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GeezerVison is showing uaparser.dev — UAParser.js: JavaScript User-Agent Parser & Device Detector

v2.0.10 Take the Hassle Out of User-Agent Detection.

Know your traffic.
Make every visit count.

Identify Browsers, Platforms, Devices, Apps, Bots, AI Crawlers and more.

TRY IT LIVE USE REST-API READ DOCS

$ npm install ua-parser-js ~11.9 kB Minified + Gzipped

ua-parser.js user-agent detected

Raw client signals input

Mozilla/5.0 (compatible; device and browser identifiers...)

Detect User-Agent ...

Structured client insights output

"browser": {
  "name": "Chrome",
  "version": "139.0.0.0"
},
"os": {
  "name": "macOS",
  "version": "15.6"
},
"device": {
  "type": "desktop"
}

Client-side Server-side

12+years maintained on GitHub

124+ MILLIONmonthly downloads on npm

Browsers & Node.jsSingle API for all environments

DEMO: USER-AGENT PLAYGROUND.

Default User-Agent string:

😵‍💫💢 Confusing 🫤❓ Inconsistent 😭💸 Costly

Identified by UAParser.js:

🙂✨ Concise 🙂💡 Insightful 🙂💰 Cost-efficient

Browser

CPU Architecture

Engine

Device Type

Device Vendor & Model

Clean & Organized

Effortless, intuitive API. Get clear, consistent results.

Wide Coverage

Detects various devices, browsers, platforms, bots, apps, and more.

Lightweight & Fast

Dependency-free. Keeps bundle size compact and efficient.

Works Everywhere

Runs seamlessly across browsers and Node.js.

npm-ready Package

Easily integrates into your existing workflow.

Lifetime Updates

Stay up-to-date with the ever-evolving trends.

TESTIMONIALS: LOVED BY THOSE WHO BUILD THE WEB.

Great Utility!

5/5

"A great utility library to have when you're investigating what kind of users are visiting your website and how you can improve their UX. Supports most browsers out there."

Gabrijel Golubić

Easier Life!

5/5

"Thanks to the awesome people who make life so much easier for developers.. The evolution of the internet has made it critical that we detect the user's device type accurately to make our apps function better and look better.".

The-Linguist

Totally Rocks!

5/5

"I've been using your library for a long time and it totally rocks!".

Christian Rich

Very Useful!

5/5

"Thank you for putting out this very useful library!".

Anuj Nijhawan

Essential Library!

5/5

"For years, it has been appreciated as a valuable tool for web developers. Its ability to accurately parse user agent strings.. has made it an essential library for many of us.".

LogRocket

SHOWCASE: FROM STARTUPS TO GLOBAL BRANDS.

Case Studies
Discover how leading companies use UAParser.js

Project details on hover

Website Accessibility Insights

Web-based App

Website

HTTP Toolkit UI

Web-based App

Kindle for iOS / Android Amazon Chime SDK for JavaScript

Facebook / FBJS

Website Gestalt

Web-based App

WP-Calypso

JavaScript SDK

Platform

Browser Sniffer Blockchain Components

Desktop Platform

Web-based Instagram

Web-based WhatsApp

Tachometer

Next.js

Apple Music Website Apple TV Website

GrabFood Web

Web-based App

Seller Center

Web-based App

Ticket & Travel Page

WebClient

Web-based App

LINE Messenger

Cloud Enterprise

Add-on Frontend

Website

Emoji Keyboard

Rocket.Chat

Web AR

CircleCI Enterprise

PWA Kit

Website

Support Desk

Website

Web & Mobile App

Website

Zoho Mail

Website

Web & Mobile Platform

Website

AliExpress Website

Website

Disney+ Website National Geographic Website

Website

Hub Website

Harp.gl

Website

Confluent Platform

Neo4j Bloom

MongoDB Charts

EMC PowerStore

Developer Console

Oracle NetSuite

Premium Services

OneView Global Dashboard

Fios TV

DOWNLOAD: SIMPLE LICENSING. FLEXIBLE DEPLOYMENT.

Package Options
Pricing & feature comparison

PRO Personal

$14 (one-time)

Non-commercial usage

Full features
npm-ready
Non-commercial usage rights
Unlimited deployments
1 year support
Lifetime updates

GET NOW

PRO Business

$29 (one-time)

1 End-Product per 1 License

Full features
npm-ready
Commercial usage rights
1 TLD per 1 license
1 year support
Lifetime updates

GET NOW

PRO Enterprise

$599 (one-time)

Full usage rights

Full features
npm-ready
Commercial usage rights
Unlimited deployments
1 year support
Lifetime updates

GET NOW

See Detailed Feature Comparison

	OSS Editions		Commercial Editions
License	MIT (v1.0)	AGPL (>=v2.0)	PRO Personal	PRO Business	PRO Enterprise
Browser detection
CPU detection
Device detection
Engine detection
OS detection
Bot detection
AI Bot detection
Extras (Apps, Libs, Emails, Media Players, etc) detection
Enhanced detection result
Client Hints support
CommonJS support
ES modules support
TypeScript declarations
npm module available
Direct downloads available
Allows commercial usage
Permissive (non-copyleft) license
No open-source obligations
Unlimited end-products
Unlimited deployments
1-year product support
Lifetime updates
Price (one-time fee)	FREE	FREE	$14	$29	$599
GET NOW

MANAGED SERVICE: UAParser.js × RESTCountries.com

REST API
Skip the installation. Use the User-Agent API

Any stack. Any platform (JS, Python, PHP, Java, Go, etc.)
No servers to maintain or parser updates periodically
Integrate in minutes with a simple REST API powered by UAParser.js

START BUILDING FOR FREE

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GeezerVison

Know your traffic.Make every visit count.

Default User-Agent string:

Identified by UAParser.js:

Clean & Organized

Wide Coverage

Lightweight & Fast

Works Everywhere

npm-ready Package

Lifetime Updates

Case StudiesDiscover how leading companies use UAParser.js

Package Options Pricing & feature comparison

REST API Skip the installation. Use the User-Agent API

Know your traffic.
Make every visit count.

Case Studies
Discover how leading companies use UAParser.js

Package Options
Pricing & feature comparison

REST API
Skip the installation. Use the User-Agent API