JSPM

Detect whether a terminal supports color

Check if argv has a specific flag

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

Check if something is a Node.js stream

Get details about the current Continuous Integration environment

Check if a file path is a binary file

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

Detect whether the terminal supports Unicode

Check if the process is running inside a Docker container

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

Check if something is a generator function

Detect whether a terminal supports hyperlinks

Detect the indentation of code

Detect if the current environment is a CI server

Check if stdout or stderr is interactive

Detect whether or not an object is a Typed Array

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

Check if your package was installed globally

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

Detect if your code is running on an AWS Lambda server

Check if your code is running as an npm script

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

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

Check if something is a promise

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

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

Check if a project is using Yarn

Check if a file path is a text file

detect available port

Detects if a file exists and returns the resolved filepath.

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`.

Isomorphic, functional type-checking for Javascript

Check if a value is a Fetch network error

Low footprint ECMAScript source code parser

Node.js implementation of port detector

Check if a Buffer/Uint8Array is a GZIP file

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

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

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)

Check if a value is an Observable

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

Detect the archive type of a Buffer/Uint8Array

Get the operating system CPU architecture

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

Convert and detect character encoding in JavaScript

A tool to get browser's scrollbars width.

Detect the archive type of a Buffer/Uint8Array

Check if a string is an IP address

Unpack a browser type and version from the useragent string

Detect and extract the static part of a glob string

Check if a string is SVG

Detect device type and render your component according to it

Check if a Buffer/Uint8Array is a PNG image

find undeclared identifiers and property accesses in a javascript file.

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

Check if a string only contains alphanumeric characters

Check if a string is a scoped npm package name

Checks if the given value is a window object.

Check if a Buffer/Uint8Array is a JPEG image

Detect native Symbol support.

Detect native Uint32Array support.

Run the Node.js binary no matter what

Detect native Symbol.toStringTag support.

Detect native Float32Array support.

Check if a string is HTML

Detect native Uint8Array support.

Check if a Buffer/Uint8Array is a TAR file

Check if a Buffer/Uint8Array is a GIF image

Detect native Buffer support.

Detect the indentation of code (commonjs fork)

Detect native Uint16Array support.

Detect native Float64Array support.

check if an AST node is a function of some sort

Check if browser is Internet Explorer

Check if a value is a `Blob`

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

Check if browser is Firefox

Analyze circular dependencies in your JavaScript/TypeScript projects.

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

check if the current node version has async_hooks.

Check if Electron is running in development

Detect if the browser supports passive events

Check if the process is running inside a Podman container

Collection of 70+ type, feature & value checks

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.

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

Check if a value is a function

Check if servers are reachable

Check if a Buffer/Uint8Array is a ZIP file

Detect and Normalize the newline characters

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

Checks if the given value is null or undefined

Detect the image type of an ArrayBuffer/Uint8Array

Detect the audio type of a Buffer/Uint8Array

Checks if the given value is a native function.

Detect if the current device support the specified emoji

Check if a string is an IP address

Check if a Buffer/Uint8Array is a BZIP2 file

Check if the internet connection is up

capability.js - javascript environment capability detection

Detect the language of text

JavaScript wrapper for pointer and any-pointer media queries

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

Check if the current Linux session is using Wayland

Check if a string is a valid filename

Detect if current process is a node application or not.

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

Detect the language of text

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

Detect the appearance of an element in the browser DOM

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

Simplify detecting your browser

Check if the process is running as administrator on Windows

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

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

Checks that given package is installed globally or locally.

XML detection plugin for file-type

Detect native Int32Array 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)

Detect native Int16Array support.

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

Detect which ES6 (ES2015 and above) features are available

Detect native Int8Array support.

ES6 and ES7 feature detection.

Detect native generator function support.

Scans a repository directory, searching for a changelog file

Helpers for handling mobile devices

detect container resizing

Detect native Uint8ClampedArray support.

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

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

Check if the process is running with elevated privileges

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

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

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

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

Arcjet runtime detection

Detects clicks outside React components, and also handles keypresses.

Check if a file path is an image

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

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

Detect native Symbol.iterator support.

Offline and Online components for React

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

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

Check whether a file can be executed

Check if an Array is sorted

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.

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

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

Detect native function name support.

Get document, if there’s DOM.

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

Check if a Buffer is a STUN message.

Check if a String/Buffer is TTF

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 JavaScript environment has a DOM

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

It's FuckAdBlock with a minimalist API.

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

Utility to check if internet is connected or not

Check if a String/Buffer/ArrayBuffer is OTF

Detect whether the code is running in TS Node

detect in-app browsers

Detects if a file is binary based on its content

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

Check if a Buffer/Uint8Array is EOT

JavaScript/TypeScript filter and checker for bad words aka profanity

Check if a Buffer/Uint8Array is WOFF

check browser and browser's version from userAgent

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

Determine whether an element is completely within the browser viewport

Detect the language of text

Check if a buffer/Uint8Array is a woff2 file

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

Check if a Buffer/Uint8Array is a FLAC file.

find and identify a cycle in a directed graph

Detect file type by signature

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

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

Check if a Buffer/Uint8Array is a MP3 file.

Detect structural similarities in your code

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 an OGG file.

Detect character encoding using ICU

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

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

Fast and native browser detection on Windows

Check if a Buffer/Uint8Array is a m4a file.

Check if a Buffer/Uint8Array is a wav file.

Quickly detect the EOL used in a string.

Scrypted OpenVINO Object Detection

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

Detect if DevTools is open and its orientation

Detect when an element is ready in the DOM

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

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.

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

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

Detect native ArrayBuffer support.

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

Check if Node script is running on AppVeyor

detect available port

Library to check unused resolvers at Ovrsea

migration tool for sequelize & typescript users

Get details about the current Continuous Integration environment

A pitch-detection library for node and the browser

Detect native BigInt support.

Detect browser language

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

Detect image dimensions via request.

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

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

Detect the character encoding using Google’s compact_enc_det library

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

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

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

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

Offline and Online components for Vue

Detect the programming language of any file.

Detect if Mocha is running

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

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

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

Scrypted CoreML Object Detection

The simplest way for detecting HTML content.

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

Regular expresson for matching dotfiles.

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

Checks if the browser supports WebP. Cheaply and synchronously.

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

Check if a given string is css compatible color value

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

Detect whether a terminal or browser supports ansi colors.

Detect the current chrome version in the browser

A path of the currently executed npm CLI

Check if a string is XML

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

Check if a value is an error constructor