validator.js

A library of string validators and sanitizers.

Server-side usage

Install the library with npm install validator

var validator = require('validator');

validator.isEmail('[email protected]'); //=> true

ES6

import validator from 'validator';

Or, import only a subset of the library:

import isEmail from 'validator/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('[email protected]'); //=> true
</script>

The library can also be installed through bower

$ bower install validator-js

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 is an error.

Validators

• contains(str, seed) - check if the string contains the seed.
• equals(str, comparison) - check if the string matches the comparison.
• isAfter(str [, date]) - check if the string is a date that's after the specified date (defaults to now).
• isAlpha(str [, locale]) - 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', 'cs-CZ', 'da-DK', 'de-DE', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'es-ES', 'fr-FR', 'hu-HU', 'nl-NL', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'sr-RS', 'sr-RS@latin', 'tr-TR', 'uk-UA']) and defaults to en-US.
• isAlphanumeric(str [, locale]) - check if the string contains only letters and numbers. 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', 'cs-CZ', 'da-DK', 'de-DE', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NZ', 'en-US', 'en-ZA', 'en-ZM', 'es-ES', 'fr-FR', 'fr-BE', 'hu-HU', 'nl-BE', 'nl-NL', 'pl-PL', 'pt-BR', 'pt-PT', 'ru-RU', 'sr-RS', 'sr-RS@latin', 'tr-TR', 'uk-UA']) and defaults to en-US.
• isAscii(str) - check if the string contains ASCII chars only.
• isBase64(str) - check if a string is base64 encoded.
• isBefore(str [, date]) - check if the string is a date that's before the specified date.
• isBoolean(str) - check if a string is a boolean.
• 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) - check if the string is a credit card.
• 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_space_after_digits: false }.
• isDataURI(str) - check if the string is a data uri format.
• isDecimal(str) - check if the string represents a decimal number, such as 0.1, .3, 1.1, 1.00003, 4.0, etc.
• isDivisibleBy(str, number) - check if the string is a number that's divisible by another.
• 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 }. 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, e-mail addresses without having TLD in their domain will also be matched.
• isEmpty(str) - check if the string has a length of zero.
• 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 }.
• 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 }). min and max are equivalent to 'greater or equal' and 'less or equal', respectively while gt and lt are their strict counterparts.
• isFullWidth(str) - check if the string contains any full-width chars.
• isHalfWidth(str) - check if the string contains any half-width chars.
• isHexColor(str) - check if the string is a hexadecimal color.
• isHexadecimal(str) - check if the string is a hexadecimal number.
• isIP(str [, version]) - check if the string is an IP (version 4 or 6).
• isISBN(str [, version]) - check if the string is an ISBN (version 10 or 13).
• 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.
• isISIN(str) - check if the string is an ISIN (stock/security identifier).
• isISO8601(str) - check if the string is a valid ISO 8601 date.
• isIn(str, values) - check if the string is in a 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).
• isJSON(str) - check if the string is valid JSON (note: uses JSON.parse).
• isLength(str, options) - check if the string's length falls in a range. options is an object which defaults to {min:0, max: undefined}. Note: this function takes into account surrogate pairs.
• isLowercase(str) - check if the string is lowercase.
• isMACAddress(str) - check if the string is a MAC address.
• isMD5(str) - check if the string is a MD5 hash.
• isMobilePhone(str, locale) - check if the string is a mobile phone number, (locale is one of ['ar-DZ', 'ar-SA', 'ar-SY', 'cs-CZ', 'de-DE', 'da-DK', 'el-GR', 'en-AU', 'en-GB', 'en-HK', 'en-IN', 'en-NG', 'en-NZ', 'en-US', 'en-CA', 'en-ZA', 'en-ZM', 'es-ES', 'en-PK', 'fi-FI', 'fr-FR', 'he-IL', 'hu-HU', 'it-IT', 'ja-JP', 'ms-MY', 'nb-NO', 'nn-NO', 'pl-PL', 'pt-PT', 'ro-RO', 'ru-RU', 'sr-RS', 'tr-TR', 'vi-VN', 'zh-CN', 'zh-HK', 'zh-TW']).
• 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) - check if the string contains only numbers.
• isSurrogatePair(str) - check if the string contains any surrogate pairs chars.
• isURL(str [, options]) - check if the string is an URL. options is an object which defaults to { protocols: ['http','https','ftp'], require_tld: true, require_protocol: false, require_host: true, require_valid_protocol: true, allow_underscores: false, host_whitelist: false, host_blacklist: false, allow_trailing_dot: false, allow_protocol_relative_urls: false }.
• isUUID(str [, version]) - check if the string is a UUID (version 3, 4 or 5).
• isUppercase(str) - check if the string is uppercase.
• isVariableWidth(str) - check if the string contains a mixture of full and half-width chars.
• isWhitelisted(str, chars) - checks characters if they appear in the whitelist.
• matches(str, pattern [, modifiers]) - check if string matches the pattern. Either matches('foo', /foo/i) or matches('foo', 'foo', 'i').

Sanitizers

• 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.
• unescape(input) - replaces HTML encoded entities with <, >, &, ', " and /.
• ltrim(input [, chars]) - trim characters from the left-side of the input.
• normalizeEmail(email [, options]) - canonicalizes an email address. 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's 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. "[email protected]" becomes "[email protected]").
  • 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. "[email protected]" becomes "[email protected]").
  • 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. "[email protected]" becomes "[email protected]").
  • 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. "[email protected]" becomes "[email protected]").
• 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.
• 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.

Tests

$ npm test

Reading

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

License (MIT)

Copyright (c) 2017 Chris O'Hara <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.