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How to detect operating system on the client machine using JavaScript ?
  • Difficulty Level : Basic
  • Last Updated : 16 Aug, 2019

To detect the operating system on the client machine, one can simply use navigator.appVersion or navigator.userAgent property.
The Navigator appVersion property is a read-only property and it returns a string which represents the version information of the browser.

Syntax

navigator.appVersion

Example 1: This example uses navigator.appVersion property to display the operating system name.




<!DOCTYPE html> 
<html
  
<head
    <title>
        How to detect operating system on the
        client machine using JavaScript ?
    </title>
</head
  
<body style="text-align:center;"
  
    <h1 style="color:green;">GeeksforGeeks</h1
  
    <button ondblclick="operatingSytem()"
        Return Operating System Name 
    </button
  
    <p id="OS"></p
      
    <!-- Script to display the OS name -->
    <script
        function operatingSytem() { 
            var OSName="Unknown OS";
            if (navigator.appVersion.indexOf("Win")!=-1) OSName="Windows";
            if (navigator.appVersion.indexOf("Mac")!=-1) OSName="MacOS";
            if (navigator.appVersion.indexOf("X11")!=-1) OSName="UNIX";
            if (navigator.appVersion.indexOf("Linux")!=-1) OSName="Linux";
              
            // Display the OS name
            document.getElementById("OS").innerHTML = OSName;
        
    </script
  
</body
  
</html>

Output:

  • Before Click on the Button:
  • After Click on the Button:

Example 2: This example uses navigator.appVersion property to display all the properties of the client machine.




<!DOCTYPE html> 
<html
  
<head
    <title>
        How to detect operating system on the
        client machine using JavaScript ?
    </title>
</head
  
<body style="text-align:center;"
  
    <h1 style="color:green;">GeeksforGeeks</h1>
  
    <button ondblclick="version()"
        Return OS Version 
    </button
  
    <p id="OS"></p
      
    <!-- Script to return OS details -->
    <script
        function version() { 
            var os = navigator.appVersion; 
              
            // Display the OS details
            document.getElementById("OS").innerHTML = os; 
        
    </script
</body
  
</html>                 

Output:

  • Before Click on the Button:
  • After Click on the Button:



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