Validation

simple validation functions

Another JSON Schema Validator

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

Additional JSON-Schema keywords for Ajv JSON validator

Validate plugin/preset options

Wrap zod validation errors in user-friendly readable messages

Get and validate the raw body of a readable stream.

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

Json Schema Type Builder with Static Type Resolution for TypeScript

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

An object schema merger/validator

General purpose validation library for JavaScript

Format validation for Ajv v7+

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

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

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

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

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

Compile objects with duplicate keys to valid strict ES5

Parse yes/no like values

Parse, validate, manipulate, and display dates

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.

JSON Schema validation and specifications

Type check values

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

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

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

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

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.

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

String validation and sanitization

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

Regular expression parser for ECMAScript.

Runtime validation and processing of JavaScript types

Extremely fast HTTP Archive (HAR) validator using JSON Schema

Runtime library to validate data against TypeScript interfaces

Hash a stream of data, then validate

Lint files staged by git

Object schema validation

Email address and domain validation

An internal Lerna tool

An object schema merger/validator

Dead simple Object schema validation

Regular expression for matching IP addresses (IPv4 & IPv6)