Node.js console.error() Function

The console.error() function from the console class of Node.js is used to display an error message on the console. It prints to stderr with a newline.

Syntax:

console.error([data][, ...args])

Parameter: This function can contain multiple parameters. The first parameter is used for the primary message and other parameters are used for substitution values.

Return Value: The function returns an error message.

The below programs demonstrate the working of the console.error() function:

Program 1:

javascript

// Store number to variable
num = 20

// Check condition
if (num < 100) {
    console.log("Enter number greater than 100");
}
else {
    console.error("correct choice");
}

Output:

Enter number greater than 100

Program 2:

javascript

// Store number to variable
x = 20;
y = 50;

// Check condition
if (x > y) {
    console.error('%d is greater than %d', x, y);
}
else {
    console.error('%d is less than or equal to %d', x, y);
}

Output:

20 is less than or equal to 50