Validation

simple validation functions

webpack Validation Utils

Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.

Validate identifier/keywords name

Validate plugin/preset options

Wrap zod validation errors in user-friendly readable messages

Json Schema Type Builder with Static Type Resolution for TypeScript

Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.

General purpose validation library for JavaScript

Validates whether a string matches the production for an XML name or qualified name

Regular expression parser for ECMAScript.

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

Get and validate the raw body of a readable stream.

Give me a string and I'll tell you if it's a valid npm package license string

Compile objects with duplicate keys to valid strict ES5

An object schema merger/validator

Parse yes/no like values

Generic configuration validation tool that helps you with warnings, errors and deprecation messages as well as showing users examples of correct configuration.

Validate XML, Parse XML, Build XML without C/C++ based libraries

Utilities for determining if characters belong to character classes defined by the XML specs.

Express middleware to validate request (headers, params, query, body) using Joi

A ridiculously light-weight argument validator (now browser friendly)

Type check values

Check if a protocol requires a certain port number to be added to an URL.

Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.

Returns true if a value has the characteristics of a valid JavaScript data descriptor.

TypeScript-first schema declaration and validation library with static type inference

JSON Schema validation and specifications

Give me a string and I'll tell you if it's a valid npm package name

Error constructor for test and validation frameworks that implements standardized AssertionError specification.

Runtime validation and processing of JavaScript types

A library for parsing IPv4 and IPv6 IP addresses in node and the browser.

String validation and sanitization

A function to check whether a prop is valid for HTML and SVG elements

Runtime library to validate data against TypeScript interfaces

JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes

Extremely fast HTTP Archive (HAR) validator using JSON Schema

Regular expression parser for ECMAScript.

Email address and domain validation

Hash a stream of data, then validate

Lint files staged by git

Object schema validation

Dead simple Object schema validation

TypeScript definitions for validator

An object schema merger/validator

Validate a webpack configuration.

Regular expression for matching IP addresses (IPv4 & IPv6)

Node validation utility functions for Docusaurus packages.

Isomorphic, functional type-checking for Javascript

Performant, flexible and extensible forms library for React Hooks