JSPM

Detect Node.JS (as opposite to browser environment). ESM modification

Detect if your code is running on an AWS Lambda server

Check if your code is running as an npm script

Low footprint ECMAScript source code parser

Returns true if a file path is absolute. Does not rely on the path module and can be used as a polyfill for node.js native `path.isAbolute`.

Check if something is a promise

detect available port

Regular expression for getting the root of a posix or windows filepath.

Check if a project is using Yarn

Isomorphic, functional type-checking for Javascript

Check if a file path is a text file

Check if a string matches the name of a Node.js builtin module

Detects if a file exists and returns the resolved filepath.

A simple binding to Google's cpu_features library for obtaining information about installed CPU(s)

Check if a Buffer/Uint8Array is a GZIP file

Node.js implementation of port detector

Check if a value is a Fetch network error

Find and fix unused dependencies, exports and files in your TypeScript and JavaScript projects

Check if a number is a redirect HTTP status code

Detect which package manager you're using (yarn or npm)

Return true if a file path is (or has) a dotfile. Returns false if the path is a dot directory.

Check whether operating system CPU architecture is 64-bit or 32-bit (Supports browsers)

A tool to get browser's scrollbars width.

Detect the archive type of a Buffer/Uint8Array

Check if a string is SVG

Get the operating system CPU architecture

Detect the archive type of a Buffer/Uint8Array

Determine if a filename and/or buffer is text or binary. Smarter detection than the other solutions.

Check if the process is running in a Continuous Integration (CI) environment

Check if a value is an Observable

Convert and detect character encoding in JavaScript

Checks if the given value is a window object.

find undeclared identifiers and property accesses in a javascript file.

Unpack a browser type and version from the useragent string

Check if a string is an IP address

Detect and extract the static part of a glob string

Check if a string is a scoped npm package name

Check if a Buffer/Uint8Array is a PNG image

Check if a string only contains alphanumeric characters

Classify GPU's based on their benchmark score in order to provide an adaptive experience.

Detect device type and render your component according to it

Run the Node.js binary no matter what

Check if a Buffer/Uint8Array is a GIF image

Check if a string is HTML

Detect native Symbol support.

Check if a Buffer/Uint8Array is a JPEG image

Detect native Uint32Array support.

Detect native Symbol.toStringTag support.

Detect native Float64Array support.

Detect native Uint16Array support.

Check if a Buffer/Uint8Array is a TAR file

Detect native Float32Array support.

Detect native Buffer support.

Detect the indentation of code (commonjs fork)

check if an AST node is a function of some sort

Check if browser is Firefox

Detect native Uint8Array support.

Check if a value is a `Blob`

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

Detect if the browser supports passive events

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

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

Check if Electron is running in development

Analyze circular dependencies in your JavaScript/TypeScript projects.

Check if browser is Internet Explorer

Check if the process is running inside a Podman container

Regular expression matching for URL's. Maintained, safe, and browser-friendly version of url-regex. Resolves CVE-2020-7661. Works in Node v10.12.0+ and browsers.

Checks if the given value is null or undefined

Detect and Normalize the newline characters

Collection of 70+ type, feature & value checks

check if the current node version has async_hooks.

Checks if the given value is a native function.

Detect the audio type of a Buffer/Uint8Array

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

Check if the internet connection is up

Check if servers are reachable

Detect the image type of an ArrayBuffer/Uint8Array

Detect if the current device support the specified emoji

Check if a string is an IP address

Check if a Buffer/Uint8Array is a ZIP file

capability.js - javascript environment capability detection

Detect the language of text

JavaScript wrapper for pointer and any-pointer media queries

Check if a value is a function

Check if a string is a valid filename

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

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

Detect if the browser supports the touch events api

Detect if current process is a node application or not.

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

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

Simplify detecting your browser

Detect the appearance of an element in the browser DOM

Detect the language of text

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)

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

Detect which ES6 (ES2015 and above) features are available

Check if the process is running as administrator on Windows

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

Scans a repository directory, searching for a changelog file

Detect native Int32Array support.

Detect native Int16Array support.

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

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

Checks that given package is installed globally or locally.

detect container resizing

Check if the process is running with elevated privileges

Detect native Uint8ClampedArray support.

Check if a file path is an image

ES6 and ES7 feature detection.

Detect native generator function support.

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

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

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

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

Detect native Int8Array support.

Helpers for handling mobile devices

XML detection plugin for file-type

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

Offline and Online components for React

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)

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

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

Detect native Symbol.iterator support.

Detects clicks outside React components, and also handles keypresses.

Arcjet runtime detection

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

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

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

Count syllables in English words

It's FuckAdBlock with a minimalist API.

Detect native function name support.

Check if a JavaScript environment has a DOM

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 is TTF

Check if a String/Buffer/ArrayBuffer is OTF

Check if an Array is sorted

Check if a file path is a video file

Check whether a file can be executed

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.

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

Utility to check if internet is connected or not

Get document, if there’s DOM.

check browser and browser's version from userAgent

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

Detects if a file is binary based on its content

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

Detect whether the code is running in TS Node

Check if a Buffer is a STUN message.

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

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

detect in-app browsers

Check if a Buffer/Uint8Array is WOFF

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 wav file.

Check if a Buffer/Uint8Array is a m4a file.

Check if a buffer/Uint8Array is a woff2 file

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.

Check if a Buffer/Uint8Array is EOT

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

find and identify a cycle in a directed graph

Detect structural similarities in your code

Detect the language of text

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

Detect character encoding using ICU

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

Check if a Buffer/Uint8Array is an OGG file.

Determine whether an element is completely within the browser viewport

detect available port

Detect file type by signature

Check if a Buffer/Uint8Array is a MP3 file.

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

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

Detect if DevTools is open and its orientation

Quickly detect the EOL used in a string.

JavaScript/TypeScript filter and checker for bad words aka profanity

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

Detect native DataView support.

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

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

Detect browser language

Detect when an element is ready in the DOM

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

Detect native BigInt support.

Detect native ArrayBuffer support.

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

Detect image dimensions via request.

Fast and native browser detection on Windows

Library to check unused resolvers at Ovrsea

Detect the character encoding using Google’s compact_enc_det library

Get details about the current Continuous Integration environment

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

Detect the current chrome version in the browser

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

Checks if the browser supports WebP. Cheaply and synchronously.

The simplest way for detecting HTML content.

A pitch-detection library for node and the browser

Regular expresson for matching dotfiles.

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

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

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

Check if Node script is running on AppVeyor

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

Offline and Online components for Vue

Detect the programming language of any file.

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

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

Adblock detector

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

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

Detect unused CSS in angular components

Check if a Buffer/Uint8Array is a 7ZIP file

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

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

Check whether or not a directory and its descendants are valid

Check if a Buffer/Uint8Array is a RAR file

Detect if Mocha is running

Utility methods to detect runtimes and load modules dynamically.

Check if a string is XML

Identify the network your users are using!

Scrypted CoreML Object Detection

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

Detect support for emoji character sets.

Strictly and correctly checks if value is a nodejs stream.

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

Detect the license of node.js projects and their dependencies

detects node runtime

4-directional swipe detection for react-native.

Device resolution detection module

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

Check if your code is running on Heroku

Check if browser is Safari

React component to detect browser

A path of the currently executed npm CLI

Check if your code is running as an npm script

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

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

Check whether a string has any emoji

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

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

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

detect the properties in one lib

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