A comprehensive library of string validators and sanitizers for Node.js and browsers.
validator.js is a JavaScript library that provides a comprehensive suite of functions for validating and sanitizing strings. It helps developers ensure data integrity by checking inputs against common formats like emails, URLs, dates, and custom patterns, and includes utilities to clean and normalize string data. The library is designed to be lightweight, modular, and cross-platform, working in both Node.js and browser environments.
JavaScript developers building web applications, APIs, or forms that require robust input validation and sanitization, especially those needing locale-aware checks or handling diverse data formats.
Developers choose validator.js for its extensive, well-tested validation functions, modular architecture that supports tree-shaking, and zero-dependency design. It offers a reliable, performant alternative to rolling custom validation logic, with strong community maintenance and cross-runtime compatibility.
String validation
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Offers over 100 validation functions for formats like emails, URLs, credit cards, and dates, each with configurable options as detailed in the README tables.
Many validators, such as isAlpha and isPostalCode, support multiple locales for global applications, with explicit locale lists provided in the documentation.
Functions can be imported individually via ES modules (e.g., validator/es/lib/isEmail), enabling reduced bundle sizes through tree-shaking.
Works in Node.js, browsers (via CDN or bundler), and supports both CommonJS and ES modules, as shown in the installation and usage sections.
The library validates only strings, requiring manual coercion (e.g., input + '') for other data types, which is a stated restriction in the README.
XSS sanitization was removed, forcing users to integrate external libraries like DOMPurify, as acknowledged in the sanitizers section with a recommendation to alternatives.
Some validators have verbose options objects (e.g., isCurrency with over a dozen parameters), making setup and maintenance cumbersome for simple use cases.