Node.js Console

When we say about the Node.js console, this module will provides a simple debugging console same as JavaScript console mechanism provided by web browsers.

And below are the three console methods which are used to write any node.js stream:-

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

(1)Node.js console/log()

We use console.log() function to display simple message on console.

File: console_example.js

console.log('Hello CrackYourInterview');

Now you need to open Node.js command prompt and run the following code to call console_example.js file.

node console_example.js

output brower nodejs

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We can also use format specifier in console.log() function and below is the function and the filename.

File: console_example1.js

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

Now need to open Node.js command prompt and neew to run the below command to execute the file console_example1.js:-

node console_example1.js

SpecifierConsole

(2)Node.js console.error()

Well console.error() function is mainly used to rendor error message on the console.

File: console_example2.js

console.error(new Error('Hi! this is wrong method'));

Now you will open Node.js command prompt and run the follwoing code:

node console_example2.js

Error Console

(3)Node.js console.warn()

Well console.warn() function is mainly used to display warning message on the console.

File: console_example3.js

const name ='Pau';
console.warn('You are not doing well $(name)! so correct your input!');

Now you need to open Node.js command prompt and run the below code:-

node console_example3.js

Error Console