Reads the machine's serial number (a.k.a. service/asset tag) or Amazon EC2 instance-id

Serial Number

A simple Node.js module for accessing the serial number (a.k.a. Dell Service Tag, asset tag) of the local machine. Supports Linux, Mac (OS X), Windows, and FreeBSD. On Amazon EC2 instances, it will return the instance-id.

npm install serial-number

And/or install globally for a serial-number shell command: [sudo] npm install -g serial-number

The serial number value is retrieved from the system asynchronously and passed to a callback.

var serialNumber = require('serial-number');
serialNumber(function (errvalue) {

If the serial number turns out to be invalid (common on VMs), the system's UUID value will be provided as a fallback. To instead try to get the UUID on the first attempt, set the preferUUID flag:

serialNumber.preferUUID = true;

To prefix the system command with sudo use the useSudo method:

serialNumber.useSudo(function (errvalue) {

For the CLI command it's just

$ serial-number


$ serial-number --uuid