object is empty in javascript

How to Check if an Object is Empty in Javascript or Typescript?

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In this article, we will learn to check if the object is empty in Javascript.  There are multiple ways to find it out. We are going explore every way in this article.

Different Ways to check if the Object is Empty in Javascript or Typescript

1. Using Object.keys() Method

Sample Code

const obj = {};
const isEmpty = Object.keys(obj).length === 0; // true

In the above method, we are checking for the enumerable property names in the object using the Object.keys() method and getting its length. The object is not empty if its length is more than 1.

2. Using Object.values() Method

Sample Code

const isEmptyValues = Object.values(obj).length === 0; // true

Object.values() method returns an array of the object’s own enumerable property values.

3. Using Object.entries() Method

Sample Code

const isEmptyEntries = Object.entries(obj).length === 0; // true

Object.entries() method returns an array of key-value pairs from the object.

4. Using For…in Loop with hasOwnProperty() Method

Sample Code

function isEmpty(obj) {
  for (const prop in obj) {
    if (obj.hasOwnProperty(prop)) {
      return false;
    }
  }
  return true;
}

The hasOwnProperty() method ensures checking only owned properties and not the inherited ones.

5. Using JSON.stringify() Method

Sample Code

const isEmpty = JSON.stringify(obj) === '{}'; // true

In the above method, we are converting the Object to string comparing it with the stringified empty braces ‘{}’ which returns true if the object matches with it.

6. Using Libraries

Few libraries have dedicated methods to find out whether the object is empty.

a. Using Jquery

Sample Code

// jQuery
const isEmpty = $.isEmptyObject(obj);

In Jquery, we have isEmptyObject() method which tells us whether the object is empty or not.

b. Using Lodash

Sample Code

// Lodash
const isEmpty = _.isEmpty(obj);

In Lodash, we have isEmpty() method to determine whether the object is empty.

Among all the methods mentioned above, Object.keys() is generally efficient and widely supported. And if we don’t want to write a separate method for it and if we can use libraries, using Lodash library can be reliable choice for these kind of tasks.

 

 

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