The Navigator.oscpu property returns a string that identifies the current operating system.


oscpuInfo = navigator.oscpu


A DOMString providing a string which identifies the operating system on which the browser is running.

Operating system oscpuInfo string format
OS/2 OS/2 Warp x (either 3, 4 or 4.5)
Windows CE WindowsCE x.y1
Windows 64-bit (64-bit build) Windows NT x.y; Win64; x64
Windows 64-bit (32-bit build) Windows NT x.y; WOW64
Windows 32-bit Windows NT x.y
Mac OS X (PPC build) PowerPC Mac OS X version x.y
Mac OS X (i386/x64 build) Intel Mac OS X or macOS version x.y
Linux 64-bit (32-bit build) Output of uname -s plus i686 on x86_64
Linux Output of uname -sm
  1. x.y refers to the version of the operating system


function osInfo() {

osInfo(); // alerts "Windows NT 6.0" for example

Usage notes

Unless your code is privileged (chrome or at least has the UniversalBrowserRead privilege), it may get the value of the general.oscpu.override preference instead of the true platform.


Specification Status Comment
HTML Living Standard
The definition of 'NavigatorID: oscpu' in that specification.
Living Standard Initial definition

Browser compatibility

BCD tables only load in the browser