UAParser.js

Powerful User-Agent detection in a compact, ES5-friendly, dependency-free JavaScript library.

• ✅ Comprehensive detection: Identify various kind of browsers, OS, devices, bots, apps, AI crawlers, and more
• ✅ Battle-tested at scale: Backed by an actively maintained, extensive detection database, trusted by leading tech companies
• ✅ Runs everywhere: Use seamlessly in browsers, Node.js, and modern JavaScript runtimes

Demo

• Live demo: https://uaparser.dev

Documentation

• version 1.x : https://docs.uaparser.dev/v1
• version 2.x : https://docs.uaparser.dev

Before upgrading from v0.7 / v1.0, please read CHANGELOG to see what's new & breaking.

Package Options

	Open-Source Editions	PRO / Commercial Editions
License options	MIT (v1.x)	AGPL (v2.x)	PRO Personal	PRO Business	PRO Enterprise
Browser Detection	⚠️	✅	✅	✅	✅
CPU Detection	⚠️	✅	✅	✅	✅
Device Detection	⚠️	✅	✅	✅	✅
Rendering Engine Detection	⚠️	✅	✅	✅	✅
OS detection	⚠️	✅	✅	✅	✅
Enhanced+ Accuracy	❌	✅	✅	✅	✅
Bot Detection	❌	✅	✅	✅	✅
AI Detection	❌	✅	✅	✅	✅
Extra Detections (Apps, Libs, Emails, Media Players, Crawlers, and more)	❌	✅	✅	✅	✅
Client Hints Support	❌	✅	✅	✅	✅
CommonJS Support	✅	✅	✅	✅	✅
ESM Support	❌	✅	✅	✅	✅
TypeScript Definitions	✅	✅	✅	✅	✅
npm Module Available	✅	✅	✅	✅	✅
Direct Downloads Available	✅	✅	✅	✅	✅
Commercial Use Allowed	✅	✅	❌	✅	✅
Permissive (non-Copyleft) License	✅	❌	✅	✅	✅
No Open-Source Obligations	✅	❌	✅	✅	✅
Unlimited End-Products	✅	✅	✅	❌	✅
Unlimited Deployments	✅	✅	✅	❌	✅
1-year Product Support	❌	❌	✅	✅	✅
Lifetime Updates	✅	✅	✅	✅	✅
Price	FREE* (License)	FREE* (License)	$14 (License)	$29 (License)	$599 (License)
GET THE PRO PACKAGES 📥

NEW: Managed REST API

Skip the installation, use the User-Agent API in any application:

• ✅ Works everywhere: Integrate with JavaScript, Python, PHP, Java, or any HTTP client
• ✅ Production-ready: Powered by UAParser.js and continuously updated
• ✅ Zero maintenance: We manage the packages, parser updates, device data, and infrastructure for you

Learn more and start building at uaparser.dev/#rest-api

Development

Contributors

This project wouldn't be possible without all the amazing people in the open-source community. Thanks to everyone who contributed, reported issues, and shared feedback.

Made with contributors-img.

Contributions are welcome! Please read the CONTRIBUTING GUIDE first for detailed contribution instructions.

Backers & Sponsors

Support the open-source editions of UAParser.js through one of the following options: