JSPM

Validates password according to flexible and intuitive specifications

Check if a Node.js Buffer or Uint8Array is UTF-8

Check if a Buffer/Uint8Array is a BZIP2 file

ESLint shareable config for React to be used with eslint-config-xo

Test if a finite numeric value is an odd number.

Checks for URLs during typing and pasting and automatically converts them to links.

Check if a string is a valid filename

allows easy type enforcement for all JS types objects and classes. it is also extensible and provides simple to use type checks for your own custom classes and types

Check the validity of the format of an EU VAT number

Keep your library size in check

Context menu for your Electron app

Check if an object is an array or a typed array

Aids humans and automation in managing npm audit results

A collection of functions for working with different casings.

Test if a finite double-precision floating-point number is an integer.

is-iojs determines if runtime is io.js.

Returns true if an object has an own, nested property using dot notation paths ('a.b.c').

Check if the machine is running Windows or not.

Validate hostname based on RFC-1123

Check whether a binary version satisfies a semver range

Check if the package is being installed by another package

Test if a double-precision floating-point numeric value is positive zero.

TypeScript Standard Style based on StandardJS

Returns `true` if a value exists in the given string, array or object.

Test if a value is NaN.

Test if a value is a number having an integer value.

Check if the process is running as administrator on Windows

Hunspell compatible spell checker

Detect the appearance of an element in the browser DOM

Check if a value is undefined or not.

Test if a value is a number having a nonnegative integer value.

$(document).ready() for the 21st century

Test if a value is a Uint8ClampedArray.

Test if a value is an Int16Array.

Test if a value is an Int32Array.

Async npm module for Node JS that reads the first line of a file

Checks that given package is installed globally or locally.

Test if an object's own property is enumerable.

TypeScript / JavaScript library for detect WebAssembly features in node.js & browser

Test if a finite numeric value is an even number.

Returns true if the current node version matches the given semver expression

Assert a given object is a valid glob option

Test if a value is a collection.

Test if a value is an Int8Array.

Check if the process is running with elevated privileges

Check if the user is running the latest version of the app

Markdown TaskList components

Test if a value is an arguments object.

ESlint plugin to define custom module dependency rules.

Test if a double-precision floating-point numeric value is negative zero.

A pure css library to beautify checkbox and radio buttons.

A command line utility to read version from package.json and attach it into your module as a property

All the goodness of `feross/standard` with semicolons sprinkled on top.

Create an error from the result of validate-glob-opts

Validate glob options

code > prettier > stylelint > formatted code

Check if a file path is an image

Fully customizable animated bouncy checkbox for React Native

Standard assertion utilities.

A tool to enable the checking, inserting and removal of licenses

Checks if an input string is a capitalized or not.

Skema provides a handy & composable way to validate / transform / purify the input data.

Get or set a deep value using a keypath string. Supports bracket and dot notation

Test if a value is an Error object.

allows easy type enforcement for all JS types objects and classes. it is also extensible and provides simple to use type checks for your own custom classes and types

Base58Check encoding

Test whether a value has in its prototype chain a specified constructor as a prototype property.

Compile TypeScript interfaces into a description that allows runtime validation

Test if a value is a number having a positive integer value.

Run your TypeScript type tests using Jest

Minimal JavaScript type checking library

Test if a value is an ArrayBuffer.

check if an AST node is a call to require()

Test if a value is a complex number-like object.

Checks if the given value is an array or array-like object.

Set of various predicates for type checking, assertions, filtering etc

A gulp plugin to lint code with ESLint 8 and 9.

Get or check the current macOS version

Easily expose your http server's health.

Check if something is a Node.js stream. This is a fork of sindresorhus/is-stream, but with CommonJS support.

Test if a value is an array-like object.

Check if something is a positive number

Assertions and Validations for TypeScript

Shallow equal check object.

Test if a value is a number having a positive value.

Test if a value is array-like.

Determines whether a string ends with the characters of another string.

Run elm-review from Node.js

check if an AST node is a call to require()

Lint CSS for email support against caniemail database.

Upcast is a low-level JavaScript type checking and casting library

Test if a value is a Complex64Array.

Type check values: `is.string('🦄') //=> true`

Check types

Check whether a file can be executed

Test if a value is a typed array.

Check if a String/Buffer is TTF

Test if a value is a complex typed array.

Test if a value is a Complex128Array.

[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]

Check if a file is a directory

Check if a number is in a given range

Test if an array-like object supports the accessor (get/set) protocol.

Check if a file path is a video file

Check if an Array is sorted

Check that all files match prettier code style.

Test if a value is an array-like object of numbers.

Utilities for formatting and linting a Dockerfile.

ESLint sharable config for strict linting

Test whether a module is available as a dependency

Utility to check if internet is connected or not

A light-weight jQuery "dirty forms" Plugin - it monitors HTML forms and alerts users to unsaved changes if they attempt to close the browser or navigate away from the page. (Are you sure?)

Check if a JavaScript environment has a DOM

Test if a finite double-precision floating-point number is a nonnegative integer.

Check if a String/Buffer/ArrayBuffer is OTF

Tiny, streaming, seedable CRC32 library, compatible with the crypto.Hash API

Type checking for .eslintrc.json

Return a function which tests if every element in an array-like object passes a test condition.

Returns true if an array has duplicate elements or a string has duplicate characters.

Returns true if a value is the global or window object.

Check the validity of the format of an EU VAT number

Test if a value is typed-array-like.

Validates if a value is a JavaScript object.

Build a navigation structure programatically

Check if something is a negative number

Determine if a variable or expression is a React element or component

If X, return Y, else throw Z.

Checkbox component for react native, it works on iOS and Android.

Library to check variable type and properties in object.

Convert Ethereum address to a checksummed address

Check if a string can be used as a JavaScript variable name

Check if NPM package names conflict

Build templates for initial values

Check that given value is valid hex color, using `hex-color-regex` - the best regex for matching hex color values

check if urls are dead or alive

Check to see if a token is expired using only the token itself without a secret key or validation

Test if a finite double-precision floating-point number is a negative integer.

[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![dependency status][deps-svg]][deps-url] [![dev dependency status][dev-deps-svg]][dev-deps-url] [![License][license-image]][license-url] [![Downloads][downloads-im

Validate the name of a custom element

Check if an email domain belongs to an educational instutition

Check if an environment is little endian.

Validates if a value is undefined.

A simple function for interrupting program flow if a condition isn’t met.

Run commands if on specified node version.

Delete files and folders and any intermediate directories if they exist (sync and async).

Verifies email domains

Checks the integrity of an Endo bundle.

Test if a value is a probability.

Test if an array-like value contains a search value.

The hasNestedProperty method missing in Object. This module does not extend Object.

Tiny module for checking if Promise is globally available

Check your Vue project for unused Components

Check if an object is empty or not.

Create JSON Schema validator from TypeScript.

Check if a string or buffer ends with a given string

Robustly checks an array of URLs for liveness.

Check a character if it is a correctly supported emoji.

🔌 CLI to check/generate .env files and maintain them synchronized

Check if a buffer/Uint8Array is a woff2 file

Check if a Buffer/Uint8Array is EOT

Check if two numbers are equal within a given tolerance

Check if a Buffer/Uint8Array is WOFF

Noir ESLint shareable config

Check if node_modules match package.json versions. npm / yarn install shortcut.

Test if a finite double-precision floating-point number is a positive integer.

Check if a Buffer/Uint8Array is a FLAC file.

Checks if the given value is a valid array-like index.

Returns `true` if text is upper case only.

Check if an URL is a valid HTTP URL.

Check whether a string is a valid HTTP URL

Utility for linting a docker file against accepted good practices

Test if a double-precision floating-point number is a probability.

## Overview

Check if a file exists without try catch

Returns `true` if text is lower case only

Verifies that typescript examples in markdown files actually compile.

Check if a Buffer/Uint8Array is a m4a file.

Check if a Buffer/Uint8Array is a wav file.

Test if a value is an array-like object containing only nonnegative integers.

Detect file type by signature

check RegExp ( regular expressions ) support

Simple, lightweight at-runtime type checking functions, with full TypeScript support

regexp-helper

Check for outdated, incorrect, and unused dependencies.

Check if a Buffer/Uint8Array is an OGG file.

Check if a Buffer/Uint8Array is a MP3 file.

Report tests failures from Jest in GitHub

Test if a value is an array of strings.

Type check values. This is a fork of sindresorhus/is, but with CommonJS support.

Test if a value is a number having a nonnegative value.

JavaScript Standard Style JSDoc support - ESLint Shareable Config

Check if an Iterable is empty

regexp-helper-core

Check if a URL exists.

ESLint shareable config for the HTML Academy style

Checks if a newer version is available for command line interfaces

Test if a value is an array of probabilities that sum to one.

[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![dependency status][deps-svg]][deps-url] [![dev dependency status][dev-deps-svg]][dev-deps-url] [![License][license-image]][license-url] [![Downloads][downloads-im

Test if a value is Node stream-like.

Test if a value is Node writable stream-like.

Second generation object or request validator for node.js

React components for [Stripe.js and Elements](https://stripe.com/docs/stripe-js).

Test if something is an object literal

Keep your package.json version requirements satisfied

Detect when an element is ready in the DOM

Test if a value is a DataView.

Add support to do 'Spell checking', with a toggle on/off option in Settings

Test if a value is null.

An ESLint Shareable Config for video.js Standard Style.

Unit tests for .d.ts TypeScript definitions

Validates if a value is a string.

Check the licenses for the packages that you are using

Validates if a value is NaN.

Detect if DevTools is open and its orientation

Stylelint shareable config for XO

Checks if package-lock.json is Up To Date (= UTD)

check json object matches template

Check to see if a directory exists

Validates if a value is a NaN primitive.

Validates if a value is a boolean.

Check for a valid Number value.

Check that email addresses are really able to accept emails by pinging the DNS and checking for active MX records.

Validate JavaScript code and report possible syntax errors

Test if a value is ndarray-like.

Generate JavaScript-compatible regular expressions with chinese/jp/zh/cn

Fast link checker, wrapped from filiph/linkcheck

Node.js service tools for common use cases

A small and simple utility package that can validate any kind of image. It can detect corrupt files, or invalid image urls

Test if an input value is an ndarray order.

A straightforward implementation of base58-check encoding

ESlint plugin to enforces the access of specific return types.

A react-native solution to check if your app runs under battery optimization on Android devices and makes it easy for the user to disable it.

CLI tool to check your npm dependencies against a list of allowed/forbidden packages.

Check favicon with RealFaviconGenerator from the CLI

Validates if a value is a URI.

Test if an input value is a supported ndarray data type.

Determine if a buffer length is compatible with provided ndarray meta data.

A CLI tool to audit and analyze your project's dependencies.

A simple and fully customizable React checkbox input component.

Check if a Buffer/Uint8Array is a APNG (Animated PNG) image

Stylelint shareable config for the HTML Academy style

Markdown Style Guide, with linter and automatic fixer

Quickly integrate pretty checkbox Components (checkbox, switch, radio button) with Angular

A simple node module to check if a TCP port is free on the local machine.

DEPRECATED - See modern-standard.

Check the favicon of a website

Do checking...

Check dependencies in your node module

Test if an input value is a supported ndarray index mode.

The simplest way for detecting HTML content.