Javascript Reference - Navigator userAgent Property

The userAgent property returns the value of the user-agent header sent by the browser to the server.

The value contains information about the name, version and platform of the browser.

Browser Support


`userAgent`	Yes	Yes	Yes	Yes	Yes

Syntax

var v = navigator.userAgent

Return Value

Type	Description
String	The user agent string for the current browser

Example

A demonstration of all navigator properties.


<!DOCTYPE html>
<html>
<body>
<!--from w w w.j a va  2s . c o  m-->
<div id="demo"></div>

<script>
txt = "<p>Browser CodeName: " + navigator.appCodeName + "</p>";
txt+= "<p>Browser Name: " + navigator.appName + "</p>";
txt+= "<p>Browser Version: " + navigator.appVersion + "</p>";
txt+= "<p>Cookies Enabled: " + navigator.cookieEnabled + "</p>";
txt+= "<p>Browser Language: " + navigator.language + "</p>";
txt+= "<p>Browser Online: " + navigator.onLine + "</p>";
txt+= "<p>Platform: " + navigator.platform + "</p>";
txt+= "<p>User-agent header: " + navigator.userAgent + "</p>";
txt+= "<p>User-agent language: " + navigator.systemLanguage + "</p>";

document.getElementById("demo").innerHTML = txt;
</script>

</body>
</html>

The code above is rendered as follows:

Example 2

The following code shows how to get the user-agent header sent by your browser.


<!DOCTYPE html>
<html>
<body>
<button onclick="myFunction()">test</button>
<p id="demo"></p>
<script>
function myFunction() {<!--   w  w w.jav a 2s . c o m-->
    var x = "User-agent header sent: " + navigator.userAgent;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>

The code above is rendered as follows: