Lightweight JavaScript-based user-agent string parser


Lightweight JavaScript-based User-Agent string parser. Supports browser & node.js environment. Also available as Component package, Bower package,, & AMD module

  • Author : Faisalman <>
  • Demo :
  • Source :
$ component install component/user-agent-parser
var parse = require('user-agent-parser');
parse('user agent string')
// => Object 

Extract detailed type of web browser, layout engine, operating system, and device purely from user-agent string with relatively lightweight footprint (~7KB minified / ~3KB gzipped). Written in vanilla js, which means it doesn't depends on any other library.

  • getBrowser()
    • returns { name: '', major: '', version: '' }
# Possible '':
Amaya, Arora, Avant, Baidu, Blazer, Bolt, Camino, Chimera, Chrome, Chromium,
Comodo Dragon, Conkeror, Dillo, Dolphin, Doris, Epiphany, Fennec, Firebird,
Firefox, Flock, GoBrowser, iCab, ICE Browser, IceApe, IceCat, Iceweasel,
IE [Mobile], Jasmine, K-Meleon, Konqueror, Kindle, Links, Lunascape, Lynx, Maemo,
Maxthon, Midori, Minimo, [Mobile] Safari, Mosaic, Mozilla, Netfront, Netscape,
NetSurf, Nokia, OmniWeb, Opera [Mini/Mobi/Tablet], Phoenix, Polaris, RockMelt,
Silk, Skyfire, SeaMonkey, SlimBrowser, Swiftfox, Tizen, UCBrowser, w3m, Yandex
# 'browser.version' & 'browser.major' determined dynamically
  • getDevice()
    • returns { model: '', type: '', vendor: '' }
# Possible 'device.type':
console, mobile, tablet
# Possible 'device.vendor':
Acer, Alcatel, Apple, Asus, BenQ, BlackBerry, Dell, GeeksPhone, HP, HTC, Huawei,
Lenovo, LG, Meizu, Motorola, Nexian, Nintendo, Nokia, Palm, Panasonic,
RIM, Samsung, Siemens, Sony-Ericsson, Sprint, ZTE
# 'device.model' determined dynamically
  • getEngine()
    • returns { name: '', version: '' }
# Possible ''
Amaya, 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,
Fedora, Firefox OS, FreeBSD, Debian, DragonFly, Gentoo, GNU, Haiku, Hurd, iOS,
Joli, Linux, Mac OS, Mandriva, MeeGo, Minix, Mint, Morph OS, NetBSD, Nintendo,
OpenBSD, OS/2, Palm, PCLinuxOS, Plan9, Playstation, QNX, RedHat, RIM Tablet OS,
RISC OS, Slackware, Solaris, SUSE, Symbian, Tizen, Ubuntu, UNIX, WebOS,
Windows [Phone/Mobile], Zenwalk
# 'os.version' determined dynamically
  • getCPU()
    • returns { architecture: '' }
# Possible 'cpu.architecture'
68k, amd64, arm, ia32, ia64, irix, mips, pa-risc, ppc, sparc
  • getResult()
    • returns { 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:
            browser: {
                name: "",
                version: "",
                major: ""
            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", major: "15", 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"
$ npm install ua-parser-js
var UAParser = require('ua-parser-js');
var parser = new UAParser();
var ua = request.headers['user-agent'];     // user-agent header from an HTTP request 
require(['ua-parser'], function(UAParser) {
    var parser = new UAParser();
$ component install faisalman/ua-parser-js
var UAParser = require('ua-parser-js');
var parser = new UAParser();
$ bower install ua-parser-js

Although written in vanilla js (which means it doesn't depends on jQuery), this library will automatically detect if jQuery 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 

Install dependencies

$ npm install jshint
$ npm install mocha
$ npm install uglify-js

Verify, test, & minify script

$ ./build/

Dual licensed under GPLv2 & MIT

Copyright © 2012-2013 Faisalman <>

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.