Nodejs OS module provides basic operating-system related utility functions and properties of the computer’s system operating system. You can import this module using the following syntax.
SYNTAX
The syntax to include the Nodejs OS module in your application:
var os = require('os');Nodejs – OS module
Some useful points related to handling files in Nodejs OS module:
- os.EOL gives the line delimiter sequence. It’s \n on Linux and macOS, and \r\n on Windows.
- os.constants.errno sets the constants for error reporting, like EADDRINUSE, EOVERFLOW and more.
MODULE properties and Methods
The Nodejs OS module possesses many properties and uses various methods to provide information related to utility functions.
| S.NO | METHODS | DESCRIPTION |
| 1 | os.tmpdir() | Returns the default directory of an operating system for temp files |
| 2 | constants | Returns an object containing constants of an operating system for process signals, error codes etc. |
| 3 | cpus() | Returns an array containing information about the CPU of the computer |
| 4 | endiannes() | Returns the endianness of the CPU |
| 5 | EOL | Returns the current operating system’s end-of-line marker for |
| 6 | freemem() | Returns the number of free memory of the system |
| 7 | hostname() | Returns the hostname of the operating system |
| 8 | arch() | Returns the operating system CPU architecture |
| 9 | networkInterfaces() | Returns the network interfaces with a network address |
| 10 | platform() | Returns information about the operating system’s platform |
| 11 | release() | Returns information about the operating system’s release |
| 12 | totalmem() | Returns total amount of memory in the system |
| 13 | type() | Returns the operating system’s name |
| 14 | uptime() | Returns the operating system’s uptime, in seconds |
| 15 | userInfo() | Returns the current user’s information |
Advantages:
- It enables users to interact with the operating system.
- And, Provides the hostname of the operating system.
- Then, Returns the free system memory in bytes.
Example 1:
// Include os module and create its object var os = require('os'); // return the cpu architecture console.log("CPU architecture: " + os.arch()); // returns the amount of free system memory in bytes console.log("Free memory: " + os.freemem()); / return total amount of system memory in bytes console.log("Total memory: " + os.totalmem()); // returns the list of network interfaces console.log('List of network Interfaces: ' + os.networkInterfaces()); // returns the operating systems default directory for temp files. console.log('OS default directory for temp files : ' + os.tmpdir ());
Output:
D:\ node>node a.js CPU architecture: x64 Free memory: 1021123448 Total memory: 4198723026 List of network Interfaces: [object Object] OS default directory for temp files : C:\User\Hari\AppData\Local\Temp D: \node>
Read: Node.js – Packages
Example 2:
// Include os module and create its object var os = require('os'); // return the endianness of system console.log("Endianness of system: " + os.endianness()); // returns hostname of system console.log("Hostname: " + os.hostname()); // return operating system name console.log("Operating system name: " + os.type()); // returns the platform of os console.log('operating system platform: ' + os.platform()); // returns the operating systems release. console.log('OS release : ' + os.release());
Output:
D:\node>node a.js Endianess of system: LE Hostname: LAPTOP-E6540 Operating system name: Windows_10 Operating system platform: win64 OS release : 10.0.17134
CONCLUSION
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