JSPM

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 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.

Check if the process is running with elevated privileges

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

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

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

Validate glob options

code > prettier > stylelint > formatted code

Fully customizable animated bouncy checkbox for React Native

Check if a file path is an image

Checks if an input string is a capitalized or not.

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

Standard assertion utilities.

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

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

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

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

Shallow equal check object.

Run elm-review from Node.js

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

Lint CSS for email support against caniemail database.

Test if a value is array-like.

Test if a value is a Complex64Array.

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

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

Check types

Check whether a file can be executed

Test if a value is a typed array.

Test if a value is a complex typed array.

Check if a String/Buffer is TTF

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

Check if a JavaScript environment has a DOM

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?)

Type checking for .eslintrc.json

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

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

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.

Noir ESLint shareable config

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.

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

Detect file type by signature

regexp-helper

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

Check if a Buffer/Uint8Array is a m4a file.

Check if a Buffer/Uint8Array is a wav file.

Check for outdated, incorrect, and unused dependencies.

check RegExp ( regular expressions ) support

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

Checks if a newer version is available for command line interfaces

ESLint shareable config for the HTML Academy style

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

Check if a URL exists.

[![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.

Check the licenses for the packages that you are using

Validates if a value is NaN.

Unit tests for .d.ts TypeScript definitions

Validates if a value is a string.

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

Validates if a value is a NaN primitive.

Check to see if a directory exists

Validates if a value is a boolean.

Check for a valid Number value.

Test if a value is ndarray-like.

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

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.

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

A simple and fully customizable React checkbox input component.

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.

Do checking...

Check dependencies in your node module

Check the favicon of a website

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

Checks the package-lock.json file for insecure http:// links

The simplest way for detecting HTML content.

A react native module to find the app version on play store and ios app store

Binary mirror download link replacement for mainland China

Test if an object has a specified method name, either own or inherited.

check JWT is expired or not.

A lightweight simple library for scoring passwords

Javascript Tradeshift Style - ESLint Shareable Config

Get info about npm package

JavaScript style for plugins and tools in the video.js ecosystem.

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

The Hunspell binding for nodejs that exposes as much of hunspell as possible and also adds new features. Hunspell is a first class spellcheck library used by Google, Apple, and Mozilla.

Get / Check the document readyState by Promise, when the DOM and Window is loaded

JavaScript Standard Style - ESLint Shareable Config

Static check if a hostname is a local IP address.

A tiny type checker

Update notifications for your CLI app

An implementation of gRPC health checks, written in typescript.

Check when the DOM has loaded like `DOMContentLoaded`

ESLint config for Melinda's backend applications

A typescript transformer which automatically generates validation code from your types.

Check if a url is an image

Checks if an image file has EXIF data. Available as CLI. Can be used in CI automation. Supports both JPG and WEBP image format

Node.js utility tool for creating and checking subresource integrity

Check if an input value is a valid semver version or not.

A pure css library to beautify checkbox and radio buttons.

Checks if the file path is zip file. It does not read the complete file nor it depends upon file extension

Check if Node script is running on AppVeyor

Powerful and customizable application health monitoring

Checks if all images in CSS files exists

Check whether or not a directory and its descendants are valid

Better type checking for JavaScript.

Check if two values are shallowly equal to each other.

unist utility to assert nodes

vfile utility to rename the path parts of a file

ESLint shareable config for the Tiendanube projects

Test if a value is a URI.

Reshape into a better npm audit for the community and encourage more people to include security audit into their process.

Indicates if path is symbolic link

Check if a string is a valid filename.

Check if a string is XML