How to check if an object is empty - JavaScript

In this article we will learn how to check if an object is empty in JavaScript.

It is very common to check if an object is empty in JavaScript in JavaScript.

Problem

Now we have a problem which is that we want to check if an object is empty or not.

Now let's imagine that we have an object like this:

const myObject = {
    name: "John",
    age: 30,
    country: "USA"
}

And we want to check if this object is empty or not.

How to solve this problem?

The solution to this problem is easy, but unfortunately there is no built-in function that calculates the number of elements in the object such as an array, so we must convert the object into an array and then use length property.

Solution:

As we said before, we can convert our object to an array and then use length property to get the length of elements.

Let's see an example

// Object
const myObject = {
    name: "John",
    age: 30,
    country: "USA"
}

// Convert to an array
const toArr = Object.entries(myObject);

// Length of elements:
console.log(toArr.length);

Output

3

Create a function

Now we already know the length of the object, and now we will create a function that returns true or false, that function knows if the object is empty or not.

// Create a function
function isEmpty(obj) {

    // Convert to an array
    const toArr = Object.entries(obj);

    // If object is empty
    if (toArr.length === 0) {
        return true;
    }

    // Otherwise
    return false;
}

// Object
const object1 = {
    name: "John",
    age: 30,
    country: "USA"
}

// Object
const object2 = {};

// Tests
console.log(isEmpty(object1));
console.log(isEmpty(object2));

Output

false
true

Thank you for reading

Thank you for reading my blog. 🚀