Detect CPU architecture (not process architecture).
Handles emulation scenarios where process.arch returns the wrong value:
x64arm64arm64npm install cpu-arch
const cpuArch = require('cpu-arch');
console.log(cpuArch());
// => 'x64', 'arm64', 'ia32', 'arm', etc.
process.arch?process.arch returns the architecture of the Node.js binary, not the CPU:
| Scenario | process.arch | cpuArch() |
|---|---|---|
| 32-bit Node on 64-bit Windows | ia32 | x64 |
| x64 Node on Apple Silicon (Rosetta) | x64 | arm64 |
| Native arm64 Node on Apple Silicon | arm64 | arm64 |
This matters when selecting native binaries (e.g., @swc/core, Node.js downloads).
| Value | Description |
|---|---|
x64 | 64-bit Intel/AMD |
arm64 | 64-bit ARM (Apple Silicon, ARM64 Windows/Linux) |
ia32 | 32-bit Intel/AMD |
arm | 32-bit ARM |
ia64 | Intel Itanium |
| Other | Raw uname -m output (ppc64, s390x, etc.) |
| Platform | Method |
|---|---|
| Windows | PROCESSOR_ARCHITEW6432 / PROCESSOR_ARCHITECTURE env vars |
| macOS | sysctl -in sysctl.proc_translated for Rosetta detection |
| Linux | uname -m |
MIT
FAQs
Detect CPU architecture (handles WoW64, Rosetta 2, ARM64)
The npm package cpu-arch receives a total of 66 weekly downloads. As such, cpu-arch popularity was classified as not popular.
We found that cpu-arch demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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