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On Windows arm64 os.machine() returns unknown #62232
Description
Version
24.14.0
Platform
Microsoft Windows NT 10.0.26200.0 arm64
Subsystem
No response
What steps will reproduce the bug?
You can easily reproduce from command line:
node -e "console.log(os.machine())"
The returned value is unknown
How 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 return arm64 like it does on Mac Apple Silicon
What do you see instead?
os.machine() returns unknown
Additional information
This is on the native arm64 version of node. os.arch() correctly returns arm64
Activity
chris-addison commentedon Mar 12, 2026
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" } } }zakiscoding commentedon Mar 12, 2026
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'.
fix(os): return 'arm64' from os.machine() on Windows ARM64 (fix nodej…
Renegade334 commentedon Mar 12, 2026
This is addressed by #61829.
chaiphetwongchaiyatham0-ohmk commentedon Mar 21, 2026
khalidsaidi commentedon Mar 25, 2026