JSPM

Detect whether a terminal supports color

Check if argv has a specific flag

Check if something is a Node.js stream

Check if the character represented by a given Unicode code point is fullwidth

Check if a file path is a binary file

Check if the process is running inside Windows Subsystem for Linux (Bash on Windows)

Get details about the current Continuous Integration environment

Check if the process is running inside a Docker container

Detect whether or not an object is a Typed Array

Detect whether the terminal supports Unicode

Detect the indentation of code

Detect the file type of a file, stream, or data

Check if something is a generator function

Check if stdout or stderr is interactive

Detect whether a terminal supports hyperlinks

Detect if the current environment is a CI server

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

Check if your package was installed globally

Check which JavaScript environment your code is running in at runtime: browser, Node.js, Bun, etc

Check if your code is running as an npm script

Detect if your code is running on an AWS Lambda server

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

Check if the process is running inside a container (Docker/Podman)

detect available port

Check if something is a promise

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`.

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

Isomorphic, functional type-checking for Javascript

Check if a project is using Yarn

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

Check if a file path is a text file

Detects if a file exists and returns the resolved filepath.

Check if a Buffer/Uint8Array is a GZIP file

Node.js implementation of port detector

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

Check if a number is a redirect HTTP status code

Check if a value is a Fetch network error

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

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

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

Detect the archive type of a Buffer/Uint8Array

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

A tool to get browser's scrollbars width.

Check if a string is SVG

Check if a value is an Observable

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

Get the operating system CPU architecture

Checks if the given value is a window object.

Convert and detect character encoding in JavaScript

Detect and extract the static part of a glob string

Unpack a browser type and version from the useragent string

find undeclared identifiers and property accesses in a javascript file.

Check if a string is a scoped npm package name

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

Check if a string is an IP address

Detect the archive type of a Buffer/Uint8Array

Check if a Buffer/Uint8Array is a PNG image

Detect device type and render your component according to it

Check if a string only contains alphanumeric characters

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

Run the Node.js binary no matter what

Check if a Buffer/Uint8Array is a GIF image

Detect native Symbol.toStringTag support.

Check if a Buffer/Uint8Array is a JPEG image

Detect native Symbol support.

Detect native Float32Array support.

Detect native Uint32Array support.

Detect native Float64Array support.

Detect native Uint16Array support.

Check if a string is HTML

Detect native Buffer support.

Detect native Uint8Array support.

check if an AST node is a function of some sort

Check if a Buffer/Uint8Array is a TAR file

Check if Electron is running in development

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

Detect the indentation of code (commonjs fork)

Detect the audio type of a Buffer/Uint8Array

Check if a value is a `Blob`

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

Check if browser is Firefox

Detect if the browser supports passive events

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

check if the current node version has async_hooks.

Analyze circular dependencies in your JavaScript/TypeScript projects.

Checks if the given value is null or undefined

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.

Check if browser is Internet Explorer

Collection of 70+ type, feature & value checks

Check if the process is running inside a Podman container

Detect and Normalize the newline characters

Checks if the given value is a native function.

Check if servers are reachable

Check if a Buffer/Uint8Array is a ZIP file

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

Check if the internet connection is up

capability.js - javascript environment capability detection

Detect the image type of a Buffer/Uint8Array

Check if a value is a function

Check if a string is an IP address

Check if a string is a valid filename

Detect if the current device support the specified emoji

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

Detect native generator function support.

Check if a Buffer/Uint8Array is a BZIP2 file

JavaScript wrapper for pointer and any-pointer media queries

JavaScript wrapper for hover and any-hover media queries

Detect if the browser supports the touch events api

Detect the language of text

Scans a repository directory, searching for a changelog file

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

ES6 and ES7 feature detection.

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)

Detect which ES6 (ES2015 and above) features are available

Detect if current process is a node application or not.

Detect the language of text

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

Checks that given package is installed globally or locally.

Detect native Int32Array support.

Detect native Int16Array support.

Detect native Uint8ClampedArray support.

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

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

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

detect container resizing

Check if the process is running as administrator on Windows

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

Detect native Int8Array support.

Detect native Symbol.iterator support.

Helpers for handling mobile devices

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

Check if a file path is an image

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

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

Check if the process is running with elevated privileges

Get details about the current Continuous Integration environment

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

Detects clicks outside React components, and also handles keypresses.

Offline and Online components for React

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

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

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

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

Detect native function name support.

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

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

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

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

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 FLAC file.

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

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

Detect the appearance of an element in the browser DOM

Check if a Buffer/Uint8Array is an OGG file.

Check if a JavaScript environment has a DOM

Check if a Buffer/Uint8Array is a MP3 file.

Count syllables in English words

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

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

Detects if a file is binary based on its content

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

Get document, if there’s DOM.

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)

Check if a String/Buffer/ArrayBuffer is OTF

Detect if DevTools is open and its orientation

Check if an Array is sorted

It's FuckAdBlock with a minimalist API.

Utility to check if internet is connected or not

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

Check if a file path is a video file

check browser and browser's version from userAgent

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

Detect whether the code is running in TS Node

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

Check whether a file can be executed

Check if a Buffer is a STUN message.

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

Check if a Buffer/Uint8Array is WOFF

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.

Detect character encoding using ICU

Check if a buffer/Uint8Array is a woff2 file

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

Check if a Buffer/Uint8Array is EOT

detect in-app browsers

find and identify a cycle in a directed graph

Detect structural similarities in your code

Detect file type by signature

Determine whether an element is completely within the browser viewport

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

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

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

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

Detect the character encoding using Google’s compact_enc_det library

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

Detect the language of text

Detect browser language

Regular expresson for matching dotfiles.

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

JavaScript/TypeScript filter and checker for bad words aka profanity

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

Detect native DataView support.

React component to detect browser

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

Detect native ArrayBuffer support.

Detect image dimensions via request.

Detect the current chrome version in the browser

Adblock detector

Detect when an element is ready in the DOM

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

Detect native BigInt support.

Library to check unused resolvers at Ovrsea

The simplest way for detecting HTML content.

Check if Node script is running on AppVeyor

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

Fast and native browser detection on Windows

Detect docx file type from buffer

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

Detect if file buffer is an OOXML file type

detect available port

Quickly detect the EOL used in a string.

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

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

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

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

migration tool for sequelize & typescript users

CLI to detect the language of text

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

Offline and Online components for Vue

Check if a given string is css compatible color value

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

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

Checks if the browser supports WebP. Cheaply and synchronously.

Scrypted CoreML Object Detection

Detect the programming language of any file.

Strictly and correctly checks if value is a nodejs stream.

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

A path of the currently executed npm CLI

Does the string resemble an HTML or XHTML (or neither)?

Identify the network your users are using!

Check whether a string has any emoji

Modern browsers do not support autoplay with sound unless the user or browser autoplay algorithm allows it. see https://developer.chrome.com/blog/autoplay/ .

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

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

Detect if Mocha is running

Detect device type and render your component according to it

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