OS Module

Node.js os module provides a few basic operating-system related utility functions. This module can be imported using following syntax.

var os = require("os")


S.N.method & Description
1 os.tmpdir()
Returns the operating system's default directory for temp files.
2 os.endianness()
Returns the endianness of the CPU. Possible values are "BE" or "LE".
3 os.hostname()
Returns the hostname of the operating system.
4 os.type()
Returns the operating system name.
5 os.platform()
Returns the operating system platform.
6 os.arch()
Returns the operating system CPU architecture. Possible values are "x64", "arm" and "ia32".
7 os.release()
Returns the operating system release.
8 os.uptime()
Returns the system uptime in seconds.
9 os.loadavg()
Returns an array containing the 1, 5, and 15 minute load averages.
10 os.totalmem()
Returns the total amount of system memory in bytes.
11 os.freemem()
Returns the amount of free system memory in bytes.
12 os.cpus()
Returns an array of objects containing information about each CPU/core installed: model, speed (in MHz), and times (an object containing the number of milliseconds the CPU/core spent in: user, nice, sys, idle, and irq).
13 os.networkInterfaces()
Get a list of network interfaces.


S. N.Property & Description
1 os.EOL
A constant defining the appropriate End-of-line marker for the operating system.


Create a js file named main.js in which demonstrate few of the OS methods.

var os = require("os");

// Endianness
console.log('endianness : ' + os.endianness());

// OS type
console.log('type : ' + os.type());

// OS platform
console.log('platform : ' + os.platform());

// Total system memory
console.log('total memory : ' + os.totalmem() + " bytes.");

// Total free memory
console.log('free memory : ' + os.freemem() + " bytes.");

Now run the main.js to see the result:

$ node main.js

Verify the Output.

endianness : LE
type : Linux
platform : linux
total memory : 25103400960 bytes.
free memory : 20676710400 bytes.