Validation

simple validation functions

Another JSON Schema Validator

webpack Validation Utils

Wrap zod validation errors in user-friendly readable messages

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

Additional JSON-Schema keywords for Ajv JSON validator

Validate plugin/preset options

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

Get and validate the raw body of a readable stream.

Regular expression parser for ECMAScript.

Json Schema Type Builder with Static Type Resolution for TypeScript

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

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.

Format validation for Ajv v7+

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

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

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

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

An object schema merger/validator

General purpose validation library for JavaScript

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

Parse yes/no like values

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

JSON Schema validation and specifications

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

Parse, validate, manipulate, and display dates

Type check values

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

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

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

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

Regular expression parser for ECMAScript.

An object schema merger/validator

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

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

An internal Lerna tool

Runtime library to validate data against TypeScript interfaces

String validation and sanitization

Runtime validation and processing of JavaScript types

Lint files staged by git

Object schema validation

Performant, flexible and extensible forms library for React Hooks

Hash a stream of data, then validate

Email address and domain validation

Regular expression for matching IP addresses (IPv4 & IPv6)