How to detect browser, engine, OS, CPU, and device using JavaScript?

In this tutorial, I’ll be talking about a JavaScript-based User-Agent string parser to detect browser, engine, OS, CPU, and device using JavaScript. UAParser.js is a JavaScript Plugin that can be used either in browser (client-side) or in NodeJS (server-side) environment. UAParser is also available as jQuery/Zepto Pluging, Bower/Meteor Package and 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).

Also see: How to remove text from String in JavaScript?

Written in vanilla JavaScript, which means it doesn’t require any other library and can be used independently. However, it’s not recommended to use this library as browser detection since the result may not be more accurate than using feature detection.

How to detect browser, engine, OS, CPU, and device using JavaScript?

Here’s an example code to detect browser, engine, OS, CPU and Device using JavaScript.

<!doctype html>
<html>
<head>
<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
    console.log(parser.getResult());
    /*
        /// 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";
    parser.setUA(uastring);

    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(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>

How to detect browser, engine, OS, CPU, and device in NodeJS?

Here’s an example code to detect browser, engine, OS, CPU and Device using JavaScript in NodeJS. To use this package in NodeJS you need to install ua-parser-js package.

$ npm install ua-parser-js

After installing ua-parser-js package, you can now use this code to detect browser, engine, OS, CPU and Device using JavaScript in NodeJS.

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 CDN

You can also use this CDN detect browser, engine, OS, CPU, and device using JavaScript.

<script src="https://cdn.jsdelivr.net/npm/ua-parser-js@0/dist/ua-parser.min.js"></script>

Detect browser, engine, OS, CPU, and device using jQuery

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($.ua.os.name);          // "Android"
console.log($.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"

// 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($.ua.browser.name);     // "Safari"
console.log($.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);

Credits of this Plugin:

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