Validation

simple validation functions

Another JSON Schema Validator

Wrap zod validation errors in user-friendly readable messages

webpack Validation Utils

Validate identifier/keywords name

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

Validate plugin/preset options

Json Schema Type Builder with Static Type Resolution for TypeScript

Additional JSON-Schema keywords for Ajv JSON validator

Get and validate the raw body of a readable stream.

Regular expression parser for ECMAScript.

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

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

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

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

Format validation for Ajv v7+

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

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

General purpose validation library for JavaScript

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

An object schema merger/validator

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

Parse yes/no like values

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

Compile objects with duplicate keys to valid strict ES5

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

Type check values

Parse, validate, manipulate, and display dates

JSON Schema validation and specifications

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.

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

An object schema merger/validator

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

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

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

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

Performant, flexible and extensible forms library for React Hooks

Runtime library to validate data against TypeScript interfaces

String validation and sanitization

Extremely fast HTTP Archive (HAR) validator using JSON Schema

Regular expression parser for ECMAScript.

Lint files staged by git

Runtime validation and processing of JavaScript types

Object schema validation

React Hook Form validation resolvers: Yup, Joi, Superstruct, Zod, Vest, Class Validator, io-ts, Nope, computed-types, TypeBox, arktype, Typanion, Effect-TS and VineJS

Hash a stream of data, then validate

Email address and domain validation

Node validation utility functions for Docusaurus packages.