Node.js Console

The Node.js console module provides a simple debugging console similar to JavaScript console mechanism provided by web browsers.

There are three console methods that are used to write any node.js stream:

  1. console.log()
  2. console.error()
  3. console.warn()

Node.js console.log()

The console.log() function is used to display simple message on console.

File: console_example1.js

console.log('Hello JavaTpoint');

Open Node.js command prompt and run the following code:

node console_example1.js

nodejs-console-example1-(1).jpg

We can also use format specifier in console.log() function.

File: console_example2.js

console.log('Hello %s', 'JavaTpoint');

Open Node.js command prompt and run the following code:

node console_example2.js

nodejs-console-example2.jpg

Node.js console.error()

The console.error() function is used to render error message on console.

File: console_example3.js

console.error(new Error('Hell! This is a wrong method.'));  

Open Node.js command prompt and run the following code:

node console_example3.js  

nodejs-console-example3.jpg

Node.js console.warn()

The console.warn() function is used to display warning message on console.

File: console_example4.js

const name = 'John';  
console.warn(`Don't mess with me ${name}! Don't mess with me!`);

Open Node.js command prompt and run the following code:

node console_example4.js  

nodejs-console-example4.jpg

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