How to Detect Operating System on the Client Machine using JavaScript? Last Updated : 12 Jul, 2025 Comments Improve Suggest changes Like Article Like Report To detect the operating system on the client machine, one can simply use navigator.appVersion property. The Navigator appVersion property is a read-only property and it returns a string that represents the version information of the browser. Syntax:navigator.appVersionExample 1: This example uses the navigator.appVersion property to display the operating system name. html <!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() { let 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: Example 2: This example uses the navigator.appVersion property to display all the properties of the client machine. html <!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 onclick="version()"> Return OS Version </button> <p id="OS"></p> <!-- Script to return OS details --> <script> function version() { let os = navigator.appVersion; // Display the OS details document.getElementById("OS").innerHTML = os; } </script> </body> </html> Output: Comment More info A abhishek7 Follow Improve Article Tags : JavaScript Web Technologies JavaScript-Questions Explore JavaScript BasicsIntroduction to JavaScript4 min readVariables and Datatypes in JavaScript6 min readJavaScript Operators5 min readControl Statements in JavaScript4 min readArray & StringJavaScript Arrays7 min readJavaScript Array Methods7 min readJavaScript Strings6 min readJavaScript String Methods9 min readFunction & ObjectFunctions in JavaScript5 min readJavaScript Function Expression3 min readFunction Overloading in JavaScript4 min readObjects in Javascript4 min readJavaScript Object Constructors4 min readOOPObject Oriented Programming in JavaScript3 min readClasses and Objects in JavaScript4 min readWhat Are Access Modifiers In JavaScript ?5 min readJavaScript Constructor Method7 min readAsynchronous JavaScriptAsynchronous JavaScript2 min readJavaScript Callbacks4 min readJavaScript Promise4 min readEvent Loop in JavaScript4 min readAsync and Await in JavaScript2 min readException HandlingJavascript Error and Exceptional Handling6 min readJavaScript Errors Throw and Try to Catch2 min readHow to create custom errors in JavaScript ?2 min readJavaScript TypeError - Invalid Array.prototype.sort argument1 min readDOMHTML DOM (Document Object Model)9 min readHow to select DOM Elements in JavaScript ?3 min readJavaScript Custom Events4 min readJavaScript addEventListener() with Examples9 min readAdvanced TopicsClosure in JavaScript4 min readJavaScript Hoisting6 min readJavascript Scope3 min readJavaScript Higher Order Functions7 min readDebugging in JavaScript4 min read Like