Wrapper for The Nu Html Checker (v.Nu)
Gulp plugin for node-w3c-validator
Online node W3C validator with fallback to offline version
A per-spec XML serializer implementation
Validate html using validator.w3.org/nu og html-validate
Easily validate CSS using W3C's public CSS validator service
Fork of eventsource package - W3C compliant EventSource client for Node.js and browser (polyfill)
Get a KeyboardEvent.key-style string from an event
Validate identifier/keywords name
A tool set for CSS: fast detailed parser (CSS → AST), walker (AST traversal), generator (AST → CSS) and lexer (validation and matching) based on specs and browser implementations
Another JSON Schema Validator
Check the markup validity of HTML files using the W3C validator
Validate plugin/preset options
Additional JSON-Schema keywords for Ajv JSON validator
Color helpers to ease transformation between formats, gamut, etc
[](https://github.com/dutchenkoOleg/node-w3c-validator/blob/master/LICENSE) 
validate form asynchronous
Stylelint plugin to validate CSS syntax
The fastest JS validator library for NodeJS
Decorator-based property validation for classes.
JSON-Schema compatible validator for web3
Another JSON Schema Validator
String validation and sanitization
Core libraries that every NodeJS toolchain project should use