Node.js console.profileEnd() Method

Last Updated : 09 Sep, 2020

The console module provides a simple debugging console that is provided by web browsers which export two specific components:

Console class can be used to write to any Node.js stream. Example: console.log(), console.error(), etc.
A global console can be used without importing console. Example: process.stdout, process.stderr, etc.

The console.profileEnd() (Added in v8.0.0) method is an inbuilt application programming interface of the ‘console’ module which does not display anything unless used in the inspector. It actually stops the current JavaScript CPU profiling session if one has been started and prints the report to the Profiles panel of the inspector and if this method is called without a label, the most recently started profile is stopped.

Note: The global console methods are neither consistently synchronous nor consistently asynchronous.

Syntax:

console.profileEnd([label])

Parameters: This function accepts a single parameter as mentioned above and described below:

label <string>: It accepts the label name that is further to be used in the inspector.

Return Value: It doesn’t print anything in console instead, finishes/Ends a JavaScript CPU profile in Inspector.

The Below examples illustrate the use of console.profileEnd() method in Node.js.

Example 1: Filename: index.js

// Node.js program to demonstrate the 
// console.profileEnd() Method 
  
// Starting MyLabel console profile 
console.profile('MyLabel'); 
  
// Doing some task 
for (var i = 0; i < 4; i++) { 
 // Printing some task 
 console.log('Doing task no:', i); 
} 
  
// Finishing MyLabel profile 
console.profileEnd('MyLabel'); 

Run index.js file using the following command:

node index.js

Output in Console:

Doing task no: 0
Doing task no: 1
Doing task no: 2
Doing task no: 3

Output in Inspector:

Output In Inspector

Example 2: Filename: index.js

// Node.js program to demonstrate the 
// console.profileEnd() Method 
  
// New profile function 
function newProfile(callback) {       
 try{ 
     // Do some task 
     for(var i = 1; i < 4; i++) { 
     console.log('Working on task:', i); 
     callback();       
     } 
   } catch { 
     // Prints if there is error 
     console.error('error occured'); 
   } 
} 
  
// Starting newProfile() console profile 
console.profile("newProfile()"); 
  
// Calling newprofile() 
newProfile(function alfa() { 
  // Finishing profile 
  console.profileEnd(); 
}); 

Run index.js file using the following command:

node index.js

Output in Console:

Working on task: 1
Working on task: 2
Working on task: 3

Output in Inspector:

Output In Inspector

Reference: https://nodejs.org/api/console.html#console_console_profileend_label

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