How to find the operating system details using JavaScript?

JavascriptOperating SystemUser Agent

Javascript Problem Overview

How can I find the OS name and OS version using JavaScript?

Javascript Solutions

Solution 1 - Javascript

I started to write a Script to read OS and browser version that can be tested on Fiddle. Feel free to use and extend.
Breaking Change:
Since September 2020 the new Edge gets detected. So 'Microsoft Edge' is the new version based on Chromium and the old Edge is now detected as 'Microsoft Legacy Edge'!

/**
 * JavaScript Client Detection
 * (C) viazenetti GmbH (Christian Ludwig)
 */
(function (window) {
	{
		var unknown = '-';

		// screen
		var screenSize = '';
		if (screen.width) {
			width = (screen.width) ? screen.width : '';
			height = (screen.height) ? screen.height : '';
			screenSize += '' + width + " x " + height;
		}

		// browser
		var nVer = navigator.appVersion;
		var nAgt = navigator.userAgent;
		var browser = navigator.appName;
		var version = '' + parseFloat(navigator.appVersion);
		var majorVersion = parseInt(navigator.appVersion, 10);
		var nameOffset, verOffset, ix;

		// Opera
		if ((verOffset = nAgt.indexOf('Opera')) != -1) {
			browser = 'Opera';
			version = nAgt.substring(verOffset + 6);
			if ((verOffset = nAgt.indexOf('Version')) != -1) {
				version = nAgt.substring(verOffset + 8);
			}
		}
		// Opera Next
		if ((verOffset = nAgt.indexOf('OPR')) != -1) {
			browser = 'Opera';
			version = nAgt.substring(verOffset + 4);
		}
		// Legacy Edge
		else if ((verOffset = nAgt.indexOf('Edge')) != -1) {
			browser = 'Microsoft Legacy Edge';
			version = nAgt.substring(verOffset + 5);
		} 
		// Edge (Chromium)
		else if ((verOffset = nAgt.indexOf('Edg')) != -1) {
			browser = 'Microsoft Edge';
			version = nAgt.substring(verOffset + 4);
		}
		// MSIE
		else if ((verOffset = nAgt.indexOf('MSIE')) != -1) {
			browser = 'Microsoft Internet Explorer';
			version = nAgt.substring(verOffset + 5);
		}
		// Chrome
		else if ((verOffset = nAgt.indexOf('Chrome')) != -1) {
			browser = 'Chrome';
			version = nAgt.substring(verOffset + 7);
		}
		// Safari
		else if ((verOffset = nAgt.indexOf('Safari')) != -1) {
			browser = 'Safari';
			version = nAgt.substring(verOffset + 7);
			if ((verOffset = nAgt.indexOf('Version')) != -1) {
				version = nAgt.substring(verOffset + 8);
			}
		}
		// Firefox
		else if ((verOffset = nAgt.indexOf('Firefox')) != -1) {
			browser = 'Firefox';
			version = nAgt.substring(verOffset + 8);
		}
		// MSIE 11+
		else if (nAgt.indexOf('Trident/') != -1) {
			browser = 'Microsoft Internet Explorer';
			version = nAgt.substring(nAgt.indexOf('rv:') + 3);
		}
		// Other browsers
		else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) < (verOffset = nAgt.lastIndexOf('/'))) {
			browser = nAgt.substring(nameOffset, verOffset);
			version = nAgt.substring(verOffset + 1);
			if (browser.toLowerCase() == browser.toUpperCase()) {
				browser = navigator.appName;
			}
		}
		// trim the version string
		if ((ix = version.indexOf(';')) != -1) version = version.substring(0, ix);
		if ((ix = version.indexOf(' ')) != -1) version = version.substring(0, ix);
		if ((ix = version.indexOf(')')) != -1) version = version.substring(0, ix);

		majorVersion = parseInt('' + version, 10);
		if (isNaN(majorVersion)) {
			version = '' + parseFloat(navigator.appVersion);
			majorVersion = parseInt(navigator.appVersion, 10);
		}

		// mobile version
		var mobile = /Mobile|mini|Fennec|Android|iP(ad|od|hone)/.test(nVer);

		// cookie
		var cookieEnabled = (navigator.cookieEnabled) ? true : false;

		if (typeof navigator.cookieEnabled == 'undefined' && !cookieEnabled) {
			document.cookie = 'testcookie';
			cookieEnabled = (document.cookie.indexOf('testcookie') != -1) ? true : false;
		}

		// system
		var os = unknown;
		var clientStrings = [
			{s:'Windows 10', r:/(Windows 10.0|Windows NT 10.0)/},
			{s:'Windows 8.1', r:/(Windows 8.1|Windows NT 6.3)/},
			{s:'Windows 8', r:/(Windows 8|Windows NT 6.2)/},
			{s:'Windows 7', r:/(Windows 7|Windows NT 6.1)/},
			{s:'Windows Vista', r:/Windows NT 6.0/},
			{s:'Windows Server 2003', r:/Windows NT 5.2/},
			{s:'Windows XP', r:/(Windows NT 5.1|Windows XP)/},
			{s:'Windows 2000', r:/(Windows NT 5.0|Windows 2000)/},
			{s:'Windows ME', r:/(Win 9x 4.90|Windows ME)/},
			{s:'Windows 98', r:/(Windows 98|Win98)/},
			{s:'Windows 95', r:/(Windows 95|Win95|Windows_95)/},
			{s:'Windows NT 4.0', r:/(Windows NT 4.0|WinNT4.0|WinNT|Windows NT)/},
			{s:'Windows CE', r:/Windows CE/},
			{s:'Windows 3.11', r:/Win16/},
			{s:'Android', r:/Android/},
			{s:'Open BSD', r:/OpenBSD/},
			{s:'Sun OS', r:/SunOS/},
			{s:'Chrome OS', r:/CrOS/},
			{s:'Linux', r:/(Linux|X11(?!.*CrOS))/},
			{s:'iOS', r:/(iPhone|iPad|iPod)/},
			{s:'Mac OS X', r:/Mac OS X/},
			{s:'Mac OS', r:/(Mac OS|MacPPC|MacIntel|Mac_PowerPC|Macintosh)/},
			{s:'QNX', r:/QNX/},
			{s:'UNIX', r:/UNIX/},
			{s:'BeOS', r:/BeOS/},
			{s:'OS/2', r:/OS\/2/},
			{s:'Search Bot', r:/(nuhk|Googlebot|Yammybot|Openbot|Slurp|MSNBot|Ask Jeeves\/Teoma|ia_archiver)/}
		];
		for (var id in clientStrings) {
			var cs = clientStrings[id];
			if (cs.r.test(nAgt)) {
				os = cs.s;
				break;
			}
		}

		var osVersion = unknown;

		if (/Windows/.test(os)) {
			osVersion = /Windows (.*)/.exec(os)[1];
			os = 'Windows';
		}

		switch (os) {
			case 'Mac OS':
			case 'Mac OS X':
			case 'Android':
				osVersion = /(?:Android|Mac OS|Mac OS X|MacPPC|MacIntel|Mac_PowerPC|Macintosh) ([\.\_\d]+)/.exec(nAgt)[1];
				break;

			case 'iOS':
				osVersion = /OS (\d+)_(\d+)_?(\d+)?/.exec(nVer);
				osVersion = osVersion[1] + '.' + osVersion[2] + '.' + (osVersion[3] | 0);
				break;
		}
		
		// flash (you'll need to include swfobject)
		/* script src="//ajax.googleapis.com/ajax/libs/swfobject/2.2/swfobject.js" */
		var flashVersion = 'no check';
		if (typeof swfobject != 'undefined') {
			var fv = swfobject.getFlashPlayerVersion();
			if (fv.major > 0) {
				flashVersion = fv.major + '.' + fv.minor + ' r' + fv.release;
			}
			else  {
				flashVersion = unknown;
			}
		}
	}

	window.jscd = {
		screen: screenSize,
		browser: browser,
		browserVersion: version,
		browserMajorVersion: majorVersion,
		mobile: mobile,
		os: os,
		osVersion: osVersion,
		cookies: cookieEnabled,
		flashVersion: flashVersion
	};
}(this));

alert(
	'OS: ' + jscd.os +' '+ jscd.osVersion + '\n' +
	'Browser: ' + jscd.browser +' '+ jscd.browserMajorVersion +
	  ' (' + jscd.browserVersion + ')\n' + 
	'Mobile: ' + jscd.mobile + '\n' +
	'Flash: ' + jscd.flashVersion + '\n' +
	'Cookies: ' + jscd.cookies + '\n' +
	'Screen Size: ' + jscd.screen + '\n\n' +
	'Full User Agent: ' + navigator.userAgent
);

Solution 2 - Javascript

If you list all of window.navigator's properties using

console.log(navigator);

You'll see something like this

# platform = Win32
# appCodeName = Mozilla
# appName = Netscape
# appVersion = 5.0 (Windows; en-US)
# language = en-US
# mimeTypes = [object MimeTypeArray]
# oscpu = Windows NT 5.1
# vendor = Firefox
# vendorSub = 1.0.7
# product = Gecko
# productSub = 20050915
# plugins = [object PluginArray]
# securityPolicy =
# userAgent = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7
# cookieEnabled = true
# javaEnabled = function javaEnabled() { [native code] }
# taintEnabled = function taintEnabled() { [native code] }
# preference = function preference() { [native code] }

Note that oscpu attribute gives you the Windows version. Also, you should know that:

'Windows 3.11' => 'Win16',
'Windows 95' => '(Windows 95)|(Win95)|(Windows_95)',
'Windows 98' => '(Windows 98)|(Win98)',
'Windows 2000' => '(Windows NT 5.0)|(Windows 2000)',
'Windows XP' => '(Windows NT 5.1)|(Windows XP)',
'Windows Server 2003' => '(Windows NT 5.2)',
'Windows Vista' => '(Windows NT 6.0)',
'Windows 7' => '(Windows NT 6.1)',
'Windows 8' => '(Windows NT 6.2)|(WOW64)',
'Windows 10' => '(Windows 10.0)|(Windows NT 10.0)',
'Windows NT 4.0' => '(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)',
'Windows ME' => 'Windows ME',
'Open BSD' => 'OpenBSD',
'Sun OS' => 'SunOS',
'Linux' => '(Linux)|(X11)',
'Mac OS' => '(Mac_PowerPC)|(Macintosh)',
'QNX' => 'QNX',
'BeOS' => 'BeOS',
'OS/2' => 'OS/2',
'Search Bot'=>'(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp)|(MSNBot)|(Ask Jeeves/Teoma)|(ia_archiver)'

Solution 3 - Javascript

var OSName = "Unknown";
if (window.navigator.userAgent.indexOf("Windows NT 10.0")!= -1) OSName="Windows 10";
if (window.navigator.userAgent.indexOf("Windows NT 6.3") != -1) OSName="Windows 8.1";
if (window.navigator.userAgent.indexOf("Windows NT 6.2") != -1) OSName="Windows 8";
if (window.navigator.userAgent.indexOf("Windows NT 6.1") != -1) OSName="Windows 7";
if (window.navigator.userAgent.indexOf("Windows NT 6.0") != -1) OSName="Windows Vista";
if (window.navigator.userAgent.indexOf("Windows NT 5.1") != -1) OSName="Windows XP";
if (window.navigator.userAgent.indexOf("Windows NT 5.0") != -1) OSName="Windows 2000";
if (window.navigator.userAgent.indexOf("Mac")            != -1) OSName="Mac/iOS";
if (window.navigator.userAgent.indexOf("X11")            != -1) OSName="UNIX";
if (window.navigator.userAgent.indexOf("Linux")          != -1) OSName="Linux";

Solution 4 - Javascript

JavaScript have access to the window.navigator.platform - a string representing the platform of the browser: https://developer.mozilla.org/en-US/docs/Web/API/NavigatorID/platform

Use it to extract whatever details you need (and can). Note that there are no guarantees that the client actually uses that platform since this can easily be modified in many ways.

Try it:

console.log(window.navigator.platform);

Solution 5 - Javascript

@Ludwig 's solution was brilliant. A couple of fixes (which didn't have to do with operating system, and I couldn't place as a comment on his original posting because this is too long):

  1. IE 11 no longer identifies itself as MS IE.
  2. Chrome on IOS spoofs itself as Safari

Here they are:

(function (window) {
    {
    /* test cases
        alert(
            'browserInfo result: OS: ' + browserInfo.os +' '+ browserInfo.osVersion + '\n'+
                'Browser: ' + browserInfo.browser +' '+ browserInfo.browserVersion + '\n' +
                'Mobile: ' + browserInfo.mobile + '\n' +
                'Cookies: ' + browserInfo.cookies + '\n' +
                'Screen Size: ' + browserInfo.screen
        );
    */
        var unknown = 'Unknown';

        // screen
        var screenSize = '';
        if (screen.width) {
            width = (screen.width) ? screen.width : '';
            height = (screen.height) ? screen.height : '';
            screenSize += '' + width + " x " + height;
        }

        //browser
        var nVer = navigator.appVersion;
        var nAgt = navigator.userAgent;
        var browser = navigator.appName;
        var version = '' + parseFloat(navigator.appVersion);
        var majorVersion = parseInt(navigator.appVersion, 10);
        var nameOffset, verOffset, ix;

        // Opera
        if ((verOffset = nAgt.indexOf('Opera')) != -1) {
            browser = 'Opera';
            version = nAgt.substring(verOffset + 6);
            if ((verOffset = nAgt.indexOf('Version')) != -1) {
                version = nAgt.substring(verOffset + 8);
            }
        }
        // MSIE
        else if ((verOffset = nAgt.indexOf('MSIE')) != -1) {
            browser = 'Microsoft Internet Explorer';
            version = nAgt.substring(verOffset + 5);
        }

        //IE 11 no longer identifies itself as MS IE, so trap it
        //http://stackoverflow.com/questions/17907445/how-to-detect-ie11
        else if ((browser == 'Netscape') && (nAgt.indexOf('Trident/') != -1)) {

            browser = 'Microsoft Internet Explorer';
            version = nAgt.substring(verOffset + 5);
            if ((verOffset = nAgt.indexOf('rv:')) != -1) {
                version = nAgt.substring(verOffset + 3);
            }

        }

        // Chrome
        else if ((verOffset = nAgt.indexOf('Chrome')) != -1) {
            browser = 'Chrome';
            version = nAgt.substring(verOffset + 7);
        }
        // Safari
        else if ((verOffset = nAgt.indexOf('Safari')) != -1) {
            browser = 'Safari';
            version = nAgt.substring(verOffset + 7);
            if ((verOffset = nAgt.indexOf('Version')) != -1) {
                version = nAgt.substring(verOffset + 8);
            }

            // Chrome on iPad identifies itself as Safari. Actual results do not match what Google claims
            //  at: https://developers.google.com/chrome/mobile/docs/user-agent?hl=ja
            //  No mention of chrome in the user agent string. However it does mention CriOS, which presumably
            //  can be keyed on to detect it.
            if (nAgt.indexOf('CriOS') != -1) {
                //Chrome on iPad spoofing Safari...correct it.
                browser = 'Chrome';
                //Don't believe there is a way to grab the accurate version number, so leaving that for now.
            }
        }
        // Firefox
        else if ((verOffset = nAgt.indexOf('Firefox')) != -1) {
            browser = 'Firefox';
            version = nAgt.substring(verOffset + 8);
        }
        // Other browsers
        else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) < (verOffset = nAgt.lastIndexOf('/'))) {
            browser = nAgt.substring(nameOffset, verOffset);
            version = nAgt.substring(verOffset + 1);
            if (browser.toLowerCase() == browser.toUpperCase()) {
                browser = navigator.appName;
            }
        }
        // trim the version string
        if ((ix = version.indexOf(';')) != -1) version = version.substring(0, ix);
        if ((ix = version.indexOf(' ')) != -1) version = version.substring(0, ix);
        if ((ix = version.indexOf(')')) != -1) version = version.substring(0, ix);

        majorVersion = parseInt('' + version, 10);
        if (isNaN(majorVersion)) {
            version = '' + parseFloat(navigator.appVersion);
            majorVersion = parseInt(navigator.appVersion, 10);
        }

        // mobile version
        var mobile = /Mobile|mini|Fennec|Android|iP(ad|od|hone)/.test(nVer);

        // cookie
        var cookieEnabled = (navigator.cookieEnabled) ? true : false;

        if (typeof navigator.cookieEnabled == 'undefined' && !cookieEnabled) {
            document.cookie = 'testcookie';
            cookieEnabled = (document.cookie.indexOf('testcookie') != -1) ? true : false;
        }

        // system
        var os = unknown;
        var clientStrings = [
            {s:'Windows 3.11', r:/Win16/},
            {s:'Windows 95', r:/(Windows 95|Win95|Windows_95)/},
            {s:'Windows ME', r:/(Win 9x 4.90|Windows ME)/},
            {s:'Windows 98', r:/(Windows 98|Win98)/},
            {s:'Windows CE', r:/Windows CE/},
            {s:'Windows 2000', r:/(Windows NT 5.0|Windows 2000)/},
            {s:'Windows XP', r:/(Windows NT 5.1|Windows XP)/},
            {s:'Windows Server 2003', r:/Windows NT 5.2/},
            {s:'Windows Vista', r:/Windows NT 6.0/},
            {s:'Windows 7', r:/(Windows 7|Windows NT 6.1)/},
            {s:'Windows 8.1', r:/(Windows 8.1|Windows NT 6.3)/},
            {s:'Windows 8', r:/(Windows 8|Windows NT 6.2)/},
            {s:'Windows NT 4.0', r:/(Windows NT 4.0|WinNT4.0|WinNT|Windows NT)/},
            {s:'Windows ME', r:/Windows ME/},
            {s:'Android', r:/Android/},
            {s:'Open BSD', r:/OpenBSD/},
            {s:'Sun OS', r:/SunOS/},
            {s:'Linux', r:/(Linux|X11)/},
            {s:'iOS', r:/(iPhone|iPad|iPod)/},
            {s:'Mac OS X', r:/Mac OS X/},
            {s:'Mac OS', r:/(MacPPC|MacIntel|Mac_PowerPC|Macintosh)/},
            {s:'QNX', r:/QNX/},
            {s:'UNIX', r:/UNIX/},
            {s:'BeOS', r:/BeOS/},
            {s:'OS/2', r:/OS\/2/},
            {s:'Search Bot', r:/(nuhk|Googlebot|Yammybot|Openbot|Slurp|MSNBot|Ask Jeeves\/Teoma|ia_archiver)/}
        ];
        for (var id in clientStrings) {
            var cs = clientStrings[id];
            if (cs.r.test(nAgt)) {
                os = cs.s;
                break;
            }
        }

        var osVersion = unknown;

        if (/Windows/.test(os)) {
            osVersion = /Windows (.*)/.exec(os)[1];
            os = 'Windows';
        }

        switch (os) {
            case 'Mac OS X':
                osVersion = /Mac OS X (10[\.\_\d]+)/.exec(nAgt)[1];
                break;

            case 'Android':
                osVersion = /Android ([\.\_\d]+)/.exec(nAgt)[1];
                break;

            case 'iOS':
                osVersion = /OS (\d+)_(\d+)_?(\d+)?/.exec(nVer);
                osVersion = osVersion[1] + '.' + osVersion[2] + '.' + (osVersion[3] | 0);
                break;

        }
    }

    window.browserInfo = {
        screen: screenSize,
        browser: browser,
        browserVersion: version,
        mobile: mobile,
        os: os,
        osVersion: osVersion,
        cookies: cookieEnabled
    };
}(this));

Solution 6 - Javascript

platform.js seems like a good one file library to do this.

Usage example:

// on IE10 x86 platform preview running in IE7 compatibility mode on Windows 7 64 bit edition
platform.name; // 'IE'
platform.version; // '10.0'
platform.layout; // 'Trident'
platform.os; // 'Windows Server 2008 R2 / 7 x64'
platform.description; // 'IE 10.0 x86 (platform preview; running in IE 7 mode) on Windows Server 2008 R2 / 7 x64'

// or on an iPad
platform.name; // 'Safari'
platform.version; // '5.1'
platform.product; // 'iPad'
platform.manufacturer; // 'Apple'
platform.layout; // 'WebKit'
platform.os; // 'iOS 5.0'
platform.description; // 'Safari 5.1 on Apple iPad (iOS 5.0)'

// or parsing a given UA string
var info = platform.parse('Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7.2; en; rv:2.0) Gecko/20100101 Firefox/4.0 Opera 11.52');
info.name; // 'Opera'
info.version; // '11.52'
info.layout; // 'Presto'
info.os; // 'Mac OS X 10.7.2'
info.description; // 'Opera 11.52 (identifying as Firefox 4.0) on Mac OS X 10.7.2'

Solution 7 - Javascript

You can use this javascript function to check users' OS simply

  function getOS() {
  var userAgent = window.navigator.userAgent,
      platform = window.navigator.platform,
      macosPlatforms = ['Macintosh', 'MacIntel', 'MacPPC', 'Mac68K'],
      windowsPlatforms = ['Win32', 'Win64', 'Windows', 'WinCE'],
      iosPlatforms = ['iPhone', 'iPad', 'iPod'],
      os = null;

  if (macosPlatforms.indexOf(platform) !== -1) {
    os = 'Mac OS';
  } else if (iosPlatforms.indexOf(platform) !== -1) {
    os = 'iOS';
  } else if (windowsPlatforms.indexOf(platform) !== -1) {
    os = 'Windows';
  } else if (/Android/.test(userAgent)) {
    os = 'Android';
  } else if (!os && /Linux/.test(platform)) {
    os = 'Linux';
  }

  return os;
}

alert(getOS());

Solution 8 - Javascript

You can find the OS name and version in the navigator object, as others have answered. The standard, cross-browser place to find this information is in the navigator.userAgent property. However, user agent strings vary widely by OS and browser.

So, I created a script to encapsulate this logic and report on the most common OSes and browsers in a familiar way, like http://www.whatsmybrowser.org.

I open-sourced the script and uploaded it to github, https://github.com/keithws/browser-report. Pull requests are welcome!

Solution 9 - Javascript

Use DetectOS.js. This is a simple JS definition for popular operating systems and browsers without dependencies:

class DetectOS {
    constructor() {
        this.browser = this.searchString(this.dataBrowser())
        this.version = this.searchVersion(navigator.userAgent) || this.searchVersion(navigator.appVersion)
        this.OS = this.searchString(this.dataOS())
    }

    searchString(data) {
        for (let i = 0; i < data.length; i++) {
            let
                dataString = data[i].string,
                dataProp = data[i].prop
            this.versionSearchString = data[i].versionSearch || data[i].identity
            if (dataString) {
                if (dataString.indexOf(data[i].subString) !== -1) {
                    return data[i].identity
                }
            } else if (dataProp) {
                return data[i].identity
            }
        }
    }

    searchVersion(dataString) {
        let index = dataString.indexOf(this.versionSearchString)
        if (index === -1) return
        return parseFloat(dataString.substring(index+this.versionSearchString.length + 1))
    }

    dataBrowser() {
        return [
            /***************
             * Chrome
             ***************/
            {
                string: navigator.userAgent,
                subString: "Chrome",
                identity: "Chrome"
            },
            /***************
             * Safari
             ***************/
            {
                string: navigator.vendor,
                subString: "Apple",
                identity: "Safari",
                versionSearch: "Version"
            },
            /***************
             * For Older Opera (12.18-)
             ***************/
            {
                prop: window.opera,
                identity: "Opera",
                versionSearch: "Version"
            },
            /***************
             * Internet Explorer 10
             ***************/
            {
                string: navigator.userAgent,
                subString: "MSIE",
                identity: "IE10",
                versionSearch: "MSIE"
            },
            /***************
             * Internet Explorer 11
             ***************/
            {
                string: navigator.userAgent,
                subString: "Trident",
                identity: "IE11",
                versionSearch: "rv"
            },
            /***************
             * Edge
             ***************/
            {
                string: navigator.userAgent,
                subString: "Edge",
                identity: "Edge",
                versionSearch: "Edge"
            },
            /***************
             * Firefox
             ***************/
            {
                string: navigator.userAgent,
                subString: "Firefox",
                identity: "Firefox"
            },
            {
                string: navigator.userAgent,
                subString: "Gecko",
                identity: "Mozilla",
                versionSearch: "rv"
            },
            /***************
             * For Older Netscapes (4-)
             ***************/
            {
                string: navigator.userAgent,
                subString: "Mozilla",
                identity: "Netscape",
                versionSearch: "Mozilla"
            },
            /***************
             * For Newer Netscapes (6+)
             ***************/
            {
                string: navigator.userAgent,
                subString: "Netscape",
                identity: "Netscape"
            },
            /***************
             * Other Browsers
             ***************/
            {
                string: navigator.userAgent,
                subString: "OmniWeb",
                versionSearch: "OmniWeb/",
                identity: "OmniWeb"
            },
            {
                string: navigator.vendor,
                subString: "iCab",
                identity: "iCab"
            },
            {
                string: navigator.vendor,
                subString: "KDE",
                identity: "Konqueror"
            },
            {
                string: navigator.vendor,
                subString: "Camino",
                identity: "Camino"
            }
        ]
    }

    dataOS() {
        return [
            {
                string: navigator.platform,
                subString: 'Win',
                identity: 'Windows'
            },
            {
                string: navigator.platform,
                subString: 'Mac',
                identity: 'macOS'
            },
            {
                string: navigator.userAgent,
                subString: 'iPhone',
                identity: 'iOS'
            },
            {
                string: navigator.userAgent,
                subString: 'iPad',
                identity: 'iOS'
            },
            {
                string: navigator.userAgent,
                subString: 'iPod',
                identity: 'iOS'
            },
            {
                string: navigator.userAgent,
                subString: 'Android',
                identity: 'Android'
            },
            {
                string: navigator.platform,
                subString: 'Linux',
                identity: 'Linux'
            }
        ]
    }
}

const Detect = new DetectOS()

console.log("We know your browser – it's " + Detect.browser + " " + Detect.version);
console.log("We know your OS – it's " + Detect.OS);
console.log("We know everything about you.");

Solution 10 - Javascript

If you are creating a website or creating a desktop app with Electron, you may need to get the information of the Operating System the client using. So, in this particular case you can use a global property called window.navigator. If you log the property in the console with console.log(navigator), you will see a whole object of sub-properties that contain the information of the browser, OS, etc.

Again, if you want to create a local NodeJS app it is also possible! Just call the os module with const os = require("os");. then log the constant in the console. You'll get a whole object, but if you want to see the platform name you can type in console.log(os.platform());, and make sure you add a pair of parenthesis after os.platform as platform here is a function!

Hope this helps!

Solution 11 - Javascript

Hey for a quick solution you can consider the following library : UAPARSER - https://www.npmjs.com/package/ua-parser-js

example :

<script type="text/javascript" src="ua-parser.min.js"></script>
<script type="text/javascript">

var parser = new UAParser();
console.log(parser.getOS()) // will log  {name: "", version:""}

you can also install the library via npm, and import it like this:

import { UAParser } from 'ua-parser-js';
let parser = new UAParser();
parser.getOS();

the library is a JS based user agent string parser (window.navigator.userAgent is the user agent on browser) , so you can get with it other details aswell such as Browser,device,engines etc..and it can work with node js as well.

if you need typing for the library : https://www.npmjs.com/package/@types/ua-parser-js

Solution 12 - Javascript

User-Agent strings are not reliable anymore to get the platform information (OS, OS verions, cpu-arch etc.) because it is possible to rewrite them and even the default set by the browser are not accurate. try "console.log(navigator)" in the browser console and check for the User-Agent field.

To address the above problems there's a new W3 proposal (https://wicg.github.io/ua-client-hints/) which will allow user to request specific information about the platform. As of 11/05/2021, only chromium based browsers (Chrome, Edge, Opera, Brave...) have implemented the specifications (the proposal is still unofficial).

One way to get the platform information is for server to request the specific information by adding the header like this 'Accept-CH: Sec-CH-UA-Platform-Version' to the initial response and any subsequent requests from the client would contain the platform information header. For more info see the link above.

To get the information in the client via Javascript the below code can be used (copy and paste it in the chrome console).

let platformDetails = await navigator.userAgentData.getHighEntropyValues(["architecture", 
"platform", "platformVersion", "model", "bitness", "uaFullVersion"]);
console.log(platformDetails);

Solution 13 - Javascript

I've created a library for parsing User Agent strings called Voodoo. But be aware that this should not be used instead of feature detection.

What Voodoo does, is that it parses the userAgent string, which is found in the Navigator object (window.navigator). It's not all browsers that passes a reliable userAgent string, so even though it's the normal way to do it, the userAgent can not always be trusted.

Solution 14 - Javascript

I fork @Ludwig code and remove necessity of swfobject.

I just use swfobject code for detect flash version.

/**
 * JavaScript Client Detection
 * (C) viazenetti GmbH (Christian Ludwig)
 */
(function (window) {
    {
    var unknown = '-';

    // screen
    var screenSize = '';
    if (screen.width) {
        width = (screen.width) ? screen.width : '';
        height = (screen.height) ? screen.height : '';
        screenSize += '' + width + " x " + height;
    }

    //browser
    var nVer = navigator.appVersion;
    var nAgt = navigator.userAgent;
    var browser = navigator.appName;
    var version = '' + parseFloat(navigator.appVersion);
    var majorVersion = parseInt(navigator.appVersion, 10);
    var nameOffset, verOffset, ix;

    // Opera
    if ((verOffset = nAgt.indexOf('Opera')) != -1) {
        browser = 'Opera';
        version = nAgt.substring(verOffset + 6);
        if ((verOffset = nAgt.indexOf('Version')) != -1) {
        version = nAgt.substring(verOffset + 8);
        }
    }
    // MSIE
    else if ((verOffset = nAgt.indexOf('MSIE')) != -1) {
        browser = 'Microsoft Internet Explorer';
        version = nAgt.substring(verOffset + 5);
    }
    // Chrome
    else if ((verOffset = nAgt.indexOf('Chrome')) != -1) {
        browser = 'Chrome';
        version = nAgt.substring(verOffset + 7);
    }
    // Safari
    else if ((verOffset = nAgt.indexOf('Safari')) != -1) {
        browser = 'Safari';
        version = nAgt.substring(verOffset + 7);
        if ((verOffset = nAgt.indexOf('Version')) != -1) {
        version = nAgt.substring(verOffset + 8);
        }
    }
    // Firefox
    else if ((verOffset = nAgt.indexOf('Firefox')) != -1) {
        browser = 'Firefox';
        version = nAgt.substring(verOffset + 8);
    }
    // MSIE 11+
    else if (nAgt.indexOf('Trident/') != -1) {
        browser = 'Microsoft Internet Explorer';
        version = nAgt.substring(nAgt.indexOf('rv:') + 3);
    }
    // Other browsers
    else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) < (verOffset = nAgt.lastIndexOf('/'))) {
        browser = nAgt.substring(nameOffset, verOffset);
        version = nAgt.substring(verOffset + 1);
        if (browser.toLowerCase() == browser.toUpperCase()) {
        browser = navigator.appName;
        }
    }
    // trim the version string
    if ((ix = version.indexOf(';')) != -1) version = version.substring(0, ix);
    if ((ix = version.indexOf(' ')) != -1) version = version.substring(0, ix);
    if ((ix = version.indexOf(')')) != -1) version = version.substring(0, ix);

    majorVersion = parseInt('' + version, 10);
    if (isNaN(majorVersion)) {
        version = '' + parseFloat(navigator.appVersion);
        majorVersion = parseInt(navigator.appVersion, 10);
    }

    // mobile version
    var mobile = /Mobile|mini|Fennec|Android|iP(ad|od|hone)/.test(nVer);

    // cookie
    var cookieEnabled = (navigator.cookieEnabled) ? true : false;

    if (typeof navigator.cookieEnabled == 'undefined' && !cookieEnabled) {
        document.cookie = 'testcookie';
        cookieEnabled = (document.cookie.indexOf('testcookie') != -1) ? true : false;
    }

    // system
    var os = unknown;
    var clientStrings = [
        {s:'Windows 10', r:/(Windows 10.0|Windows NT 10.0)/},
        {s:'Windows 8.1', r:/(Windows 8.1|Windows NT 6.3)/},
        {s:'Windows 8', r:/(Windows 8|Windows NT 6.2)/},
        {s:'Windows 7', r:/(Windows 7|Windows NT 6.1)/},
        {s:'Windows Vista', r:/Windows NT 6.0/},
        {s:'Windows Server 2003', r:/Windows NT 5.2/},
        {s:'Windows XP', r:/(Windows NT 5.1|Windows XP)/},
        {s:'Windows 2000', r:/(Windows NT 5.0|Windows 2000)/},
        {s:'Windows ME', r:/(Win 9x 4.90|Windows ME)/},
        {s:'Windows 98', r:/(Windows 98|Win98)/},
        {s:'Windows 95', r:/(Windows 95|Win95|Windows_95)/},
        {s:'Windows NT 4.0', r:/(Windows NT 4.0|WinNT4.0|WinNT|Windows NT)/},
        {s:'Windows CE', r:/Windows CE/},
        {s:'Windows 3.11', r:/Win16/},
        {s:'Android', r:/Android/},
        {s:'Open BSD', r:/OpenBSD/},
        {s:'Sun OS', r:/SunOS/},
        {s:'Linux', r:/(Linux|X11)/},
        {s:'iOS', r:/(iPhone|iPad|iPod)/},
        {s:'Mac OS X', r:/Mac OS X/},
        {s:'Mac OS', r:/(MacPPC|MacIntel|Mac_PowerPC|Macintosh)/},
        {s:'QNX', r:/QNX/},
        {s:'UNIX', r:/UNIX/},
        {s:'BeOS', r:/BeOS/},
        {s:'OS/2', r:/OS\/2/},
        {s:'Search Bot', r:/(nuhk|Googlebot|Yammybot|Openbot|Slurp|MSNBot|Ask Jeeves\/Teoma|ia_archiver)/}
    ];
    for (var id in clientStrings) {
        var cs = clientStrings[id];
        if (cs.r.test(nAgt)) {
        os = cs.s;
        break;
        }
    }

    var osVersion = unknown;

    if (/Windows/.test(os)) {
        osVersion = /Windows (.*)/.exec(os)[1];
        os = 'Windows';
    }

    switch (os) {
        case 'Mac OS X':
        osVersion = /Mac OS X (10[\.\_\d]+)/.exec(nAgt)[1];
        break;

        case 'Android':
        osVersion = /Android ([\.\_\d]+)/.exec(nAgt)[1];
        break;

        case 'iOS':
        osVersion = /OS (\d+)_(\d+)_?(\d+)?/.exec(nVer);
        osVersion = osVersion[1] + '.' + osVersion[2] + '.' + (osVersion[3] | 0);
        break;
    }
    
    var flashVersion = 'no check', d, fv = [];
    if (typeof navigator.plugins !== 'undefined' && typeof navigator.plugins["Shockwave Flash"] === "object") {
        d = navigator.plugins["Shockwave Flash"].description;
        if (d && !(typeof navigator.mimeTypes !== 'undefined' && navigator.mimeTypes["application/x-shockwave-flash"] && !navigator.mimeTypes["application/x-shockwave-flash"].enabledPlugin)) { // navigator.mimeTypes["application/x-shockwave-flash"].enabledPlugin indicates whether plug-ins are enabled or disabled in Safari 3+
        d = d.replace(/^.*\s+(\S+\s+\S+$)/, "$1");
        fv[0] = parseInt(d.replace(/^(.*)\..*$/, "$1"), 10);
        fv[1] = parseInt(d.replace(/^.*\.(.*)\s.*$/, "$1"), 10);
        fv[2] = /[a-zA-Z]/.test(d) ? parseInt(d.replace(/^.*[a-zA-Z]+(.*)$/, "$1"), 10) : 0;
        }
    } else if (typeof window.ActiveXObject !== 'undefined') {
        try {
        var a = new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
        if (a) { // a will return null when ActiveX is disabled
            d = a.GetVariable("$version");
            if (d) {
            d = d.split(" ")[1].split(",");
            fv = [parseInt(d[0], 10), parseInt(d[1], 10), parseInt(d[2], 10)];
            }
        }
        }
        catch(e) {}
    }
    if (fv.length) {
        flashVersion = fv[0] + '.' + fv[1] + ' r' + fv[2];
    }    
    }

    window.jscd = {
    screen: screenSize,
    browser: browser,
    browserVersion: version,
    mobile: mobile,
    os: os,
    osVersion: osVersion,
    cookies: cookieEnabled,
    flashVersion: flashVersion
    };
}(this));

alert(
    'OS: ' + jscd.os +' '+ jscd.osVersion + '\n'+
    'Browser: ' + jscd.browser +' '+ jscd.browserVersion + '\n' + 
    'Mobile: ' + jscd.mobile + '\n' +
    'Flash: ' + jscd.flashVersion + '\n' +
    'Cookies: ' + jscd.cookies + '\n' +
    'Screen Size: ' + jscd.screen + '\n\n' +
    'Full User Agent: ' + navigator.userAgent
);

Solution 15 - Javascript

I can't comment on @Ian Ippolito answer (because I would have if I had the rep) but according to the document his comment linked, I'm fairly certain you can find the Chrome version for IOS. https://developer.chrome.com/multidevice/user-agent?hl=ja lists the UA as: Mozilla/5.0 (iPhone; CPU iPhone OS 10_3 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) CriOS/56.0.2924.75 Mobile/14E5239e Safari/602.1

So this should work:

if ((verOffset = nAgt.indexOf('CriOS')) != -1) {
                //Chrome on iPad spoofing Safari...correct it.
                browser = 'Chrome';
                version = nAgt.substring(verOffset + 6);//should get the criOS ver.
            }

Haven't been able to test (otherwise I would have improved his answer) it to make sure since my iPad is at home and I'm at work, but I thought I'd put it out there.

Solution 16 - Javascript

I am using this :)

getPlatform() {
    const allPlatforms = ['Win32', 'Win64', 'Windows', 'WinCE', 'Android', 'iPhone', 'iPad', 'iPod'];
    return allPlatforms.find(item => item === navigator.platform);
}

Solution 17 - Javascript

https://developer.mozilla.org/en-US/docs/Web/API/NavigatorUAData/platform

console.log(navigator.userAgentData.platform)

Examples: macOS, Windows

Caution: window.navigator.platform is deprecated

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