0304.05ab'. The options also allow a `eui` property to specify if it needs to be validated against EUI-48 or EUI-64. The accepted values of `eui` are: 48, 64.
isMagnetURI(str)	check if the string is a Magnet URI format.
isMailtoURI(str, [, options])	check if the string is a Mailto URI format. `options` is an object of validating emails inside the URI (check `isEmail`s options for details).
isMD5(str)	check if the string is a MD5 hash. Please note that you can also use the `isHash(str, 'md5')` function. Keep in mind that MD5 has some collision weaknesses compared to other algorithms (e.g., SHA).
isMimeType(str)	check if the string matches to a valid MIME type format.
isMobilePhone(str [, locale [, options]])	check if the string is a mobile phone number, `locale` is either an array of locales (e.g. `['sk-SK', 'sr-RS']`) OR one of ['am-Am', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-EH', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-PS', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'az-AZ', 'az-LB', 'az-LY', 'be-BY', 'bg-BG', 'bn-BD', 'bs-BA', 'ca-AD', 'cs-CZ', 'da-DK', 'de-AT', 'de-CH', 'de-DE', 'de-LU', 'dv-MV', 'dz-BT', 'el-CY', 'el-GR', 'en-AG', 'en-AI', 'en-AU', 'en-BM', 'en-BS', 'en-BW', 'en-CA', 'en-GB', 'en-GG', 'en-GH', 'en-GY', 'en-HK', 'en-IE', 'en-IN', 'en-JM', 'en-KE', 'en-KI', 'en-KN', 'en-LS', 'en-MO', 'en-MT', 'en-MU', 'en-MW', 'en-NG', 'en-NZ', 'en-PG', 'en-PH', 'en-PK', 'en-RW', 'en-SG', 'en-SL', 'en-SS', 'en-TZ', 'en-UG', 'en-US', 'en-ZA', 'en-ZM', 'en-ZW', 'es-AR', 'es-BO', 'es-CL', 'es-CO', 'es-CR', 'es-CU', 'es-DO', 'es-EC', 'es-ES', 'es-GT','es-HN', 'es-MX', 'es-NI', 'es-PA', 'es-PE', 'es-PY', 'es-SV', 'es-UY', 'es-VE', 'et-EE', 'fa-AF', 'fa-IR', 'fi-FI', 'fj-FJ', 'fo-FO', 'fr-BE', 'fr-BF', 'fr-BJ', 'fr-CD', 'fr-CF', 'fr-FR', 'fr-GF', 'fr-GP', 'fr-MQ', 'fr-PF', 'fr-RE', 'fr-WF', 'ga-IE', 'he-IL', 'hu-HU', 'id-ID', 'ir-IR', 'it-IT', 'it-SM', 'ja-JP', 'ka-GE', 'kk-KZ', 'kl-GL', 'ko-KR', 'ky-KG', 'lt-LT', 'mg-MG', 'mn-MN', 'mk-MK', 'ms-MY', 'my-MM', 'mz-MZ', 'nb-NO', 'ne-NP', 'nl-AW', 'nl-BE', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-AO', 'pt-BR', 'pt-PT', 'ro-Md', 'ro-RO', 'ru-RU', 'si-LK', 'sk-SK', 'sl-SI', 'so-SO', 'sq-AL', 'sr-RS', 'sv-SE', 'tg-TJ', 'th-TH', 'tk-TM', 'tr-TR', 'uk-UA', 'uz-UZ', 'vi-VN', 'zh-CN', 'zh-HK', 'zh-MO', 'zh-TW'] OR defaults to `'any'`. If 'any' or a falsey value is used, function will check if any of the locales match). `options` is an optional object that can be supplied with the following keys: `strictMode`, if this is set to `true`, the mobile phone number must be supplied with the country code and therefore must start with `+`. Locale list is `validator.isMobilePhoneLocales`.
isMongoId(str)	check if the string is a valid hex-encoded representation of a MongoDB ObjectId.
isMultibyte(str)	check if the string contains one or more multibyte chars.
isNumeric(str [, options])	check if the string contains only numbers. `options` is an object which defaults to `{ no_symbols: false }` it also has `locale` as an option. If `no_symbols` is true, the validator will reject numeric strings that feature a symbol (e.g. `+`, `-`, or `.`). `locale` determines the decimal separator and is one of `['ar', 'ar-AE', 'ar-BH', 'ar-DZ', 'ar-EG', 'ar-IQ', 'ar-JO', 'ar-KW', 'ar-LB', 'ar-LY', 'ar-MA', 'ar-QA', 'ar-QM', 'ar-SA', 'ar-SD', 'ar-SY', 'ar-TN', 'ar-YE', 'bg-BG', 'cs-CZ', 'da-DK', 'de-DE', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'eo', 'es-ES', 'fr-FR', 'fr-CA', 'hu-HU', 'it-IT', 'nb-NO', 'nl-NL', 'nn-NO', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'sl-SI', 'sr-RS', 'sr-RS@latin', 'sv-SE', 'tr-TR', 'uk-UA']`.
isOctal(str)	check if the string is a valid octal number.
isPassportNumber(str, countryCode)	check if the string is a valid passport number. `countryCode` is one of `['AM', 'AR', 'AT', 'AU', 'AZ', 'BE', 'BG', 'BY', 'BR', 'CA', 'CH', 'CN', 'CY', 'CZ', 'DE', 'DK', 'DZ', 'EE', 'ES', 'FI', 'FR', 'GB', 'GR', 'HR', 'HU', 'IE', 'IN', 'IR', 'ID', 'IS', 'IT', 'JM', 'JP', 'KR', 'KZ', 'LI', 'LT', 'LU', 'LV', 'LY', 'MT', 'MX', 'MY', 'MZ', 'NL', 'NZ', 'PH', 'PK', 'PL', 'PT', 'RO', 'RU', 'SE', 'SL', 'SK', 'TH', 'TR', 'UA', 'US', 'ZA']`. Locale list is `validator.passportNumberLocales`.
isPort(str)	check if the string is a valid port number.
isPostalCode(str, locale)	check if the string is a postal code. `locale` is one of `['AD', 'AT', 'AU', 'AZ', 'BA', 'BE', 'BG', 'BR', 'BY', 'CA', 'CH', 'CN', 'CO', 'CZ', 'DE', 'DK', 'DO', 'DZ', 'EE', 'ES', 'FI', 'FR', 'GB', 'GR', 'HR', 'HT', 'HU', 'ID', 'IE', 'IL', 'IN', 'IR', 'IS', 'IT', 'JP', 'KE', 'KR', 'LI', 'LK', 'LT', 'LU', 'LV', 'MG', 'MT', 'MX', 'MY', 'NL', 'NO', 'NP', 'NZ', 'PL', 'PR', 'PT', 'RO', 'RU', 'SA', 'SE', 'SG', 'SI', 'SK', 'TH', 'TN', 'TW', 'UA', 'US', 'ZA', 'ZM']` OR `'any'`. If 'any' is used, function will check if any of the locales match. Locale list is `validator.isPostalCodeLocales`.
isRFC3339(str)	check if the string is a valid RFC 3339 date.
isRgbColor(str [,options])	check if the string is a rgb or rgba color. `options` is an object with the following properties `includePercentValues` defaults to `true`. If you don't want to allow to set `rgb` or `rgba` values with percents, like `rgb(5%,5%,5%)`, or `rgba(90%,90%,90%,.3)`, then set it to false. `allowSpaces` defaults to `true`, which prohibits whitespace. If set to false, whitespace between color values is allowed, such as `rgb(255, 255, 255)` or even `rgba(255, 128, 0, 0.7)`.
isSemVer(str)	check if the string is a Semantic Versioning Specification (SemVer).
isSurrogatePair(str)	check if the string contains any surrogate pairs chars.
isUppercase(str)	check if the string is uppercase.
isSlug(str)	check if the string is of type slug.
isStrongPassword(str [, options])	check if the string can be considered a strong password or not. Allows for custom requirements or scoring rules. If `returnScore` is true, then the function returns an integer score for the password rather than a boolean. Default options: `{ minLength: 8, minLowercase: 1, minUppercase: 1, minNumbers: 1, minSymbols: 1, returnScore: false, pointsPerUnique: 1, pointsPerRepeat: 0.5, pointsForContainingLower: 10, pointsForContainingUpper: 10, pointsForContainingNumber: 10, pointsForContainingSymbol: 10 }`
isTime(str [, options])	check if the string is a valid time e.g. [`23:01:59`, new Date().toLocaleTimeString()]. `options` is an object which can contain the keys `hourFormat` or `mode`. `hourFormat` is a key and defaults to `'hour24'`. `mode` is a key and defaults to `'default'`. `hourFormat` can contain the values `'hour12'` or `'hour24'`, `'hour24'` will validate hours in 24 format and `'hour12'` will validate hours in 12 format. `mode` can contain the values `'default'` or `'withSeconds'`, `'default'` will validate `HH:MM` format, `'withSeconds'` will validate the `HH:MM:SS` format.
isTaxID(str, locale)	check if the string is a valid Tax Identification Number. Default locale is `en-US`. More info about exact TIN support can be found in `src/lib/isTaxID.js`. Supported locales: `[ 'bg-BG', 'cs-CZ', 'de-AT', 'de-DE', 'dk-DK', 'el-CY', 'el-GR', 'en-CA', 'en-GB', 'en-IE', 'en-US', 'es-AR', 'es-ES', 'et-EE', 'fi-FI', 'fr-BE', 'fr-CA', 'fr-FR', 'fr-LU', 'hr-HR', 'hu-HU', 'it-IT', 'lb-LU', 'lt-LT', 'lv-LV', 'mt-MT', 'nl-BE', 'nl-NL', 'pl-PL', 'pt-BR', 'pt-PT', 'ro-RO', 'sk-SK', 'sl-SI', 'sv-SE', 'uk-UA']`.
isURL(str [, options])	check if the string is a URL. `options` is an object which defaults to `{ protocols: ['http','https','ftp'], require_tld: true, require_protocol: false, require_host: true, require_port: false, require_valid_protocol: true, allow_underscores: false, host_whitelist: false, host_blacklist: false, allow_trailing_dot: false, allow_protocol_relative_urls: false, allow_fragments: true, allow_query_components: true, disallow_auth: false, validate_length: true }`. `require_protocol` - if set to true isURL will return false if protocol is not present in the URL. `require_valid_protocol` - isURL will check if the URL's protocol is present in the protocols option. `protocols` - valid protocols can be modified with this option. `require_host` - if set to false isURL will not check if host is present in the URL. `require_port` - if set to true isURL will check if port is present in the URL. `allow_protocol_relative_urls` - if set to true protocol relative URLs will be allowed. `allow_fragments` - if set to false isURL will return false if fragments are present. `allow_query_components` - if set to false isURL will return false if query components are present. `validate_length` - if set to false isURL will skip string length validation. `max_allowed_length` will be ignored if this is set as `false`. `max_allowed_length` - if set isURL will not allow URLs longer than the specified value (default is 2084 that IE maximum URL length).
isULID(str)	check if the string is a ULID.
isUUID(str [, version])	check if the string is an RFC9562 UUID. `version` is one of `'1'`-`'8'`, `'nil'`, `'max'`, or `'all'`.
isVariableWidth(str)	check if the string contains a mixture of full and half-width chars.
isVAT(str, countryCode)	check if the string is a valid VAT number if validation is available for the given country code matching ISO 3166-1 alpha-2. `countryCode` is one of `['AL', 'AR', 'AT', 'AU', 'BE', 'BG', 'BO', 'BR', 'BY', 'CA', 'CH', 'CL', 'CO', 'CR', 'CY', 'CZ', 'DE', 'DK', 'DO', 'EC', 'EE', 'EL', 'ES', 'FI', 'FR', 'GB', 'GT', 'HN', 'HR', 'HU', 'ID', 'IE', 'IL', 'IN', 'IS', 'IT', 'KZ', 'LT', 'LU', 'LV', 'MK', 'MT', 'MX', 'NG', 'NI', 'NL', 'NO', 'NZ', 'PA', 'PE', 'PH', 'PL', 'PT', 'PY', 'RO', 'RS', 'RU', 'SA', 'SE', 'SI', 'SK', 'SM', 'SV', 'TR', 'UA', 'UY', 'UZ', 'VE']`.
isWhitelisted(str, chars)	check if the string consists only of characters that appear in the whitelist `chars`.
matches(str, pattern [, modifiers])	check if the string matches the pattern. Either `matches('foo', /foo/i)` or `matches('foo', 'foo', 'i')`.

Sanitizers

Here is a list of the sanitizers currently available.

Sanitizer	Description
blacklist(input, chars)	remove characters that appear in the blacklist. The characters are used in a RegExp and so you will need to escape some chars, e.g. `blacklist(input, '\\[\\]')`.
escape(input)	replace `<`, `>`, `&`, `'`, `"`, `, `\` and `/` with HTML entities.
ltrim(input [, chars])	trim characters from the left-side of the input.
normalizeEmail(email [, options])	canonicalize an email address. (This doesn't validate that the input is an email, if you want to validate the email use isEmail beforehand). `options` is an object with the following keys and default values: all_lowercase: true - Transforms the local part (before the @ symbol) of all email addresses to lowercase. Please note that this may violate RFC 5321, which gives providers the possibility to treat the local part of email addresses in a case sensitive way (although in practice most - yet not all - providers don't). The domain part of the email address is always lowercased, as it is case insensitive per RFC 1035. gmail_lowercase: true - Gmail addresses are known to be case-insensitive, so this switch allows lowercasing them even when all_lowercase is set to false. Please note that when all_lowercase is true, Gmail addresses are lowercased regardless of the value of this setting. gmail_remove_dots: true: Removes dots from the local part of the email address, as Gmail ignores them (e.g. "john.doe" and "johndoe" are considered equal). gmail_remove_subaddress: true: Normalizes addresses by removing "sub-addresses", which is the part following a "+" sign (e.g. "foo+bar@gmail.com" becomes "foo@gmail.com"). gmail_convert_googlemaildotcom: true: Converts addresses with domain @googlemail.com to @gmail.com, as they're equivalent. outlookdotcom_lowercase: true - Outlook.com addresses (including Windows Live and Hotmail) are known to be case-insensitive, so this switch allows lowercasing them even when all_lowercase is set to false. Please note that when all_lowercase is true, Outlook.com addresses are lowercased regardless of the value of this setting. outlookdotcom_remove_subaddress: true: Normalizes addresses by removing "sub-addresses", which is the part following a "+" sign (e.g. "foo+bar@outlook.com" becomes "foo@outlook.com"). yahoo_lowercase: true - Yahoo Mail addresses are known to be case-insensitive, so this switch allows lowercasing them even when all_lowercase is set to false. Please note that when all_lowercase is true, Yahoo Mail addresses are lowercased regardless of the value of this setting. yahoo_remove_subaddress: true: Normalizes addresses by removing "sub-addresses", which is the part following a "-" sign (e.g. "foo-bar@yahoo.com" becomes "foo@yahoo.com"). icloud_lowercase: true - iCloud addresses (including MobileMe) are known to be case-insensitive, so this switch allows lowercasing them even when all_lowercase is set to false. Please note that when all_lowercase is true, iCloud addresses are lowercased regardless of the value of this setting. icloud_remove_subaddress: true: Normalizes addresses by removing "sub-addresses", which is the part following a "+" sign (e.g. "foo+bar@icloud.com" becomes "foo@icloud.com").
rtrim(input [, chars])	trim characters from the right-side of the input.
stripLow(input [, keep_new_lines])	remove characters with a numerical value < 32 and 127, mostly control characters. If `keep_new_lines` is `true`, newline characters are preserved (`\n` and `\r`, hex `0xA` and `0xD`). Unicode-safe in JavaScript.
toBoolean(input [, strict])	convert the input string to a boolean. Everything except for `'0'`, `'false'` and `''` returns `true`. In strict mode only `'1'` and `'true'` return `true`.
toDate(input)	convert the input string to a date, or `null` if the input is not a date.
toFloat(input)	convert the input string to a float, or `NaN` if the input is not a float.
toInt(input [, radix])	convert the input string to an integer, or `NaN` if the input is not an integer.
trim(input [, chars])	trim characters (whitespace by default) from both sides of the input.
unescape(input)	replace HTML encoded entities with `<`, `>`, `&`, `'`, `"`, `, `\` and `/`.
whitelist(input, chars)	remove characters that do not appear in the whitelist. The characters are used in a RegExp and so you will need to escape some chars, e.g. `whitelist(input, '\\[\\]')`.

XSS Sanitization

XSS sanitization was removed from the library in 2d5d6999.

For an alternative, have a look at Yahoo's xss-filters library or at DOMPurify.

Maintainers

chriso - Chris O'Hara (author)
profnandaa - Anthony Nandaa
rubiin - Rubin Bhandari
wikirik - Rik Smale
ezkemboi - Ezrqn Kemboi
tux-tn - Sarhan Aissi

Reading

Remember, validating can be troublesome sometimes. See A list of articles about programming assumptions commonly made that aren't true.

Contributing

We welcome contributions from the community! If you're interested in contributing to this project, please read our Contribution Guide to get started.

License

This project is licensed under the MIT. See the LICENSE file for details.

Keywords

FAQs

What is validator?

Is validator popular?

Is validator well maintained?

Package last updated on 24 Mar 2025

Did you know?

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install