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On Windows arm64 os.machine() returns unknown #62232
Description
Activity
I wrote a quick powershell script to query various windows apis. Here's the json output:
{ "node": { "platform": "win32", "arch": "arm64", "machine": "unknown", "release": "10.0.26200", "version": "Windows 11 Pro", "cpuModel": "Microsoft SQ3", "cpuCount": 8 }, "nativeApis": { "getSystemInfo": { "wProcessorArchitecture": 12, "processorArchitecture": "ARM64", "wReserved": 0, "dwPageSize": 4096, "lpMinimumApplicationAddress": "0x10000", "lpMaximumApplicationAddress": "0x7FFFFFFEFFFF", "dwActiveProcessorMask": "0xFF", "dwNumberOfProcessors": 8, "dwProcessorType": 0, "dwAllocationGranularity": 65536, "wProcessorLevel": 3403, "wProcessorRevision": 0 }, "getNativeSystemInfo": { "wProcessorArchitecture": 12, "processorArchitecture": "ARM64", "wReserved": 0, "dwPageSize": 4096, "dwNumberOfProcessors": 8, "dwProcessorType": 0, "dwAllocationGranularity": 65536, "wProcessorLevel": 3403, "wProcessorRevision": 0 }, "isWow64Process2": { "available": true, "processMachineCode": 0, "processMachine": "native", "nativeMachineCode": 43620, "nativeMachine": "ARM64" }, "rtlGetVersion": { "ntstatus": 0, "major": 10, "minor": 0, "build": 26200, "platformId": 2, "servicePack": "", "servicePackMajor": 0, "servicePackMinor": 0 }, "getVersionExW": { "success": true, "lastError": 203, "major": 10, "minor": 0, "build": 26200, "platformId": 2, "servicePack": "", "servicePackMajor": 0, "servicePackMinor": 0 }, "environment": { "PROCESSOR_ARCHITECTURE": "ARM64", "PROCESSOR_IDENTIFIER": "ARMv8 (64-bit) Family 8 Model D4B Revision 0, Qualcomm Technologies Inc" } } }Submitted a fix for this in PR #62235. The issue was that Windows ARM64 detection was falling back to 'unknown' in libuv. The fix uses Windows API GetSystemInfo() to properly detect ARM64 when os.machine() would otherwise return 'unknown'.
Reacted by Christopher Addison- added a commit that references this issue
on Mar 12, 2026 This is addressed by #61829.
Reacted by Juan José- linked a pull request that will close this issuedeps: update libuv to 1.52.1 #61829
on Mar 12, 2026
Version
24.14.0
Platform
Subsystem
No response
What steps will reproduce the bug?
You can easily reproduce from command line:
The returned value is
unknownHow often does it reproduce? Is there a required condition?
This happens always on the Windows arm64 version of Node 24.14.0
What is the expected behavior? Why is that the expected behavior?
The
os.machine()should returnarm64like it does on Mac Apple SiliconWhat do you see instead?
os.machine()returnsunknownAdditional information
This is on the native arm64 version of node.
os.arch()correctly returnsarm64