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validator
Advanced tools
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.
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>')); // '<script>alert("xss")</script>'
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'
Joi is a powerful schema description language and data validator for JavaScript. It allows for a more detailed and structured validation process compared to validator, including the ability to create custom validation schemas.
Yup is a JavaScript schema builder for value parsing and validation. It uses a schema-based approach similar to Joi and can be integrated with form libraries like Formik. It is more focused on object schema validation.
Class-validator works with classes and decorators to validate that the properties of an object conform to specified rules. It is typically used with TypeScript and integrates well with class-based frameworks like TypeORM.
Express-validator is a set of express.js middlewares that wraps validator.js functions. It is specifically designed for use with the Express web application framework and allows for easy integration of validation into the request processing pipeline.
A library of string validators and sanitizers.
Install the library with npm install validator
var validator = require('validator');
validator.isEmail('foo@bar.com'); //=> true
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
matches('foo', /foo/i)
or matches('foo', 'foo', 'i')
.options
is an object which defaults to { protocols: ['http','https','ftp'], require_tld: true, require_protocol: false, allow_underscores: false }
.null
if the input is not a date.NaN
if the input is not a float.NaN
if the input is not an integer.'0'
, 'false'
and ''
returns true
. In strict mode only '1'
and 'true'
return true
.<
, >
, &
and "
with HTML entities.keep_new_lines
is true
, newline characters are preserved (\n
and \r
, hex 0xA
and 0xD
). Unicode-safe in JavaScript.This library validates and sanitizes strings only. All input will be coerced to a string using the following rules
toString
property if available.null
, undefined
or NaN
with an empty string.input + ''
.You can add your own validators using validator.extend(name, fn)
validator.extend('isFinite', function (str) {
return isFinite(str);
});
Note that the first argument will be automatically coerced to a string.
validator.isFinite(12345); // => true
validator.isFinite('foo'); // => false
Version 3 of the library deprecated some functionality
If you're migrating from version 1.x
or 2.x
, check out the migration guide.
make test
- run the test suite.make test V=1
- run the test suite with added verbosity.make test TEST=pattern
- run tests that match a pattern.make coverage
- run a coverage analysis tool.make lint
- run a lint tool.Copyright (c) 2014 Chris O'Hara <cohara87@gmail.com>
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.
FAQs
String validation and sanitization
The npm package validator receives a total of 11,843,842 weekly downloads. As such, validator popularity was classified as popular.
We found that validator demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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