Node.js os.loadavg() Method

The os.loadavg() method is an inbuilt application programming interface of the os module which is used to get the load average. Load average is a measure of system activity, expressed in a fractional number, calculated by the operating system. 

Syntax:

os.loadavg()

Parameters: This method does not accept any parameters.

Return Value: This method returns an array containing a fractional number of size three signifies 1, 5, and 15 minutes load average calculated by the operating system. On Windows, it will return [0, 0, 0] as the load average is a Unix-Specific concept. 

Example 1: The below example illustrates the use of the os.loadavg() method in Node.js:

javascript

// Node.js program to demonstrate the
// os.loadavg() method

// Run in Linux system
// Require os module
const os = require('os');

// Printing os.loadavg() value
console.log(os.loadavg());

Output:

[ 13.42041015625, 12.95166015625, 12.72509765625 ]

Example 2: The below example illustrates the use of the os.loadavg() method in Node.js:

javascript

// Node.js program to demonstrate the
// os.loadavg() method

// Run on Windows system
// Require os module
const os = require('os');

// Printing os.loadavg() value
console.log(os.loadavg());

Output:

[ 0, 0, 0 ]

Example 3: The below example illustrates the use of os.loadavg() method in Node.js:

javascript

// Node.js program to demonstrate the
// os.loadavg() method

// Require os module
const os = require('os');

// Printing os.loadavg() value
let avg_load = os.loadavg();

console.log("Load average (1 minute):"
    + String(avg_load[0]));

console.log("Load average (5 minute):"
    + String(avg_load[1]));

console.log("Load average (15 minute):"
    + String(avg_load[2]));

Output:

Load average (1 minute):15.87158203125
Load average (5 minute):14.193359375
Load average (15 minute):13.365234375

Note: The above program will compile and run by using the node index.js command. 

Reference: https://nodejs.org/api/os.html#os_os_loadavg