Here are several prominent libraries that handle browser detection as of May 2019.


### [Bowser][1] 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);



    <script src="https://unpkg.com/bowser@2.4.0/es5.js"></script>



<i>*supports Edge based on Chromium</i>

---

### [Platform.js][2] 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);



    <script src="https://cdnjs.cloudflare.com/ajax/libs/platform/1.3.5/platform.min.js"></script>







### [jQuery Browser][4] 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);



    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-browser/0.1.0/jquery.browser.min.js"></script>






### [Detect.js (Archived)][3] 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);



    <script src="https://cdnjs.cloudflare.com/ajax/libs/Detect.js/2.2.2/detect.min.js"></script>







### [Browser Detect (Archived)][5] by QuirksMode - Last updated Nov 14, 2013 - 884B





    console.log(BrowserDetect)
    document.write("You are using " + BrowserDetect.browser +
                   " v" + BrowserDetect.version + 
                   " on " + BrowserDetect.OS);



    <script src="https://kylemit.github.io/libraries/libraries/BrowserDetect.js"></script>




--- 

## Notable Mentions:

* [WhichBrowser][6] - 1,355★s - Last updated Oct 2, 2018
* [Modernizr][7] - 23,397★s - Last updated Jan 12, 2019 - To feed a fed horse, feature detection should drive any [canIuse][8] 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?][9]
* [**Stack Overflow** - How to detect Safari, Chrome, IE, Firefox and Opera browser?][10]


  [1]: https://github.com/lancedikson/bowser
  [2]: https://github.com/bestiejs/platform.js/
  [3]: https://github.com/darcyclarke/Detect.js
  [4]: https://github.com/gabceb/jquery-browser-plugin
  [5]: https://web.archive.org/web/20131114025336/http://www.quirksmode.org:80/js/detect.html
  [6]: https://github.com/WhichBrowser/Parser-PHP
  [7]: https://github.com/Modernizr/Modernizr
  [8]: https://caniuse.com/
  [9]: https://stackoverflow.com/q/2400935/1366033
  [10]: https://stackoverflow.com/a/49581520/1366033

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?