Node.js OS Module
The os module is a built-in module in Node.js. This module provides underlying operating-system related information using various utility functions and properties. This module can be imported simply using require() function.
os.EOL
os.EOL is the end of the line sequence represented by \n on Linux and macOS, and \r\n on Windows.os.constants
os.constants.signals provide all the constants related to handling process signals, like SIGHUP, SIGKILL and etc.
os.constants.errno is used to set the constants related to the error reporting, like EADDRINUSE, EOVERFLOW etc.
os.arch()
This method returns the CPU architecture of the OS such as arm, x64, etc.os.platform()
This method returns information about the operating system's platform.
var os = require('os');
console.log("Platform: " +
os.platform());
console.log("OS Architecture"+os.arch());
/*
Output:
Platform: win32
OS Architecturex64
*/
os.cpus()
This method returns an array having the information about all the CPU in the machine.
var os = require('os');
var arr=os.cpus();
for(item of arr)
{
console.log(item);
}
/*
Output:
{
model: 'Intel(R) Pentium(R) CPU N3540
@ 2.16GHz',
speed: 2167,
times: { user: 898406, nice: 0, sys: 675234, idle: 8626375, irq: 37750 }
}
{
model: 'Intel(R) Pentium(R) CPU N3540
@ 2.16GHz',
speed: 2167,
times: { user: 1102593, nice: 0, sys: 686109, idle: 8410875, irq: 8796 }
}
{
model: 'Intel(R) Pentium(R) CPU N3540
@ 2.16GHz',
speed: 2167,
times: { user: 905421, nice: 0, sys: 612968, idle: 8681187, irq: 7187 }
}
{
model: 'Intel(R) Pentium(R) CPU N3540
@ 2.16GHz',
speed: 2167,
times: { user: 992781, nice: 0, sys: 723421, idle: 8483375, irq: 6265 }
}
*/
os.endiannes()
This method returns the endianness depending on how Node was compiled BE or LE.os.freemem()
This method returns the amount of free memory(bytes) of the systemos.hostname()
This method returns the hostname of the operating systemos.homedir()
This method returns the home directory address
var os = require('os');
console.log(os.endianness());//Endianness
console.log(os.freemem());
//free memory available(bytes)
console.log(os.hostname());//host name
console.log(os.homedir());//home
directory
/*
Output:
LE
376483840
hp
C:\Users\my
*/
os.networkInterfaces()
This method returns the network interfaces that have a network address
var os = require('os');
var ni=os.networkInterfaces();
for(item in ni)
console.log(ni[item]);//network interfaces
/*
Output:
[
{
address: '2401:4900:46a7:8590:55e1:f4d0:3cb8:8969',
netmask: 'ffff:ffff:ffff:ffff::',
family: 'IPv6',
mac: '74:29:af:43:88:a5',
internal: false,
cidr: '2401:4900:46a7:8590:55e1:f4d0:3cb8:8969/64',
scopeid: 0
},
{
address: '2401:4900:46a7:8590:8df7:b298:f4e4:1751',
netmask: 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
family: 'IPv6',
mac: '74:29:af:43:88:a5',
internal: false,
cidr: '2401:4900:46a7:8590:8df7:b298:f4e4:1751/128',
scopeid: 0
},
.
.
.
*/
os.loadavg().
This method returns an array containing the load averages, (1, 5, and 15 minutes) calculated by OS.
var os = require('os');
console.log(os.endianness());//Endianness
console.log(os.freemem()); //free memory available(bytes)
console.log(os.hostname());//host name
console.log(os.homedir());//home directory
/*
Output:
LE
376483840
hp
C:\Users\my
*/
os.release()
This method returns OS's release information.os.tmpdir()
This method returns the operating system's default directory for temporary filesos.totalmem()
This method returns the number of total memory (bytes) of the systemos.type()
This method returns the name of the OSos.uptime()
This method returns the uptime of the OS, in secondsos.userInfo()
This method returns information about the current user
var os = require('os');
var avg=os.loadavg();
console.log("Average load->"+avg.toString());//CPU avg load
console.log("OS release->"+os.release());
console.log("Temp dir->"+os.tmpdir());
console.log("Total memory->"+os.totalmem());
console.log("OS type->"+os.type());
console.log("Uptime->"+os.uptime());
console.log("userInfo->");
console.log(os.userInfo());
/*
Output:
Average
load->0,0,0
OS
release->10.0.18362
Temp
dir->C:\Users\my\AppData\Local\Temp
Total
memory->4175708160
OS
type->Windows_NT
Uptime->14469
userInfo->
{
uid: -1,
gid: -1,
username: 'my',
homedir: 'C:\\Users\\my',
shell: null
}
*/
