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A not-so-lightweight-anymore JavaScript-based User-Agent string parser. Can be used either in browser (client-side) or in node.js (server-side) environment. Also available as jQuery/Zepto plugin, Bower/Meteor package, & RequireJS/AMD module. This library aims to identify detailed type of web browser, layout engine, operating system, cpu architecture, and device type/model, entirely from user-agent string with a relatively small footprint (~11KB when minified / ~4KB gzipped). Written in vanilla JavaScript, which means it doesn't require any other library and can be used independently.

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  • getBrowser()
    • returns { name: '', version: '' }
# Possible '':
Amaya, Android Browser, Arora, Avant, Baidu, Blazer, Bolt, Camino, Chimera, Chrome, 
Chromium, Comodo Dragon, Conkeror, Dillo, Dolphin, Doris, Edge, Epiphany, Fennec,
Firebird, Firefox, Flock, GoBrowser, iCab, ICE Browser, IceApe, IceCat, IceDragon, 
Iceweasel, IE [Mobile], Iron, Jasmine, K-Meleon, Konqueror, Kindle, Links, 
Lunascape, Lynx, Maemo, Maxthon, Midori, Minimo, MIUI Browser, [Mobile] Safari, 
Mosaic, Mozilla, Netfront, Netscape, NetSurf, Nokia, OmniWeb, Opera [Mini/Mobi/Tablet], 
PhantomJS, Phoenix, Polaris, QQBrowser, RockMelt, Silk, Skyfire, SeaMonkey, SlimBrowser,
Swiftfox, Tizen, UCBrowser, Vivaldi, w3m, WeChat, Yandex
# 'browser.version' determined dynamically
  • getDevice()
    • returns { model: '', type: '', vendor: '' }
# Possible 'device.type':
console, mobile, tablet, smarttv, wearable, embedded
# Possible 'device.vendor':
Acer, Alcatel, Amazon, Apple, Archos, Asus, BenQ, BlackBerry, Dell, GeeksPhone, 
Google, HP, HTC, Huawei, Jolla, Lenovo, LG, Meizu, Microsoft, Motorola, Nexian, 
Nintendo, Nokia, Nvidia, Ouya, Palm, Panasonic, Polytron, RIM, Samsung, Sharp, 
Siemens, Sony-Ericsson, Sprint, Xbox, ZTE
# 'device.model' determined dynamically
  • getEngine()
    • returns { name: '', version: '' }
# Possible ''
Amaya, EdgeHTML, Gecko, iCab, KHTML, Links, Lynx, NetFront, NetSurf, Presto, 
Tasman, Trident, w3m, WebKit
# 'engine.version' determined dynamically
  • getOS()
    • returns { name: '', version: '' }
# Possible ''
AIX, Amiga OS, Android, Arch, Bada, BeOS, BlackBerry, CentOS, Chromium OS, Contiki,
Fedora, Firefox OS, FreeBSD, Debian, DragonFly, Gentoo, GNU, Haiku, Hurd, iOS, 
Joli, Linpus, Linux, Mac OS, Mageia, Mandriva, MeeGo, Minix, Mint, Morph OS, NetBSD, 
Nintendo, OpenBSD, OpenVMS, OS/2, Palm, PCLinuxOS, Plan9, Playstation, QNX, RedHat, 
RIM Tablet OS, RISC OS, Sailfish, Series40, Slackware, Solaris, SUSE, Symbian, Tizen, 
Ubuntu, UNIX, VectorLinux, WebOS, Windows [Phone/Mobile], Zenwalk
# 'os.version' determined dynamically
  • getCPU()
    • returns { architecture: '' }
# Possible 'cpu.architecture'
68k, amd64, arm, arm64, avr, ia32, ia64, irix, irix64, mips, mips64, pa-risc, 
ppc, sparc, sparc64
  • getResult()

    • returns { ua: '', browser: {}, cpu: {}, device: {}, engine: {}, os: {} }
  • getUA()

    • returns UA string of current instance
  • setUA(uastring)

    • set & parse UA string


<!doctype html>
<script type="text/javascript" src="ua-parser.min.js"></script>
<script type="text/javascript">
    var parser = new UAParser();
    // by default it takes ua string from current browser's window.navigator.userAgent 
        /// this will print an object structured like this:
            ua: "",
            browser: {
                name: "",
                version: ""
            engine: {
                name: "",
                version: ""
            os: {
                name: "",
                version: ""
            device: {
                model: "",
                type: "",
                vendor: ""
            cpu: {
                architecture: ""
    // let's test a custom user-agent string as an example 
    var uastring = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.2 (KHTML, like Gecko) Ubuntu/11.10 Chromium/15.0.874.106 Chrome/15.0.874.106 Safari/535.2";
    var result = parser.getResult();
    // this will also produce the same result (without instantiation): 
    // var result = UAParser(uastring); 
    console.log(result.browser);        // {name: "Chromium", version: "15.0.874.106"}
    console.log(result.device);         // {model: undefined, type: undefined, vendor: undefined}
    console.log(result.os);             // {name: "Ubuntu", version: "11.10"}
    console.log(result.os.version);     // "11.10"
    console.log(;    // "WebKit"
    console.log(result.cpu.architecture);   // "amd64"
    // do some other tests 
    var uastring2 = "Mozilla/5.0 (compatible; Konqueror/4.1; OpenBSD) KHTML/4.1.4 (like Gecko)";
    console.log(parser.setUA(uastring2).getBrowser().name); // "Konqueror"
    console.log(parser.getOS());                            // {name: "OpenBSD", version: undefined}
    console.log(parser.getEngine());                        // {name: "KHTML", version: "4.1.4"}
    var uastring3 = 'Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; en-US) AppleWebKit/534.11 (KHTML, like Gecko) Version/ Safari/534.11';
    console.log(parser.setUA(uastring3).getDevice().model); // "PlayBook"
    console.log(parser.getOS())                             // {name: "RIM Tablet OS", version: "1.0.0"}
    console.log(parser.getBrowser().name);                  // "Safari"

Using node.js

$ npm install ua-parser-js
var http = require('http');
var parser = require('ua-parser-js');
http.createServer(function (req, res) {
    // get user-agent header 
    var ua = parser(req.headers['user-agent']);
    // write the result as response 
    res.end(JSON.stringify(ua, null, '  '));
.listen(1337, '');
console.log('Server running at');

Using requirejs

    baseUrl : 'js/lib', // path to your script directory 
    paths   : {
        'ua-parser-js' : 'ua-parser.min'
requirejs(['ua-parser-js'], function(UAParser) {
    var parser = new UAParser();

Using bower

$ bower install ua-parser-js

Using meteor

$ meteor add faisalman:ua-parser-js

Using jQuery/Zepto ($.ua)

Although written in vanilla js (which means it doesn't depends on jQuery), this library will automatically detect if jQuery/Zepto is present and create $.ua object based on browser's user-agent (although in case you need, window.UAParser constructor is still present). To get/set user-agent you can use: $.ua.get() / $.ua.set(uastring).

// In browser with default user-agent: 'Mozilla/5.0 (Linux; U; Android 2.3.4; en-us; Sprint APA7373KT Build/GRJ22) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0': 
// Do some tests 
console.log($.ua.device);           // {vendor: "HTC", model: "Evo Shift 4G", type: "mobile"} 
console.log($.ua.os);               // {name: "Android", version: "2.3.4"} 
console.log($;          // "Android" 
console.log($.ua.get());            // "Mozilla/5.0 (Linux; U; Android 2.3.4; en-us; Sprint APA7373KT Build/GRJ22) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0" 
// reset to custom user-agent 
$.ua.set('Mozilla/5.0 (Linux; U; Android 3.0.1; en-us; Xoom Build/HWI69) AppleWebKit/534.13 (KHTML, like Gecko) Version/4.0 Safari/534.13');
// Test again 
console.log($;     // "Safari" 
console.log($;      // "Webkit" 
console.log($.ua.device);           // {vendor: "Motorola", model: "Xoom", type: "tablet"} 
console.log(parseInt($.ua.browser.version.split('.')[0], 10));  // 4 

Extending regex patterns

  • UAParser(uastring[, extensions])

Pass your own regexes to extend the limited matching rules.

// Example: 
var uaString = 'MyOwnBrowser/1.3';
var myOwnRegex = [[/(myownbrowser)\/([\w\.]+)/i], [UAParser.BROWSER.NAME, UAParser.BROWSER.VERSION]];
var parser = new UAParser(uaString, { browser: myOwnRegex });
console.log(parser.getBrowser());   // {name: "MyOwnBrowser", version: "1.3"} 



  • Fork and clone this repository
  • Make some changes as required
  • Write a unit test to showcase your feature
  • Run the test suites to make sure the changes you made didn't break anything
$ npm run test
  • Commit and push to your own repository
  • Submit a pull request to this repository under develop branch
  • Profit?


Build a minified & packed script

$ npm run build


Dual licensed under GPLv2 & MIT

Copyright © 2012-2016 Faisal Salman <>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.