The ua-parser-js package is a utility for parsing user agent strings. It can be used to extract detailed information about the browser, engine, OS, CPU, and device from the user agent string provided by the client's browser.

What are ua-parser-js's main functionalities?

Browser Detection

This feature allows you to detect the browser name and version from the user agent string.

const UAParser = require('ua-parser-js');
const parser = new UAParser();
const browser = parser.getBrowser();
console.log(browser);

Operating System Detection

This feature enables you to determine the operating system and its version from the user agent string.

const UAParser = require('ua-parser-js');
const parser = new UAParser();
const os = parser.getOS();
console.log(os);

Device Detection

With this feature, you can identify the device type, vendor, and model from the user agent string.

const UAParser = require('ua-parser-js');
const parser = new UAParser();
const device = parser.getDevice();
console.log(device);

Engine Detection

This feature allows you to extract the layout engine name and version from the user agent string.

const UAParser = require('ua-parser-js');
const parser = new UAParser();
const engine = parser.getEngine();
console.log(engine);

CPU Architecture Detection

This feature provides information about the CPU architecture from the user agent string.

const UAParser = require('ua-parser-js');
const parser = new UAParser();
const cpu = parser.getCPU();
console.log(cpu);

Other packages similar to ua-parser-js

UAParser.js

JavaScript library to detect Browser, Engine, OS, CPU, and Device type/model from User-Agent data with relatively small footprint (~17KB minified, ~6KB gzipped) that can be used either in browser (client-side) or node.js (server-side).

Author : Faisal Salman <f@faisalman.com>
Demo : https://uaparser.dev
Source : https://github.com/faisalman/ua-parser-js
Documentation :
- v1 : https://github.com/faisalman/ua-parser-js/tree/1.0.39#documentation
- v2 : https://docs.uaparser.dev

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Documentation

UAParser([user-agent][,extensions])

typeof user-agent "string".

typeof extensions "array".

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"].

Constructor

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([uastring][,extensions])

let parser = new UAParser("user-agent"); // you need to pass the user-agent for nodejs
console.log(parser); // {}
let parserResults = parser.getResult();
console.log(parserResults);
/** {
  "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([uastring][,extensions])
- returns result object { ua: '', browser: {}, cpu: {}, device: {}, engine: {}, os: {} }

Methods

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

# '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: https://github.com/faisalman/ua-parser-js/issues/182
##########

# Possible 'device.vendor':
Acer, Alcatel, Amazon, Apple, Archos, ASUS, AT&T, BenQ, BlackBerry, Dell,
Essential, Facebook, Fairphone, GeeksPhone, Google, HP, HTC, Huawei, Infinix, 
itel, Jolla, Kobo, Lenovo, LG, Meizu, Microsoft, Motorola, Nexian, Nintendo, 
Nokia, Nothing, Nvidia, OnePlus, OPPO, Ouya, Palm, Panasonic, Pebble, Polytron, 
Realme, RIM, Roku, Samsung, Sharp, Siemens, Sony[Ericsson], Sprint, TCL, Tecno, 
Tesla, Ulefone, Vivo, Vodafone, Xbox, Xiaomi, Zebra, ZTE, ...

# 'device.model' determined dynamically

getEngine()
- returns { name: '', version: '' }

# Possible 'engine.name'
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 'os.name'
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

Usage

Using HTML

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

    var parser = new UAParser();
    console.log(parser.getResult());
    /*
        /// This will print an object structured like this:
        {
            ua: "",
            browser: {
                name: "",
                version: "",
                major: "" //@deprecated
            },
            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";
    parser.setUA(uastring1);
    var result = parser.getResult();
    // You can also use UAParser constructor directly without having to create an instance:
    // var result = 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(result.engine.name);    // "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/7.1.0.7 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"

</script>
</head>
<body>
</body>
</html>

Using node.js

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

$ 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, '127.0.0.1');

console.log('Server running at http://127.0.0.1:1337/');

Using TypeScript

$ npm install --save @types/ua-parser-js
# Download TS type definition from DefinitelyTyped repository:
# https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/ua-parser-js

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($.ua.os.name);          // "Android"
console.log($.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($.ua.browser.name);     // "Safari"
console.log($.ua.engine.name);      // "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.browser.name + ' ua-devicetype-' + $.ua.device.type);

Using npx

UAParser.js can be executed as a command that returns the parsed data in JSON format:

$ npx ua-parser-js "[INSERT-UA-HERE]"

Using Extension

UAParser([uastring,] extensions)

// Example:
var myOwnListOfBrowsers = [
    [/(mybrowser)\/([\w\.]+)/i], [UAParser.BROWSER.NAME, UAParser.BROWSER.VERSION]
];
var myParser = new UAParser({ browser: myOwnListOfBrowsers });
var myUA = 'Mozilla/5.0 MyBrowser/1.3';
console.log(myParser.setUA(myUA).getBrowser());  // {name: "MyBrowser", version: "1.3"}

Development

Backers & Sponsors

Contributors

Made with contributors-img.

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

License

MIT License

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.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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Package last updated on 11 Sep 2024

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ua-parser-js