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How can you detect the version of a browser?

I've been searching around for code that would let me detect if the user visiting the website has Firefox 3 or 4. All I have found is code to detect the type of browser but not the version.

How can I detect the version of a browser like this?

I recommend to setup on a proven library instead of small chunk code: * github.com/bestiejs/platform.js * github.com/ded/bowser both having > 1,000 stars
You can use UAParser JavaScript Library to detect browser and its version. I did it following this How to detect browser, engine, OS, CPU, and device using JavaScript?

C
Community

You can see what the browser says, and use that information for logging or testing multiple browsers.

navigator.sayswho= (function(){ var ua= navigator.userAgent; var tem; var M= ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || []; if(/trident/i.test(M[1])){ tem= /\brv[ :]+(\d+)/g.exec(ua) || []; return 'IE '+(tem[1] || ''); } if(M[1]=== 'Chrome'){ tem= ua.match(/\b(OPR|Edge)\/(\d+)/); if(tem!= null) return tem.slice(1).join(' ').replace('OPR', 'Opera'); } M= M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?']; if((tem= ua.match(/version\/(\d+)/i))!= null) M.splice(1, 1, tem[1]); return M.join(' '); })(); console.log(navigator.sayswho); // outputs: `Chrome 62`

just discovered serious issue downgrading broswer IE11 to IE10 navigatior user agent showing Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E) from string its IE7 with trident/6.0 be careful
It would be helpful if this answer included output examples. I can't tell what strings to expect from the function.
Didn't account for Edge yet: tem = ua.match(/\b(OPR|Edge)\/(\d+)/i); if (tem != null) return {name : tem[1] === 'OPR' ? 'Opera' : tem[1], version : tem[2]};
This script incorrectly reports browser Chrome version 4.0 for the internal Facebook browser (launched when you click web links within the Facebook app on Android). The useragent string looks something like: Mozilla/5.0 (Linux; Android 5.0; Nexus 9 Build/LRX21R; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/45.0.2454.95 Safari/537.36 [FB_IAB/FB4A;FBAV/50.0.0.10.54;] This is a very prominent user agent unfortunately so can't really ignore it...
There are libraries that do this, viz bowser, and as a general rule you shouldn't reinvent the wheel if you don't have to.
m
murb

This is an improvement on Kennebec's answer.

function get_browser() { var ua=navigator.userAgent,tem,M=ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || []; if(/trident/i.test(M[1])){ tem=/\brv[ :]+(\d+)/g.exec(ua) || []; return {name:'IE',version:(tem[1]||'')}; } if(M[1]==='Chrome'){ tem=ua.match(/\bOPR|Edge\/(\d+)/) if(tem!=null) {return {name:'Opera', version:tem[1]};} } M=M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?']; if((tem=ua.match(/version\/(\d+)/i))!=null) {M.splice(1,1,tem[1]);} return { name: M[0], version: M[1] }; } var browser=get_browser(); // browser.name = 'Chrome' // browser.version = '40' console.log(browser);

This way you can shield yourself from the obscurity of the code.

(some platforms - os x for instance - will give a different output for navigator.userAgent and you can't recognise Opera browser by 'Opera' string but instead with 'OPR').
get_browser and get_browser_version return incorrect details inside the 'if trident' and 'if chrome' conditionals if tem!=null
K
KyleMit

Here are several prominent libraries that handle browser detection as of May 2019.

Bowser by lancedikson - 3,761★s - Last updated May 26, 2019 - 4.8KB

var result = bowser.getParser(window.navigator.userAgent); console.log(result); document.write("You are using " + result.parsedResult.browser.name + " v" + result.parsedResult.browser.version + " on " + result.parsedResult.os.name);

*supports Edge based on Chromium

Platform.js by bestiejs - 2,250★s - Last updated Oct 30, 2018 - 5.9KB

console.log(platform); document.write("You are using " + platform.name + " v" + platform.version + " on " + platform.os);

jQuery Browser by gabceb - 504★s - Last updated Nov 23, 2015 - 1.3KB

console.log($.browser) document.write("You are using " + $.browser.name + " v" + $.browser.versionNumber + " on " + $.browser.platform);

Detect.js (Archived) by darcyclarke - 522★s - Last updated Oct 26, 2015 - 2.9KB

var result = detect.parse(navigator.userAgent); console.log(result); document.write("You are using " + result.browser.family + " v" + result.browser.version + " on " + result.os.family);

Browser Detect (Archived) by QuirksMode - Last updated Nov 14, 2013 - 884B

console.log(BrowserDetect) document.write("You are using " + BrowserDetect.browser + " v" + BrowserDetect.version + " on " + BrowserDetect.OS);

Notable Mentions:

WhichBrowser - 1,355★s - Last updated Oct 2, 2018

Modernizr - 23,397★s - Last updated Jan 12, 2019 - To feed a fed horse, feature detection should drive any canIuse style questions. Browser detection is really just for providing customized images, download files, or instructions for individual browsers.

Further Reading

Stack Overflow - Browser detection in JavaScript?

Stack Overflow - How to detect Safari, Chrome, IE, Firefox and Opera browser?

E
Erman Kadir Kahraman

This combines kennebec's (K) answer with Hermann Ingjaldsson's (H) answer:

Maintains original answer's minimal code. (K)

Works with Microsoft Edge (K)

Extends the navigator object instead of creating a new variable/object. (K)

Separates browser version and name into independent child objects. (H)

navigator.browserSpecs = (function(){ var ua = navigator.userAgent, tem, M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || []; if(/trident/i.test(M[1])){ tem = /\brv[ :]+(\d+)/g.exec(ua) || []; return {name:'IE',version:(tem[1] || '')}; } if(M[1]=== 'Chrome'){ tem = ua.match(/\b(OPR|Edge)\/(\d+)/); if(tem != null) return {name:tem[1].replace('OPR', 'Opera'),version:tem[2]}; } M = M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?']; if((tem = ua.match(/version\/(\d+)/i))!= null) M.splice(1, 1, tem[1]); return {name:M[0], version:M[1]}; })(); console.log(navigator.browserSpecs); //Object { name: "Firefox", version: "42" } if (navigator.browserSpecs.name == 'Firefox') { // Do something for Firefox. if (navigator.browserSpecs.version > 42) { // Do something for Firefox versions greater than 42. } } else { // Do something for all other browsers. }

M
Michael Cole

The bowser JavaScript library offers this functionality. 

if (bowser.msie && bowser.version <= 6) {
  alert('Hello China');
}

It seems to be well maintained.

O
Oliver Moran

Use this: http://www.quirksmode.org/js/detect.html 

alert(BrowserDetect.browser); // will say "Firefox"
alert(BrowserDetect.version); // will say "3" or "4"
Outdated reference, no longer supported -"This page used to contain my own browser detect script, but I found that I do not have enough time to keep it up to date. Therefore I removed it."
E
Erman Kadir Kahraman

I was looking for a solution for myself, since jQuery 1.9.1 and above have removed the $.browser functionality. I came up with this little function that works for me. It does need a global variable (I've called mine _browser) in order to check which browser it is. I've written a jsfiddle to illustrate how it can be used, of course it can be expanded for other browsers by just adding a test for _browser.foo, where foo is the name of the browser. I did just the popular ones.

detectBrowser()

_browser = {}; function detectBrowser() { var uagent = navigator.userAgent.toLowerCase(), match = ''; _browser.chrome = /webkit/.test(uagent) && /chrome/.test(uagent) && !/edge/.test(uagent); _browser.firefox = /mozilla/.test(uagent) && /firefox/.test(uagent); _browser.msie = /msie/.test(uagent) || /trident/.test(uagent) || /edge/.test(uagent); _browser.safari = /safari/.test(uagent) && /applewebkit/.test(uagent) && !/chrome/.test(uagent); _browser.opr = /mozilla/.test(uagent) && /applewebkit/.test(uagent) && /chrome/.test(uagent) && /safari/.test(uagent) && /opr/.test(uagent); _browser.version = ''; for (x in _browser) { if (_browser[x]) { match = uagent.match( new RegExp("(" + (x === "msie" ? "msie|edge" : x) + ")( |\/)([0-9]+)") ); if (match) { _browser.version = match[3]; } else { match = uagent.match(new RegExp("rv:([0-9]+)")); _browser.version = match ? match[1] : ""; } break; } } _browser.opera = _browser.opr; delete _browser.opr; } detectBrowser(); console.log(_browser)

To check if the current browser is Opera you would do 

if (_browser.opera) { // Opera specific code }

Edit Fixed the formatting, fixed the detection for IE11 and Opera/Chrome, changed to browserResult from result. Now the order of the _browser keys doesn't matter. Updated jsFiddle link.

2015/08/11 Edit Added new testcase for Internet Explorer 12 (EDGE), fixed a small regexp problem. Updated jsFiddle link.

For new IE Edge(aka Spartan) in Windows 10 it shows that my browser is Chrome 42 --- User agent string: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/42.0.2311.135 safari/537.36 edge/12.10240 The browser is chrome 42
Thanks @Rulisp for your comment and provided sample uagent, since I don't have Edge or Win10. Just going from it I have updated the code in the jsFiddle to reflect that. If you want to test with the sample uagent you gave me just go to this fiddle. Let me know if there is something wrong.
M
Michael Bleidistel 
function BrowserCheck()
{
    var N= navigator.appName, ua= navigator.userAgent, tem;
    var M= ua.match(/(opera|chrome|safari|firefox|msie|trident)\/?\s*(\.?\d+(\.\d+)*)/i);
    if(M && (tem= ua.match(/version\/([\.\d]+)/i))!= null) {M[2]=tem[1];}
    M= M? [M[1], M[2]]: [N, navigator.appVersion,'-?'];
    return M;
}

This will return an array, first element is the browser name, second element is the complete version number in string format.

m
mVChr

In pure Javascript you can do a RegExp match on the navigator.userAgent to find the Firefox version: 

var uMatch = navigator.userAgent.match(/Firefox\/(.*)$/),
    ffVersion;
if (uMatch && uMatch.length > 1) {
    ffVersion = uMatch[1];
}

ffVersion will be undefined if not a Firefox browser.

See working example →

M
Marek

jQuery can handle this quite nice (jQuery.browser) 

var ua = $.browser;
if ( ua.mozilla && ua.version.slice(0,3) == "1.9" ) {
    alert( "Do stuff for firefox 3" );
}

EDIT: As Joshua wrote in his comment below, jQuery.browser property is no longer supported in jQuery since version 1.9 (read jQuery 1.9 release notes for more details). jQuery development team recommends using more complete approach like adapting UI with Modernizr library.

jQuery 1.9 has removed $.browser support, so this is no longer an option.
Joshua - yes, you are right; at least they left jQuery.support property for detecting browser support for certain features (but I'm not sure if this the case of initial question)
Y
YunHan

This is a Update on Fzs2 & kennebec For New Edge Chromium

function get_browser() { var ua=navigator.userAgent,tem,M=ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || []; if(/trident/i.test(M[1])){ tem=/\brv[ :]+(\d+)/g.exec(ua) || []; return {name:'IE',version:(tem[1]||'')}; } if(M[1]==='Chrome'){ tem=ua.match(/\bEdg\/(\d+)/) if(tem!=null) {return {name:'Edge(Chromium)', version:tem[1]};} tem=ua.match(/\bOPR\/(\d+)/) if(tem!=null) {return {name:'Opera', version:tem[1]};} } M=M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?']; if((tem=ua.match(/version\/(\d+)/i))!=null) {M.splice(1,1,tem[1]);} return { name: M[0], version: M[1] }; } var browser=get_browser(); // browser.name = 'Edge(Chromium)' // browser.version = '86' console.log(browser);

R
Ry-

Look at navigator.userAgent - Firefox/xxx.xxx.xxx is specified right at the end.

W
WEFX 
<script type="text/javascript">
var version = navigator.appVersion;
alert(version);
</script>
J
Jez

I wrote a version detector based on Hermann Ingjaldsson's answer, but more robust and which returns an object with name/version data in it. It covers the major browsers but I don't bother with the plethora of mobile ones and minor ones: 

function getBrowserData(nav) {
    var data = {};

    var ua = data.uaString = nav.userAgent;
    var browserMatch = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*([\d\.]+)/i) || [];
    if (browserMatch[1]) { browserMatch[1] = browserMatch[1].toLowerCase(); }
    var operaMatch = browserMatch[1] === 'chrome';
    if (operaMatch) { operaMatch = ua.match(/\bOPR\/([\d\.]+)/); }

    if (/trident/i.test(browserMatch[1])) {
        var msieMatch = /\brv[ :]+([\d\.]+)/g.exec(ua) || [];
        data.name = 'msie';
        data.version = msieMatch[1];
    }
    else if (operaMatch) {
        data.name = 'opera';
        data.version = operaMatch[1];
    }
    else if (browserMatch[1] === 'safari') {
        var safariVersionMatch = ua.match(/version\/([\d\.]+)/i);
        data.name = 'safari';
        data.version = safariVersionMatch[1];
    }
    else {
        data.name = browserMatch[1];
        data.version = browserMatch[2];
    }

    var versionParts = [];
    if (data.version) {
        var versionPartsMatch = data.version.match(/(\d+)/g) || [];
        for (var i=0; i < versionPartsMatch.length; i++) {
            versionParts.push(versionPartsMatch[i]);
        }
        if (versionParts.length > 0) { data.majorVersion = versionParts[0]; }
    }
    data.name = data.name || '(unknown browser name)';
    data.version = {
        full: data.version || '(unknown full browser version)',
        parts: versionParts,
        major: versionParts.length > 0 ? versionParts[0] : '(unknown major browser version)'
    };

    return data;
};

It can then be used like this: 

var brData = getBrowserData(window.navigator || navigator);
console.log('name: ' + brData.name);
console.log('major version: ' + brData.version.major);
// etc.
n
newTag 
var nVer = navigator.appVersion;
var nAgt = navigator.userAgent;
var browserName  = navigator.appName;
var fullVersion  = ''+parseFloat(navigator.appVersion);
var majorVersion = parseInt(navigator.appVersion,10);
var nameOffset,verOffset,ix;

// In Opera, the true version is after "Opera" or after "Version"

if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
 browserName = "Opera";
 fullVersion = nAgt.substring(verOffset+6);
 if ((verOffset=nAgt.indexOf("Version"))!=-1)
   fullVersion = nAgt.substring(verOffset+8);
}
// In MSIE, the true version is after "MSIE" in userAgent

else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
 browserName = "Microsoft Internet Explorer";
 fullVersion = nAgt.substring(verOffset+5);
}
// In Chrome, the true version is after "Chrome"

else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) {
 browserName = "Chrome";
 fullVersion = nAgt.substring(verOffset+7);
}
// In Safari, the true version is after "Safari" or after "Version"

else if ((verOffset=nAgt.indexOf("Safari"))!=-1) {
 browserName = "Safari";
 fullVersion = nAgt.substring(verOffset+7);
 if ((verOffset=nAgt.indexOf("Version"))!=-1)
   fullVersion = nAgt.substring(verOffset+8);
}
// In Firefox, the true version is after "Firefox"

else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) {
 browserName = "Firefox";
 fullVersion = nAgt.substring(verOffset+8);
}
// In most other browsers, "name/version" is at the end of userAgent

else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) <
          (verOffset=nAgt.lastIndexOf('/')) )
{
 browserName = nAgt.substring(nameOffset,verOffset);
 fullVersion = nAgt.substring(verOffset+1);
 if (browserName.toLowerCase()==browserName.toUpperCase()) {
  browserName = navigator.appName;
 }
}

// trim the fullVersion string at semicolon/space if present

if ((ix=fullVersion.indexOf(";"))!=-1)
   fullVersion=fullVersion.substring(0,ix);
if ((ix=fullVersion.indexOf(" "))!=-1)
   fullVersion=fullVersion.substring(0,ix);

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

document.write(''
 +'Browser name  = '+browserName+'<br>'
 +'Full version  = '+fullVersion+'<br>'
 +'Major version = '+majorVersion+'<br>'
 +'navigator.appName = '+navigator.appName+'<br>'
 +'navigator.userAgent = '+navigator.userAgent+'<br>'
)

See the demo here..http://jsfiddle.net/hw4jM/3/

A
Ankit

Detecting Browser and Its version

This code snippet is based on the article from MDN. Where they gave a brief hint about various keywords that can be used to detect the browser name.

https://i.stack.imgur.com/BUfGl.png

I have done few changes to detect browsers like Edge and UCBrowser

getBrowser = () => { const userAgent = navigator.userAgent; let browser = "unkown"; // Detect browser name browser = (/ucbrowser/i).test(userAgent) ? 'UCBrowser' : browser; browser = (/edg/i).test(userAgent) ? 'Edge' : browser; browser = (/googlebot/i).test(userAgent) ? 'GoogleBot' : browser; browser = (/chromium/i).test(userAgent) ? 'Chromium' : browser; browser = (/firefox|fxios/i).test(userAgent) && !(/seamonkey/i).test(userAgent) ? 'Firefox' : browser; browser = (/; msie|trident/i).test(userAgent) && !(/ucbrowser/i).test(userAgent) ? 'IE' : browser; browser = (/chrome|crios/i).test(userAgent) && !(/opr|opera|chromium|edg|ucbrowser|googlebot/i).test(userAgent) ? 'Chrome' : browser;; browser = (/safari/i).test(userAgent) && !(/chromium|edg|ucbrowser|chrome|crios|opr|opera|fxios|firefox/i).test(userAgent) ? 'Safari' : browser; browser = (/opr|opera/i).test(userAgent) ? 'Opera' : browser; // detect browser version switch (browser) { case 'UCBrowser': return `${browser}/${browserVersion(userAgent,/(ucbrowser)\/([\d\.]+)/i)}`; case 'Edge': return `${browser}/${browserVersion(userAgent,/(edge|edga|edgios|edg)\/([\d\.]+)/i)}`; case 'GoogleBot': return `${browser}/${browserVersion(userAgent,/(googlebot)\/([\d\.]+)/i)}`; case 'Chromium': return `${browser}/${browserVersion(userAgent,/(chromium)\/([\d\.]+)/i)}`; case 'Firefox': return `${browser}/${browserVersion(userAgent,/(firefox|fxios)\/([\d\.]+)/i)}`; case 'Chrome': return `${browser}/${browserVersion(userAgent,/(chrome|crios)\/([\d\.]+)/i)}`; case 'Safari': return `${browser}/${browserVersion(userAgent,/(safari)\/([\d\.]+)/i)}`; case 'Opera': return `${browser}/${browserVersion(userAgent,/(opera|opr)\/([\d\.]+)/i)}`; case 'IE': const version = browserVersion(userAgent,/(trident)\/([\d\.]+)/i); // IE version is mapped using trident version // IE/8.0 = Trident/4.0, IE/9.0 = Trident/5.0 return version ? `${browser}/${parseFloat(version) + 4.0}` : `${browser}/7.0`; default: return `unknown/0.0.0.0`; } } browserVersion = (userAgent,regex) => { return userAgent.match(regex) ? userAgent.match(regex)[2] : null; } console.log(getBrowser());

S
Suryanshu Sahay

For this you need to check the value of navigator.appVersion or navigator.userAgent Try using: 

console.log(navigator.appVersion)
P
Pål Sølvberg

I have made a script in ASP code to detect browser, browser version, OS and OS version. The reason for me to do this in ASP was because i want to store the data in a log-database. So I had to detect the browser serverside.

Here is the code: 

on error resume next
ua = lcase(Request.ServerVariables("HTTP_USER_AGENT"))
moz = instr(ua,"mozilla")  
ffx = instr(ua,"firefox")  
saf = instr(ua,"safari")
crm = instr(ua,"chrome") 
max = instr(ua,"maxthon") 
opr = instr(ua,"opera")
ie4 = instr(ua,"msie 4") 
ie5 = instr(ua,"msie 5") 
ie6 = instr(ua,"msie 6") 
ie7 = instr(ua,"msie 7") 
ie8 = instr(ua,"trident/4.0")
ie9 = instr(ua,"trident/5.0")

if moz>0 then 
    BrowserType = "Mozilla"
    BrVer = mid(ua,moz+8,(instr(moz,ua," ")-(moz+8)))
end if
if ffx>0 then 
    BrowserType = "FireFox"
    BrVer = mid(ua,ffx+8)
end if
if saf>0 then 
    BrowserType = "Safari"
    BrVerPlass = instr(ua,"version")
    BrVer = mid(ua,BrVerPlass+8,(instr(BrVerPlass,ua," ")-(BrVerPlass+8)))
end if
if crm>0 then 
    BrowserType = "Chrome"
    BrVer = mid(ua,crm+7,(instr(crm,ua," ")-(crm+7)))
end if
if max>0 then 
    BrowserType = "Maxthon"
    BrVer = mid(ua,max+8,(instr(max,ua," ")-(max+8)))
end if
if opr>0 then 
    BrowserType = "Opera"
    BrVerPlass = instr(ua,"presto")
    BrVer = mid(ua,BrVerPlass+7,(instr(BrVerPlass,ua," ")-(BrVerPlass+7)))
end if
if ie4>0 then 
    BrowserType = "Internet Explorer"
    BrVer = "4"
end if
if ie5>0 then 
    BrowserType = "Internet Explorer"
    BrVer = "5"
end if
if ie6>0 then 
    BrowserType = "Internet Explorer"
    BrVer = "6"
end if
if ie7>0 then 
    BrowserType = "Internet Explorer"
    BrVer = "7"
end if
if ie8>0 then 
    BrowserType = "Internet Explorer"
    BrVer = "8"
    if ie7>0 then BrVer = BrVer & " (in IE7 compability mode)"
end if
if ie9>0 then 
    BrowserType = "Internet Explorer"
    BrVer = "9"
    if ie7>0 then BrVer = BrVer & " (in IE7 compability mode)"
    if ie8>0 then BrVer = BrVer & " (in IE8 compability mode)"
end if

OSSel = mid(ua,instr(ua,"(")+1,(instr(ua,";")-instr(ua,"("))-1)
OSver = mid(ua,instr(ua,";")+1,(instr(ua,")")-instr(ua,";"))-1)

if BrowserType = "Internet Explorer" then
    OSStart = instr(ua,";")
    OSStart = instr(OSStart+1,ua,";")        
    OSStopp = instr(OSStart+1,ua,";")
    OSsel = mid(ua,OSStart+2,(OSStopp-OSStart)-2)
end if

    Select case OSsel
        case "windows nt 6.1"
            OS = "Windows"
            OSver = "7"
        case "windows nt 6.0"
            OS = "Windows"
            OSver = "Vista"
        case "windows nt 5.2"
            OS = "Windows"
            OSver = "Srv 2003 / XP x64"
        case "windows nt 5.1"
            OS = "Windows"
            OSver = "XP"
        case else
            OS = OSSel
    End select

Response.write "<br>" & ua & "<br>" & BrowserType & "<br>" & BrVer & "<br>" & OS & "<br>" & OSver & "<br>"

'Use the variables here for whatever you need........
C
Chazmus

This page seems to have a pretty nice snippet which only uses the appString and appVersion property as a last resort as it claims them to be unreliable with certain browsers. The code on the page is as follows: 

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

// In Opera 15+, the true version is after "OPR/" 
if ((verOffset=nAgt.indexOf("OPR/"))!=-1) {
 browserName = "Opera";
 fullVersion = nAgt.substring(verOffset+4);
}
// In older Opera, the true version is after "Opera" or after "Version"
else if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
 browserName = "Opera";
 fullVersion = nAgt.substring(verOffset+6);
 if ((verOffset=nAgt.indexOf("Version"))!=-1) 
   fullVersion = nAgt.substring(verOffset+8);
}
// In MSIE, the true version is after "MSIE" in userAgent
else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
 browserName = "Microsoft Internet Explorer";
 fullVersion = nAgt.substring(verOffset+5);
}
// In Chrome, the true version is after "Chrome" 
else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) {
 browserName = "Chrome";
 fullVersion = nAgt.substring(verOffset+7);
}
// In Safari, the true version is after "Safari" or after "Version" 
else if ((verOffset=nAgt.indexOf("Safari"))!=-1) {
 browserName = "Safari";
 fullVersion = nAgt.substring(verOffset+7);
 if ((verOffset=nAgt.indexOf("Version"))!=-1) 
   fullVersion = nAgt.substring(verOffset+8);
}
// In Firefox, the true version is after "Firefox" 
else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) {
 browserName = "Firefox";
 fullVersion = nAgt.substring(verOffset+8);
}
// In most other browsers, "name/version" is at the end of userAgent 
else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) < 
          (verOffset=nAgt.lastIndexOf('/')) ) 
{
 browserName = nAgt.substring(nameOffset,verOffset);
 fullVersion = nAgt.substring(verOffset+1);
 if (browserName.toLowerCase()==browserName.toUpperCase()) {
  browserName = navigator.appName;
 }
}
// trim the fullVersion string at semicolon/space if present
if ((ix=fullVersion.indexOf(";"))!=-1)
   fullVersion=fullVersion.substring(0,ix);
if ((ix=fullVersion.indexOf(" "))!=-1)
   fullVersion=fullVersion.substring(0,ix);

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

document.write(''
 +'Browser name  = '+browserName+'<br>'
 +'Full version  = '+fullVersion+'<br>'
 +'Major version = '+majorVersion+'<br>'
 +'navigator.appName = '+navigator.appName+'<br>'
 +'navigator.userAgent = '+navigator.userAgent+'<br>'
)
r
relic

Adding my own implementation of Hermann's answer. I needed OS detection so that's been added. Also includes some ES6 code (because we have a transpiler) that you might need to ES5-ify. 

detectClient() {
    let nav = navigator.appVersion,
        os = 'unknown',
        client = (() => {
            let agent = navigator.userAgent,
                engine = agent.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [],
                build;

            if(/trident/i.test(engine[1])){
                build = /\brv[ :]+(\d+)/g.exec(agent) || [];
                return {browser:'IE', version:(build[1] || '')};
            }

            if(engine[1] === 'Chrome'){
                build = agent.match(/\bOPR\/(\d+)/);

                if(build !== null) {
                    return {browser: 'Opera', version: build[1]};
                }
            }

            engine = engine[2] ? [engine[1], engine[2]] : [navigator.appName, nav, '-?'];

            if((build = agent.match(/version\/(\d+)/i)) !== null) {
                engine.splice(1, 1, build[1]);
            }

            return {
              browser: engine[0],
              version: engine[1]
            };
        })();

    switch (true) {
        case nav.indexOf('Win') > -1:
            os = 'Windows';
        break;
        case nav.indexOf('Mac') > -1:
            os = 'MacOS';
        break;
        case nav.indexOf('X11') > -1:
            os = 'UNIX';
        break;
        case nav.indexOf('Linux') > -1:
            os = 'Linux';
        break;
    }        

    client.os = os;
    return client;
}

Returns: Object {browser: "Chrome", version: "50", os: "UNIX"}

C
Christiyan

I want to share this code I wrote for the issue I had to resolve. It was tested in most of the major browsers and works like a charm, for me!

It may seems that this code is very similar to the other answers but it modifyed so that I can use it insted of the browser object in jquery which missed for me recently, of course it is a combination from the above codes, with little improvements from my part I made: 

(function($, ua){

var M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [],
    tem, 
    res;

if(/trident/i.test(M[1])){
    tem = /\brv[ :]+(\d+)/g.exec(ua) || [];
    res = 'IE ' + (tem[1] || '');
}
else if(M[1] === 'Chrome'){
    tem = ua.match(/\b(OPR|Edge)\/(\d+)/);
    if(tem != null) 
        res = tem.slice(1).join(' ').replace('OPR', 'Opera');
    else
        res = [M[1], M[2]];
}
else {
    M = M[2]? [M[1], M[2]] : [navigator.appName, navigator.appVersion, '-?'];
    if((tem = ua.match(/version\/(\d+)/i)) != null) M = M.splice(1, 1, tem[1]);
    res = M;
}

res = typeof res === 'string'? res.split(' ') : res;

$.browser = {
    name: res[0],
    version: res[1],
    msie: /msie|ie/i.test(res[0]),
    firefox: /firefox/i.test(res[0]),
    opera: /opera/i.test(res[0]),
    chrome: /chrome/i.test(res[0]),
    edge: /edge/i.test(res[0])
}

})(typeof jQuery != 'undefined'? jQuery : window.$, navigator.userAgent);

 console.log($.browser.name, $.browser.version, $.browser.msie); 
// if IE 11 output is: IE 11 true
G
GoharSahi

navigator.sayswho= (function(){ var ua= navigator.userAgent, tem, M= ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || []; if(/trident/i.test(M[1])){ tem= /\brv[ :]+(\d+)/g.exec(ua) || []; return 'IE '+(tem[1] || ''); } if(M[1]=== 'Chrome'){ tem= ua.match(/\b(OPR|Edge)\/(\d+)/); if(tem!= null) return tem.slice(1).join(' ').replace('OPR', 'Opera'); } M= M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?']; if((tem= ua.match(/version\/(\d+)/i))!= null) M.splice(1, 1, tem[1]); return M.join(' '); })(); console.log(navigator.sayswho); // outputs: `Chrome 62`

F
Fabian Montoya

I use this to get de Name and number (int) of the version of the actual browser:

function getInfoBrowser() { var ua = navigator.userAgent, tem, M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || []; if (/trident/i.test(M[1])) { tem = /\brv[ :]+(\d+)/g.exec(ua) || []; return { name: 'Explorer', version: parseInt((tem[1] || '')) }; } if (M[1] === 'Chrome') { tem = ua.match(/\b(OPR|Edge)\/(\d+)/); if (tem != null) { let app = tem.slice(1).toString().split(','); return { name: app[0].replace('OPR', 'Opera'), version: parseInt(app[1]) }; } } M = M[2] ? [M[1], M[2]] : [navigator.appName, navigator.appVersion, '-?']; if ((tem = ua.match(/version\/(\d+)/i)) != null) M.splice(1, 1, tem[1]); return { name: M[0], version: parseInt(M[1]) }; } function getBrowser(){ let info = getInfoBrowser(); $("#i-name").html(info.name); $("#i-version").html(info.version); }

Name:
Version:

This run in

Chrome ; Firefox ; Safari ; Internet Explorer (>= 9) ; Opera ; Edge

For me.

T
Tushar Walzade

For any PWA application using angular you can put the code to check if browser is supported or not in body section of index.html - 

<body>
    <div id="browser"></div>
    <script>
        var operabrowser = true;
        operabrowser = (navigator.userAgent.indexOf('Opera Mini') > -1);
        if (operabrowser) {
            txt = "<p>Browser not supported use different browser...</p>";
            document.getElementById("browser").innerHTML = txt;
        }
    </script>
</body>
B
Binyamin

Here this has better compatibility then @kennebec snippet; will return browser name and version (returns 72 instead of 72.0.3626.96).

Tested on Safari, Chrome, Opera, Firefox, IE, Edge, UCBrowser, also on mobile. 

function browser() {
    var userAgent = navigator.userAgent,
        match = userAgent.match(/(opera|chrome|crios|safari|ucbrowser|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [],
        result = {},
        tem;

    if (/trident/i.test(match[1])) {
        tem = /\brv[ :]+(\d+)/g.exec(userAgent) || [];
        result.name = "Internet Explorer";
    } else if (match[1] === "Chrome") {
        tem = userAgent.match(/\b(OPR|Edge)\/(\d+)/);

        if (tem && tem[1]) {
            result.name = tem[0].indexOf("Edge") === 0 ? "Edge" : "Opera";
        }
    }
    if (!result.name) {
        tem = userAgent.match(/version\/(\d+)/i); // iOS support
        result.name = match[0].replace(/\/.*/, "");

        if (result.name.indexOf("MSIE") === 0) {
            result.name = "Internet Explorer";
        }
        if (userAgent.match("CriOS")) {
            result.name = "Chrome";
        }

    }
    if (tem && tem.length) {
        match[match.length - 1] = tem[tem.length - 1];
    }

    result.version = Number(match[match.length - 1]);

    return result;
}
M
McKayla 
var ua = navigator.userAgent;

if (/Firefox\//.test(ua))
   var Firefox = /Firefox\/([0-9\.A-z]+)/.exec(ua)[1];
M
Marco Allori

I wrote this for my needs.

It get info like if is a mobile device or if has a retina display

try it 

var nav = {
        isMobile:function(){
            return (navigator.userAgent.match(/iPhone|iPad|iPod|Android|BlackBerry|Opera Mini|IEMobile/i) != null);
        },
        isDesktop:function(){
            return (navigator.userAgent.match(/iPhone|iPad|iPod|Android|BlackBerry|Opera Mini|IEMobile/i) == null);
        },
        isAndroid: function() {
            return navigator.userAgent.match(/Android/i);
        },
        isBlackBerry: function() {
            return navigator.userAgent.match(/BlackBerry/i);
        },
        isIOS: function() {
            return navigator.userAgent.match(/iPhone|iPad|iPod/i);
        },
        isOpera: function() {
            return navigator.userAgent.match(/Opera Mini/i);
        },
        isWindows: function() {
            return navigator.userAgent.match(/IEMobile/i);
        },
        isRetina:function(){
            return window.devicePixelRatio && window.devicePixelRatio > 1;
        },
        isIPad:function(){
            isIPad = (/ipad/gi).test(navigator.platform);
            return isIPad;
        },
        isLandscape:function(){
            if(window.innerHeight < window.innerWidth){
                return true;
            }
            return false;
        },
        getIOSVersion:function(){
            if(this.isIOS()){
                var OSVersion = navigator.appVersion.match(/OS (\d+_\d+)/i);
                OSVersion = OSVersion[1] ? +OSVersion[1].replace('_', '.') : 0;
                return OSVersion;
            }
            else
                return false;
        },
        isStandAlone:function(){
            if(_.is(navigator.standalone))
                return navigator.standalone;
            return false;
        },
        isChrome:function(){
            var isChrome = (/Chrome/gi).test(navigator.appVersion);
            var isSafari = (/Safari/gi).test(navigator.appVersion)
            return isChrome && isSafari;
        },
        isSafari:function(){
            var isSafari = (/Safari/gi).test(navigator.appVersion)
            var isChrome = (/Chrome/gi).test(navigator.appVersion)
            return !isChrome && isSafari;
        }
}
Note: Do not rely on navigator.appVersion property to return the correct browser version. It is Deprecated
G
Gaëtan LOISEL

I use this piece of javascript code based on what I could find in another posts.

var browserHelper = function () { var self = {}; /// IE 6+ self.isIEBrowser = function () { return /*@cc_on!@*/false || !!document.documentMode; }; /// Opera 8.0+ self.isOperaBrowser = function () { return (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0; }; /// Firefox 1.0+ self.isFirefoxBrowser = function () { return typeof InstallTrigger !== 'undefined'; }; /// Safari 3.0+ self.isSafariBrowser = function () { return /constructor/i.test(window.HTMLElement) || (function (p) { return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || (typeof safari !== 'undefined' && window['safari'].pushNotification)); }; /// Edge 20+ self.isEdgeBrowser = function () { return !self.isIEBrowser() && !!window.StyleMedia; }; /// Chrome 1 - 87 self.isChromeBrowser = function () { return (!!window.chrome && (!!window.chrome.webstore || !!window.chrome.runtime)) || (navigator.userAgent.indexOf("Chrome") > -1) && !self.isOperaBrowser(); }; /// Edge (based on chromium) self.isEdgeChromiumBrowser = function () { return self.isChromeBrowser() && (navigator.userAgent.indexOf("Edg") != -1); }; /// Blink self.isBlinkBasedOnBrowser = function () { return (self.isChromeBrowser() || self.isOperaBrowser()) && !!window.CSS; }; /// Returns the name of the navigator self.browserName = function () { if (self.isOperaBrowser()) return "Opera"; if (self.isEdgeBrowser()) return "Edge"; if (self.isEdgeChromiumBrowser()) return "Edge (based on chromium)"; if (self.isFirefoxBrowser()) return "Firefox"; if (self.isIEBrowser()) return "Internet Explorer"; if (self.isSafariBrowser()) return "Safari"; if (self.isChromeBrowser()) return "Chrome"; return "Unknown"; }; return self; }; var bName = document.getElementById('browserName'); bName.innerText = browserHelper().browserName(); #browserName { font-family: Arial, Verdana; font-size: 1.2rem; color: #ff8000; text-align: center; border: 2px solid #ff8000; border-radius: .5rem; padding: .5rem; max-width: 25%; margin: auto; }

f
firstlord

For chromium browser is so simple.

Version : navigator.userAgentData.brands[0].version

Browser Name : navigator.userAgentData.brands[0].brand

These are empty for me in Chromium.
Note that this is supported only since chromium 90 (developer.mozilla.org/en-US/docs/Web/API/Navigator/…)
R
Ramya

This got me the version of Firefox, 

    let versionNumber = parseInt(window.navigator.userAgent.match(/Firefox\/([0- 
    9]+)\./)[1]);

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