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

snippet
console.log('Hello JavaTpoint');

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

snippet
node console_example1.js
Node.js console example 1

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

File: console_example2.js

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

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

snippet
node console_example2.js
Node.js console example 2

Node.js console.error()

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

File: console_example3.js

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

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

snippet
node console_example3.js
Node.js console example 3

Node.js console.warn()

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

File: console_example4.js

snippet
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:

snippet
node console_example4.js
Node.js console example 4
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