Node.js process.uptime() Method

The process.uptime() method is an inbuilt application programming interface of the process module which is used to get the number of seconds the Node.js process is running.

Syntax:

process.uptime();

Parameters: This method does not accept any parameter.

Return Value: It returns a floating-point number specifying the number of seconds the Node.js process is running.

Below examples illustrate the use of process.uptime() method in Node.js:

Example 1:

// Node.js program to demonstrate the
// process.uptime() Method

// Allocating process module
const process = require('process');

// Printing the number of seconds
// the Node.js process is running
console.log(process.uptime());

Output:

0.0842063

Example 2:

// Node.js program to demonstrate the
// process.uptime() Method

// Allocating process module
const process = require('process');

// Checking whether the method
// exists or not
if (process.uptime) {

    // Printing uptime() value
    console.log("The number of seconds the"
          + " Node.js process is running: "
          + process.uptime() + " seconds");

    var i = 1000000;

    while(i--);

    console.log("The number of seconds the"
          + " Node.js process is running: "
          + process.uptime() + " seconds");

    console.log("In whole seconds: "
          + Math.floor(process.uptime())
          + " seconds");
}

Output:

the number of seconds the Node.js process is running: 0.077 seconds
the number of seconds the Node.js process is running: 0.087 seconds
In whole seconds: 0 seconds

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

Reference: https://nodejs.org/api/process.html#process_process_uptime