JSPM

Check if browser is Firefox

Check if the process is running inside a Podman container

Check if a Buffer/Uint8Array is available for cwebp image source

Detect if a device is mouse only, touch only, or hybrid

check if the current node version has async_hooks.

Analyze circular dependencies in your JavaScript/TypeScript projects.

Device detection (phone, tablet, desktop, mobile grade, os, versions)

Check if Electron is running in development

Check if servers are reachable

Collection of 70+ type, feature & value checks

Checks if the given value is null or undefined

Detect and Normalize the newline characters

Detect the audio type of a Buffer/Uint8Array

check if an AST node is a MemberExpression, in general or a specific one

Check if a Buffer/Uint8Array is a ZIP file

Checks if the given value is a native function.

Check if a value is a function

Check if a string is an IP address

Detect if the current device support the specified emoji

Check if the internet connection is up

capability.js - javascript environment capability detection

Check if a string is a valid filename

Detect the image type of an ArrayBuffer/Uint8Array

A proxy to `path`, replacing `\` with `/` for all results

Check if a Buffer/Uint8Array is a BZIP2 file

JavaScript wrapper for hover and any-hover media queries

Detect the language of text

Detect if current process is a node application or not.

JavaScript wrapper for pointer and any-pointer media queries

Detect if the browser supports the touch events api

Detect the language of text

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

Detect and validate file types by their signatures (✨magic numbers✨)

Charset Detector - Detect the encoding and language of text files - Use it in the browser, with Node.js, or via CLI

Simplify detecting your browser

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

Detect which ES6 (ES2015 and above) features are available

Detect native Uint8ClampedArray support.

detect container resizing

Analyze circular dependencies in your JavaScript/TypeScript projects with Rust.

Scans a repository directory, searching for a changelog file

Detect native Int16Array support.

Detect native Int32Array support.

Resolve the preferred locale based on the value of an `Accept-Language` HTTP header.

Check if the process is running as administrator on Windows

Detect the appearance of an element in the browser DOM

Get the name of a project, from package.json, git config, or basename of the current working directory.

Detect native Int8Array support.

Checks that given package is installed globally or locally.

Detect native generator function support.

Wrapper component that detects element resize and passes new dimensions down the tree. Based on [element-resize-detector](https://github.com/wnr/element-resize-detector)

JavaScript module detecting bots/crawlers/spiders via user-agent

XML detection plugin for file-type

Helpers for handling mobile devices

Instantly detect support for WEBP images in the browser in 0.2KB

ES6 and ES7 feature detection.

Simple and Performant Language detection library (pure JS and zero dependencies)

Check if the process is running with elevated privileges

Check if a file path is an image

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

Detects clicks outside React components, and also handles keypresses.

Language detection for Javascript. Based on the CLD2 (Compact Language Detector) library from Google. Highly optimized for space and speed. Runs about 10x faster than other libraries. Detects over 160 languages. Full test coverage. Runs on Linux, OS X, an

Checks the filesystem for potential license files and attempts to detect what they are

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

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

Get the language associated with a file extension or the extensions associated with a language using the data from GitHub's [Linguist YAML file](https://github.com/github/linguist/blob/master/lib/linguist/languages.yml)

Count syllables in English words

Offline and Online components for React

Detect the MIME type of a Buffer, Uint8Array, ArrayBuffer, ReadableStream, file path and file name, with async method.

Detect native Symbol.iterator support.

Arcjet runtime detection

Check if a JavaScript environment has a DOM

Check whether a file can be executed

Check if a file path is a video file

Provides utilities to check if ad block is enabled on a page via both a React hook and a wrapper component.

Get document, if there’s DOM.

It's FuckAdBlock with a minimalist API.

Detect native function name support.

A Svelte action that monitors an element enters or leaves the viewport or a parent element. Performant and efficient thanks to using Intersection Observer under the hood.

Check if a String/Buffer is TTF

Check if an Array is sorted

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

Regex for matching dot-directories, like `.git/`

Executes a command when a change is detected in specified files. Not an active file watcher.

Check if a String/Buffer/ArrayBuffer is OTF

Utility to check if internet is connected or not

🃏 Minimalistic isomorphic library for detection of platform, runtime, APIs and more.

Detect whether the code is running in TS Node

check browser and browser's version from userAgent

detect in-app browsers

Check if a Buffer is a STUN message.

Detects if a file is binary based on its content

Check if a Buffer/Uint8Array is WOFF

Get the version of the package.json file found in the given directory or in one of its parents.

Detects active internet connection, and API server status in Angular application.

Detect if the network is up (do we have connectivity?)

Check if a Buffer/Uint8Array is EOT

find and identify a cycle in a directed graph

JavaScript module to check if user agent to return the device and browser.

Check if a Buffer/Uint8Array is a FLAC file.

Check if a buffer/Uint8Array is a woff2 file

Detect the language of text

Check if a Buffer/Uint8Array is a MP3 file.

Detect Node.JS (as opposite to browser environment) (reliable)

Lint HTML and template source files for hardcoded (untranslated) strings

Detect character encoding using ICU

Quickly detect the EOL used in a string.

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

Regular expression matching for email addresses. Maintained, configurable, more accurate, and browser-friendly alternative to email-regex. Works in Node v14+ and browsers. Made for Spam Scanner and Forward Email.

Read a glob of files, dynamically choosing the reader or requiring the files based on the file extension.

Detect file type by signature

Detect if DevTools is open and its orientation

Check if a Buffer/Uint8Array is a m4a file.

Check if a Buffer/Uint8Array is a wav file.

Detect structural similarities in your code

Determine whether an element is completely within the browser viewport

Check if a Buffer/Uint8Array is an OGG file.

Discover the variable names chosen for each of a file's top-level required modules

detect available port

A simple, performant, and cross-browser hook for handling scroll in your next react app.

Detect browser language

Detect native DataView support.

Detect native BigInt support.

Glin-Profanity is a lightweight and efficient npm package designed to detect and filter profane language in text inputs across multiple languages. Whether you’re building a chat application, a comment section, or any platform where user-generated content

JavaScript/TypeScript filter and checker for bad words aka profanity

Detect image dimensions via request.

Fast and native browser detection on Windows

Detect when an element is ready in the DOM

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

Get details about the current Continuous Integration environment

Detect native ArrayBuffer support.

Regular expression for matching words in a string. Support for english, CJK and Cyrillic.

Regular expresson for matching dotfiles.

Library to check unused resolvers at Ovrsea

Simple module for getting the current mouse position in element or window.

Detect the character encoding using Google’s compact_enc_det library

Adblock detector

Converts between RSA key formats, detecting input format (PEM, DER, PKCS1, PKCS8). No OpenSSL needed.

Detect the current chrome version in the browser

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

Detect copy-pasted and structurally similar code. Supports ES2020 standard (and most proposed features), TS and TSX files. Using Babel 8's parser.

Detects where the current browser extension code is being run. Compatible with Firefox, Chrome and derivates.

migration tool for sequelize & typescript users

A pitch-detection library for node and the browser

The React hook to detect if the device is mobile or desktop.

A browser detection package that uses feature detection instead of user agent

JS Library to detect browser, os and device based on the UserAgent String, forked by John Carmichael for ease of use.

Detect unused CSS in angular components

Match the words in a string. Support for english, CJK and Cyrillic.

Feature detection in the browser before loading polyfill using services like polyfill.io

A React component that renders its children if an ad blocker is detected

Checks if internet is available using http2, node v8.4.0+ only

The simplest way for detecting HTML content.

Checks if the browser supports WebP. Cheaply and synchronously.

Detect the programming language of any file.

Offline and Online components for Vue

Detects whether browser has an active internet connection or not in Angular application.

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

Check if a Buffer/Uint8Array is a 7ZIP file

Detect if Mocha is running

Check if Node script is running on AppVeyor

A microlibrary to detect whether Node.js runs inside a Docker container or not

Check if browser is Safari

Check whether or not a directory and its descendants are valid

Detect support for emoji character sets.

Check if a string is XML

Scrypted CoreML Object Detection

detects node runtime

4-directional swipe detection for react-native.

Device resolution detection module

Which GitHub page are you on? Is it an issue? Is it a list? Perfect for your WebExtension or userscript.

Detect environment (native, server side, web, etc.)

Detect the license of node.js projects and their dependencies

Check if a Buffer/Uint8Array is a RAR file

React component to detect browser

Utility methods to detect runtimes and load modules dynamically.

Identify the network your users are using!

Check if your code is running as an npm script

Automatically moderate your content with Moderation API

Detectizr is a Modernizr extension to detect device, browser, operating system and screen.

Fork of cld with pre-built binaries for OS X and Linux. Language detection for Javascript. Based on the CLD2 (Compact Language Detector) library from Google. Highly optimized for space and speed. Runs about 10x faster than other libraries. Detects over 16

A path of the currently executed npm CLI

Convert a mime type to a file extension. It works only with popular mime types and it's super lightweight.

Check if your code is running on Heroku

detect the properties in one lib

Scrypted Video Analysis Plugin. Installed alongside a detection service like OpenCV or TensorFlow.

Convert CSS color strings to RGBA and check whether they are light or dark

Hunt down `.only`s before it's too late.

Check if a given string is css compatible color value

Check whether a string has any emoji

Check if a value is a Fetch network error

Detect if a Node.js process is in the debug mode.

Scrypted OpenVINO Object Detection

Superset of RESPONSIVE DIRECTIVES to show or hide items according to the size of the device screen and another features in Angular 9

@wora NetInfo

Strictly and correctly checks if value is a nodejs stream.

A CommonJS port from the ESM file-type package. Now fixed to not have 'tarHeaderChecksumMatches' error!

Detect the current iOS version in the browser

Multi Languages Detection for Text-Mining and Natural Language Processing - True ITK - Open Source

Check if a value is an error constructor

Detects Dependencies In The Source File.

Detect if a visitor is coming through a webview or a native browser using user-agent.

Get the users' most preferred locale/language from your app's available translations with zero dependencies

react network detection hooks

Parse HTTP headers to detect the device type, model, operating system, browser, and crawler information

Detect if a string contains traditional or simplified Chinese characters.

Modified version of Nick Drewe's tc or sc checker.

Check if a Buffer/Uint8Array is a WebP image

detect container resizing

An *Ackchyually* browser compatible file-type hacky replacement of the `file-type` package. Forked from https://github.com/sindresorhus/file-type

Check if a `package-lock.json` is present in the working directory

Check if a Buffer/Uint8Array is a 7ZIP file

CLI to detect the language of text

Detects browser and React Native source-code bundlers

Check if pnpm is available.

It's FuckAdBlock with a minimalist API.

Check if a number is a HTTP success status code

Detect lockfiles in the working directory

Detect whether a terminal or browser supports ansi colors.

Synchronously check if a file is a symbolic link

Check if a project is using pnpm.

A module to verify if there's an active internet connection with Node.js

Detect raspberry pi revision

Check if a Buffer/Uint8Array is a TIFF image

Detect the file type of a Buffer/Uint8Array in ES5 (can be used for browser and create-react-app

Report browser settings like whatsmybrowser.org.

Check Internet Availability for your vue app

Superset of RESPONSIVE DIRECTIVES to show or hide items according to the size of the device screen and another features in Angular 2

Check if a string is an IP address. This is a fork of sindresorhus/is-ip, but with CommonJS support.

A small utility to detect screen (viewport) size (resolution height and width) and listener to resize event with additional features

A device detector plugin of Vue 3

Check if a Buffer/Uint8Array is a JPEG XR image

Call a callback when an image has loaded - adapted from desandro/imagesloaded

Check if a Buffer/Uint8Array is a BMP image

Check if a Buffer/Uint8Array is a PSD image

Check if a filepath has extension(s)

Platform detection: NodeJS? React? ReactNative? Expo? etc.

Server side mrz (Machine Readable Zone) scanner.

Hijacks NodeJS Stream and emits events when newline(s) written to the output.

Detect the OS from a User-Agent string.

Javascript detect retina screen (javascript detect device pixel ratio / density)

ecmascript version detector

@wora Detect Network

Detect the width and height of images in a stream

Make detecting user's OS less annoying

React adblock detector

Detect whether you're running on node.js or io.js

Magic number detector for javascript

Check if JPEG images are progressive

Check if your code is running on Travis