Node.js Util

Node.js has a built-in module called util that provides utility functions for various purposes, such as debugging and formatting data. In this tutorial, we will discuss how to use the util module in Node.js.

Syntax

The basic syntax for using the util module in Node.js is as follows:

const util = require('util');

This code imports the util module and allows you to use its functions in your Node.js application.

Example

Here is an example of using the util module to format data in Node.js:

const util = require('util');

const myObject = {
  name: "John",
  age: 30,
  city: "New York"
};

const formattedOutput = util.format("My name is %s, I'm %d years old and I live in %s.", myObject.name, myObject.age, myObject.city);

console.log(formattedOutput);

Output:

My name is John, I'm 30 years old and I live in New York.

Explanation

In the example above, we imported the util module, created an object called myObject, and used the util.format function to create a formatted string that includes data from the myObject object. We then printed the formatted output to the console using console.log().

Use

The util module in Node.js provides utility functions that can be used for various purposes, including:

• Formatting output
• Debugging with verbose logging
• Creating custom error classes
• Handling events
• Converting callbacks to promises
• Inspecting objects and functions

Important Points

• The util module is a built-in module in Node.js, so you don't need to install it separately.
• The util module has many useful functions that can simplify your code and improve its readability.

Summary

In this tutorial, we discussed how to use the util module in Node.js. We covered its syntax, example, output, explanation, use, and important points. With this knowledge, you can use the functions provided by the util module to simplify your code and improve its readability.