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

Get details about the current Continuous Integration environment

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

Check if the process is running inside a Docker container

Check if a file path is a binary file

Detect whether the terminal supports Unicode

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 or not an object is a Typed Array

Detect the indentation of code

Detect whether a terminal supports hyperlinks

Detect if the current environment is a CI server

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

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

Check if your package was installed globally

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

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

Check if your code is running as an npm script

Detect if your code is running on an AWS Lambda server

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.

Low footprint ECMAScript source code parser

detect available port

Isomorphic, functional type-checking for Javascript

Check if something is a promise

Check if a file path is a text file

Detects if a file exists and returns the resolved filepath.

Check if a project is using Yarn

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

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

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

Check if a value is a Fetch network error

Check if a number is a redirect HTTP status code

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

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

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

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

Convert and detect character encoding in JavaScript

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

Check if a value is an Observable

Unpack a browser type and version from the useragent string

find undeclared identifiers and property accesses in a javascript file.

Checks if the given value is a window object.

Check if a string is a scoped npm package name

Check if a string is an IP address

Detect and extract the static part of a glob string

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

Check if a string is HTML

Detect native Symbol.toStringTag support.

Check if a Buffer/Uint8Array is a JPEG image

Detect native Symbol support.

Detect native Float32Array support.

Detect native Float64Array support.

Detect native Uint16Array support.

Detect native Buffer support.

Detect native Uint32Array support.

Check if a Buffer/Uint8Array is a TAR file

check if an AST node is a function of some sort

Detect the indentation of code (commonjs fork)

Check if browser is Firefox

Check if a value is a `Blob`

Detect native Uint8Array support.

Detect if the browser supports passive events

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

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

Analyze circular dependencies in your JavaScript/TypeScript projects.

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

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 Electron is running in development

Check if the process is running inside a Podman container

Check if browser is Internet Explorer

Checks if the given value is null or undefined

Detect and Normalize the newline characters

Collection of 70+ type, feature & value checks

Detect the audio type of a Buffer/Uint8Array

Checks if the given value is a native function.

check if the current node version has async_hooks.

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

Check if the internet connection is up

Check if a string is an IP address

Detect if the current device support the specified emoji

Check if servers are reachable

Detect the image type of an ArrayBuffer/Uint8Array

Check if a Buffer/Uint8Array is a ZIP file

capability.js - javascript environment capability detection

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

Check if a string is a valid filename

Detect the language of text

JavaScript wrapper for hover and any-hover media queries

Check if a Buffer/Uint8Array is a BZIP2 file

Check if a value is a function

JavaScript wrapper for pointer and any-pointer media queries

Detect if the browser supports the touch events api

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

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

Detect the language of text

Simplify detecting your browser

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

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

Detect which ES6 (ES2015 and above) features are available

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

Checks that given package is installed globally or locally.

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

detect container resizing

Detect native Int32Array support.

Detect native Int16Array support.

Detect native Uint8ClampedArray support.

Scans a repository directory, searching for a changelog file

ES6 and ES7 feature detection.

Check if the process is running with elevated privileges

Check if a file path is an image

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

Offline and Online components for React

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

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

Detect native Symbol.iterator support.

Arcjet runtime detection

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

Detects clicks outside React components, and also handles keypresses.

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

Check if a String/Buffer is TTF

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 an Array is sorted

Check if a String/Buffer/ArrayBuffer is OTF

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.

Utility to check if internet is connected or not

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.

check browser and browser's version from userAgent

Detects if a file is binary based on its content

Check if a Buffer is a STUN message.

Detect whether the code is running in TS Node

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.

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

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

Check if a Buffer/Uint8Array is WOFF

detect in-app browsers

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

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.

Detect the language of text

Detect character encoding using ICU

Check if a Buffer/Uint8Array is a FLAC file.

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 EOT

Check if a Buffer/Uint8Array is a m4a file.

Check if a Buffer/Uint8Array is a wav file.

Detect structural similarities in your code

find and identify a cycle in a directed graph

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

Detect file type by signature

Determine whether an element is completely within the browser viewport

detect available port

Check if a Buffer/Uint8Array is an OGG file.

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

Check if a Buffer/Uint8Array is a MP3 file.

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

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

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.

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 browser language

Detect native BigInt support.

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

Detect native ArrayBuffer support.

Library to check unused resolvers at Ovrsea

Detect image dimensions via request.

Detect the character encoding using Google’s compact_enc_det library

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

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

Detect the current chrome version in the browser

Fast and native browser detection on Windows

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

migration tool for sequelize & typescript users

Get details about the current Continuous Integration environment

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

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

A pitch-detection library for node and the browser

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

The simplest way for detecting HTML content.

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

Checks if the browser supports WebP. Cheaply and synchronously.

Regular expresson for matching dotfiles.

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

Detect the programming language of any file.

Check if Node script is running on AppVeyor

Adblock detector

Offline and Online components for Vue

Detect unused CSS in angular components

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

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

Check if a Buffer/Uint8Array is a 7ZIP file

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

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

Scrypted CoreML Object Detection

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

Check if a string is XML

Detect if Mocha is running

Check if a Buffer/Uint8Array is a RAR file

Utility methods to detect runtimes and load modules dynamically.

Identify the network your users are using!

Detect support for emoji character sets.

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