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JavaScript library to detect Browser, Engine, OS, CPU, and Device type/model from User-Agent & Client-Hints data that can be used either in browser (client-side) or node.js (server-side).

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51degrees @51degrees/ua-parser-js

UAParser.js has been upgraded to detect comprehensive device data based on the User-Agent and User-Agent Client Hints.

This package supports all device types including Apple and Android devices and can be used either in a browser (client-side) or Node.js environment (server-side).

Visit 51Degrees UAParser to get started.

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Version 2.0

What's new & breaking, please read CHANGELOG before upgrading.



In the browser environment you dont need to pass the user-agent string to the function, you can just call the funtion and it should automatically get the string from the window.navigator.userAgent, but that is not the case in nodejs. The user-agent string must be passed in' nodejs for the function to work. Usually you can find the user agent in: request.headers["user-agent"].


When you call UAParser with the new keyword, UAParser will return a new instance with an empty result object, you have to call one of the available methods to get the information from the user-agent string. Like so:

  • new UAParser([user-agent:string][,extensions:object][,headers:object(since@2.0)])
let parser = new UAParser("your user-agent here"); // you need to pass the user-agent for nodejs
console.log(parser); // {}
let parserResults = parser.getResult();
/** {
  "ua"      : "",
  "browser" : {},
  "engine"  : {},
  "os"      : {},
  "device"  : {},
  "cpu"     : {}
} */

When you call UAParser without the new keyword, it will automatically call getResult() function and return the parsed results.

  • UAParser([user-agent:string][,extensions:object][,headers:object(since@2.0)])
    • returns result object { ua: '', browser: {}, cpu: {}, device: {}, engine: {}, os: {} }


Methods table

The methods are self explanatory, here's a small overview on all the available methods:

  • getResult() - returns all function object calls, user-agent string, browser info, cpu, device, engine, os: { ua: '', browser: {}, cpu: {}, device: {}, engine: {}, os: {} }.

  • getBrowser() - returns the browser name and version.

  • getDevice() - returns the device model, type, vendor.

  • getEngine() - returns the current browser engine name and version.

  • getOS() - returns the running operating system name and version.

  • getCPU() - returns CPU architectural design name.

  • getUA() - returns the user-agent string.

  • setUA(user-agent) - set a custom user-agent to be parsed.

  • getResult()

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

    • returns { name: '', version: '' }
# Possible '':
2345Explorer, 360 Browser, Amaya, Android Browser, Arora, Avant, Avast, AVG,
BIDUBrowser, Baidu, Basilisk, Blazer, Bolt, Brave, Bowser, Camino, Chimera,
[Mobile] Chrome [Headless/WebView], Chromium, Cobalt, Comodo Dragon, Dillo,
Dolphin, Doris, DuckDuckGo, Edge, Electron, Epiphany, Facebook, Falkon, Fennec, 
Firebird, [Mobile] Firefox [Focus/Reality], Flock, Flow, GSA, GoBrowser, HeyTap,
Huawei Browser, ICE Browser, IE, IEMobile, IceApe, IceCat, IceDragon, Iceweasel, 
Instagram, Iridium, Iron, Jasmine, Kakao[Story/Talk], K-Meleon, Kindle, Klar, 
Konqueror, LBBROWSER, Line, LinkedIn, Links, Lunascape, Lynx, MIUI Browser, 
Maemo Browser, Maemo, Maxthon, MetaSr Midori, Minimo, Mosaic, Mozilla, NetFront, 
NetSurf, Netfront, Netscape, NokiaBrowser, Obigo, Oculus Browser, OmniWeb, 
Opera Coast, Opera [Mini/Mobi/Tablet], PaleMoon, PhantomJS, Phoenix, Polaris, 
Puffin, QQ, QQBrowser, QQBrowserLite, Quark, QupZilla, RockMelt, [Mobile] Safari, 
Sailfish Browser, Samsung Browser, SeaMonkey, Silk, Skyfire, Sleipnir, Slim, 
SlimBrowser, Swiftfox, Tesla, TikTok, Tizen Browser, UCBrowser, UP.Browser, Viera, 
Vivaldi, Waterfox, WeChat, Weibo, Yandex, baidu, iCab, w3m, Whale Browser, ...

# 'browser.version' determined dynamically
  • getDevice()
    • returns { model: '', type: '', vendor: '' }
# Possible 'device.type':
console, mobile, tablet, smarttv, wearable, embedded

# NOTE: 'desktop' is not a possible device type. 
# UAParser only reports info directly available from the UA string, which is not the case for 'desktop' device type.
# If you wish to detect desktop devices, you must handle the needed logic yourself.
# You can read more about it in this issue:

# Possible 'device.vendor':
Acer, Alcatel, Amazon, Apple, Archos, ASUS, AT&T, BenQ, BlackBerry, Dell,
Essential, Facebook, Fairphone, GeeksPhone, Google, HP, HTC, Huawei, Jolla, Kobo,
Lenovo, LG, Meizu, Microsoft, Motorola, Nexian, Nintendo, Nokia, Nvidia, OnePlus, 
OPPO, Ouya, Palm, Panasonic, Pebble, Polytron, Realme, RIM, Roku, Samsung, Sharp, 
Siemens, Sony[Ericsson], Sprint, Tesla, Vivo, Vodafone, Xbox, Xiaomi, Zebra, ZTE, ...

# 'device.model' determined dynamically
  • getEngine()
    • returns { name: '', version: '' }
# Possible ''
Amaya, Blink, EdgeHTML, Flow, Gecko, Goanna, iCab, KHTML, LibWeb, Links, Lynx, 
NetFront, NetSurf, Presto, Tasman, Trident, w3m, WebKit

# 'engine.version' determined dynamically
  • getOS()
    • returns { name: '', version: '' }
# Possible ''
AIX, Amiga OS, Android[-x86], Arch, Bada, BeOS, BlackBerry, CentOS, Chromium OS,
Contiki, Fedora, Firefox OS, FreeBSD, Debian, Deepin, DragonFly, elementary OS, 
Fuchsia, Gentoo, GhostBSD, GNU, Haiku, HarmonyOS, HP-UX, Hurd, iOS, Joli, KaiOS, 
Linpus, Linspire,Linux, Mac OS, Maemo, Mageia, Mandriva, Manjaro, MeeGo, Minix, 
Mint, Morph OS, NetBSD, NetRange, NetTV, Nintendo, OpenBSD, OpenVMS, OS/2, Palm, 
PC-BSD, PCLinuxOS, Plan9, PlayStation, QNX, Raspbian, RedHat, RIM Tablet OS, 
RISC OS, Sabayon, Sailfish, SerenityOS, Series40, Slackware, Solaris, SUSE, Symbian, 
Tizen, Ubuntu, Unix, VectorLinux, Viera, watchOS, WebOS, Windows [Phone/Mobile], 
Zenwalk, ...

# 'os.version' determined dynamically
  • getCPU()
    • returns { architecture: '' }
# Possible 'cpu.architecture'
68k, amd64, arm[64/hf], avr, ia[32/64], irix[64], mips[64], pa-risc, ppc, sparc[64]
  • getUA()

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

    • set UA string to be parsed
    • returns current instance

* is():boolean utility since@2.0

// Is just a shorthand comparison to check whether the value of specified item equals one of its properties (in a case-insensitive way)
// so that instead of write it using `==` operator like this:

let ua = UAParser();
let device = ua.device;
let os = ua.os;

if (device.type == "mobile" && != "iOS") {}
if (device.type == "smarttv" || device.vendor == "Samsung") {}

// we can also write the comparison above into as follow:

if ("mobile") && !"iOS")) {}
if ("SmartTV") ||"SaMsUnG")) {}

    For device, properties will be checked in this particular order: type, model, vendor

// Another examples:

let uap = new UAParser('Mozilla/5.0 (Mobile; Windows Phone 8.1; Android 4.0; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 635) like iPhone OS 7_0_3 Mac OS X AppleWebKit/537 (KHTML, like Gecko) Mobile Safari/537');

uap.getBrowser().name;              // "IEMobile"
uap.getBrowser().is("IEMobile");    // true
uap.getCPU().is("ARM");             // true

uap.getOS().name;                   // "Windows Phone"
uap.getOS().is("Windows Phone");    // true

uap.getDevice();                    // { vendor: "Nokia", model: "Lumia 635", type: "mobile" }
uap.getResult().device;             // { vendor: "Nokia", model: "Lumia 635", type: "mobile" }

let device = uap.getDevice();"mobile");                // true"Lumia 635");             // true"Nokia");                 // true"iPhone");                // false
uap.getResult()"Nokia"); // true
uap.getResult().device.model;       // "Lumia 635"

uap.setUA("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36");

let browser = uap.getBrowser();"IEMobile");             // false"Chrome");               // true

uap.getResult()"Edge"); // false
uap.getResult()             // "Mac OS"
uap.getResult()"Mac OS");    // true
uap.getResult().os.version;         // "10.6.8"

let engine = uap.getEngine();"Blink");                 // true

* toString():string utility since@2.0

// Retrieve full-name values as a string

    Values will be concatenated following this pattern:
    * browser : name + version
    * cpu : architecture 
    * device : vendor + model
    * engine : name + version
    * os : name + version

// Usage examples

let uap = new UAParser('Mozilla/5.0 (Mobile; Windows Phone 8.1; Android 4.0; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 635) like iPhone OS 7_0_3 Mac OS X AppleWebKit/537 (KHTML, like Gecko) Mobile Safari/537');

uap.getDevice();                    // { 
                                    //    vendor: "Nokia", 
                                    //    model: "Lumia 635", 
                                    //    type: "mobile"
                                    // }
uap.getDevice().toString();         // "Nokia Lumia 635"

uap.getResult();            // "Windows Phone"
uap.getResult().os.version;         // "8.1"
uap.getResult().os.toString();      // "Windows Phone 8.1"

uap.setUA("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36");
uap.getBrowser().name;              // "Chrome"
uap.getBrowser().version;           // "28.0.1500.95"
uap.getBrowser().major;             // "28"
uap.getBrowser().toString();        // "Chrome 28.0.1500.95"

let engine = uap.getEngine();;                        // "Blink"
engine.version;                     // "28.0.1500.95"
engine.toString();                  // "Blink 28.0.1500.95"

* withClientHints():Promise<object>|Thenable<object>|object since@2.0

Recently, Chrome limits the information exposed through user-agent and introduces a new experimental set of data called "client-hints". In browser-environment, obtaining the client-hints data via JavaScript must be done in an asynchronous way. In UAParser you can chain the result object from get* method with withClientHints() to also read the client-hints data from the browser and return the updated data as a Promise.

// client-side example
(async function () {  
    let ua = new UAParser();

    // get browser data from user-agent only :
    let browser = ua.getBrowser();
    console.log('Using User-Agent: ', browser);

    // get browser data from client-hints (with user-agent as fallback) :
    browser = await ua.getBrowser().withClientHints();
    console.log('Using Client-Hints: ', browser);

    // alternatively :
    ua.getBrowser().withClientHints().then(function (browser) {
        console.log('Using Client-Hints: ', browser);

Along with User-Agent HTTP header, Chrome also sends this client-hints data by default under Sec-CH-UA-* HTTP headers in each request. In server-side development, you can capture this extra information by passing the req.headers to UAParser() (see examples below). When using withClientHints() in nodejs environment and browser without client-hints support (basically anything that's not Chromium-based), it will returns a new object with updated data.

// server-side example

// Suppose we got a request having these HTTP headers: 
const request = {
    headers : {
        'user-agent' : 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36',

        'sec-ch-ua-mobile' : '?1',
        'sec-ch-ua-model' : 'Galaxy S3 Marketing',
        'sec-ch-ua-platform' : 'Android'

const result1 = UAParser(request.headers);                      // parse only "user-agent" header
const result2 = UAParser(request.headers).withClientHints();    // update with "sec-ch-ua" headers

console.log(;       // "Linux"
console.log(result1.device.type);   // undefined
console.log(result1.device.model);  // undefined

console.log(;       // "Android"
console.log(result2.device.type);   // "mobile"
console.log(result2.device.model);  // "Galaxy S3 Marketing"

new UAParser(request.headers)
        .then((browser) => {
    console.log(browser.toString());    // Chrome 

Extending Regex

If you want to detect something that's not currently provided by UAParser.js (eg: bots, specific apps, etc), you can pass a list of regexes to extend internal UAParser.js regexes with your own.

  • UAParser([uastring,] extensions [,headers:object(since@2.0)])
// Example:
const myOwnListOfBrowsers = [
    [/(mybrowser)\/([\w\.]+)/i], [UAParser.BROWSER.NAME, UAParser.BROWSER.VERSION, ['type', 'bot']]

const myUA = 'Mozilla/5.0 MyBrowser/1.3';

let myParser = new UAParser({ browser: myOwnListOfBrowsers });

console.log(myParser.setUA(myUA).getBrowser());  // {name: "MyBrowser", version: "1.3", major: "1", type : "bot"}
console.log(myParser.getBrowser().is('bot'));    // true

// Another example:
const myOwnListOfDevices = [
    [/(mytab) ([\w ]+)/i], [UAParser.DEVICE.VENDOR, UAParser.DEVICE.MODEL, [UAParser.DEVICE.TYPE, UAParser.DEVICE.TABLET]],
    [/(myphone)/i], [UAParser.DEVICE.VENDOR, [UAParser.DEVICE.TYPE, UAParser.DEVICE.MOBILE]]

const myUA2 = 'Mozilla/5.0 MyTab 14 Pro Max';

let myParser2 = new UAParser({
    browser: myOwnListOfBrowsers,
    device: myOwnListOfDevices

console.log(myParser2.setUA(myUA2).getDevice());  // {vendor: "MyTab", model: "14 Pro Max", type: "tablet"}

Some basic extensions (although not very complete at the moment) can also be found under ua-parser-js/extensions submodule.

import { UAParser } from 'ua-parser-js';
import { Emails } from 'ua-parser-js/extensions';

const browser = new UAParser(Emails)
                        .setUA('Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0')

console.log(; // Thunderbird


Using HTML

<!doctype html>
<script src="ua-parser.min.js"></script>

    var uap = new UAParser();
        /// This will print an object structured like this:
            ua: "",
            browser: {
                name: "",
                version: "",
                major: ""
            engine: {
                name: "",
                version: ""
            os: {
                name: "",
                version: ""
            device: {
                model: "",
                type: "",
                vendor: ""
            cpu: {
                architecture: ""
    // Default result depends on current window.navigator.userAgent value

    // Now let's try a custom user-agent string as an example
    var uastring1 = "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 = uap.getResult();
    // You can also use UAParser constructor directly without having to create an instance:
    // var ua = UAParser(uastring1);

    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(uap.setUA(uastring2).getBrowser().name); // "Konqueror"
    console.log(uap.getOS());                            // {name: "OpenBSD", version: undefined}
    console.log(uap.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(uap.setUA(uastring3).getDevice().model); // "PlayBook"
    console.log(uap.getOS())                             // {name: "RIM Tablet OS", version: "1.0.0"}
    console.log(uap.getBrowser().name);                  // "Safari"


Using node.js

Note: Device information is not available in the NodeJS environment.

$ npm install ua-parser-js
var http = require('http');
var uap = require('ua-parser-js');

http.createServer(function (req, res) {
    // get user-agent header
    var ua = uap(req.headers['user-agent']);

    /* // BEGIN since@2.0 - you can also pass client-hints data to UAParser

    // note: only works in secure context (https:// or localhost or file://)

    var getHighEntropyValues = 'Sec-CH-UA-Full-Version-List, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform, Sec-CH-UA-Platform-Version, Sec-CH-UA-Arch, Sec-CH-UA-Bitness';
    res.setHeader('Accept-CH', getHighEntropyValues);
    res.setHeader('Critical-CH', getHighEntropyValues);
    var ua = uap(req.headers).withClientHints();

    // END since@2.0 */

    // write the result as response
    res.end(JSON.stringify(ua, null, '  '));
.listen(1337, '');

console.log('Server running at');

Using ES Modules

import { UAParser } from 'ua-parser-js';

const { browser, cpu, device } = UAParser('Mozilla/5.0 (X11; U; Linux armv7l; en-GB; rv:1.9.2a1pre) Gecko/20090928 Firefox/3.5 Maemo Browser RX-51 N900');

console.log(;          // Maemo Browser
console.log('arm'));         // true
console.log('mobile'));   // true
console.log(device.model);          // N900

Using TypeScript

$ npm install --save @types/ua-parser-js
# Download TS type definition from DefinitelyTyped repository:

Using jQuery/Zepto ($.ua)

Although written in vanilla js, this library will automatically detect if jQuery/Zepto is present and create $.ua object (with values based on its User-Agent) along with window.UAParser constructor. To get/set user-agent you can use: $.ua.get() / $.ua.set(uastring).

// Say we are in a 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':

// Get the details
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"

// Now lets try to reset to another 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

// Add class to <body> tag
// <body class="ua-browser-safari ua-devicetype-tablet">
$('body').addClass('ua-browser-' + $ + ' ua-devicetype-' + $.ua.device.type);


Backers & Sponsors


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How To Contribute

  • Fork and clone this repository
  • Make some changes as required
  • Write unit test to showcase its functionality
  • Run the test suites to make sure it's not breaking anything $ npm test
  • Submit a pull request under develop branch


MIT License

Copyright (c) 2012-2023 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.