Detect the Operating System of User using JavaScript

19 Jul, 2019
The task is detect the operating system of User with the help of JavaScript. we’re going to discuss few techniques.
Approach:
Access the navigator.appVersion or navigator.userAgent property.
Get the index of the OS using indexOf() method.
If index is other than -1, then it is the OS, that we are looking for.
Example 1: In this example, navigator.appVersion property is used to get the OS.
<!DOCTYPE HTML><html>  <head>    <title>        JavaScript       | Detecting the Operating System of User.    </title></head>  <body style="text-align:center;" id="body">    <h1 style="color:green;">              GeeksForGeeks        </h1>    <p id="GFG_UP"       style="font-size: 19px;               font-weight: bold;">    </p>    <button onclick="GFG_Fun()">        click here    </button>    <p id="GFG_DOWN"        style="color: green;               font-size: 24px;               font-weight: bold;">    </p>    <script>        HTMLDocument.prototype.e = document.getElementById;        var el_up = document.e("GFG_UP");        var el_down = document.e("GFG_DOWN");        el_up.innerHTML = "Click on the button to get the OS of User's System.";        var Name = "Not known";        if (navigator.appVersion.indexOf("Win") != -1) Name =           "Windows OS";        if (navigator.appVersion.indexOf("Mac") != -1) Name =           "MacOS";        if (navigator.appVersion.indexOf("X11") != -1) Name =           "UNIX OS";        if (navigator.appVersion.indexOf("Linux") != -1) Name =           "Linux OS";          function GFG_Fun() {            el_down.innerHTML = Name;        }    </script></body>  </html>
Output:
Before clicking on the button:
After clicking on the button:
Example 2: In this example, navigator.userAgent property is used to get the OS.
<!DOCTYPE HTML><html>  <head>    <title>        JavaScript       | Detecting the Operating System of User.    </title></head>  <body style="text-align:center;" id="body">    <h1 style="color:green;">              GeeksForGeeks        </h1>    <p id="GFG_UP"        style="font-size: 19px;              font-weight: bold;">    </p>    <button onclick="GFG_Fun()">        click here    </button>    <p id="GFG_DOWN"        style="color: green;              font-size: 24px;              font-weight: bold;">    </p>    <script>        var el_up = document.getElementById("GFG_UP");        var el_down = document.getElementById("GFG_DOWN");        el_up.innerHTML = "Click on the button to get the OS of User's System.";        var Name = "Unknown OS";        if (navigator.userAgent.indexOf("Win") != -1) Name =           "Windows OS";        if (navigator.userAgent.indexOf("Mac") != -1) Name =           "Macintosh";        if (navigator.userAgent.indexOf("Linux") != -1) Name =           "Linux OS";        if (navigator.userAgent.indexOf("Android") != -1) Name =           "Android OS";        if (navigator.userAgent.indexOf("like Mac") != -1) Name =           "iOS";          function GFG_Fun() {            el_down.innerHTML = Name;        }    </script></body>  </html>
Output:
Before clicking on the button:
After clicking on the button:
JavaScript-Misc
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