How to Check if an Object is Empty in JavaScript

Check if an Object is Empty in JavaScript #

To check if an object is empty in JavaScript:

1. Pass the object to the Object.keys method to get an array of the object's keys
2. Access the length property on the array
3. Check if the length of keys is equal to 0, if it is, then the object is empty

Copied!
const obj = {};

const isEmpty = Object.keys(obj).length === 0;
console.log(isEmpty); // 👉️ true

We used the Object.keys method to get an array of all of the object's keys.

Here's what calling Object.keys on a non-empty object looks like.

Copied!
const obj = {a: 1, b: 2};

console.log(Object.keys(obj)); // 👉️ ['a', 'b']

const isEmpty = Object.keys(obj).length === 0;
console.log(isEmpty); // 👉️ false

Alternatively, you can use a for...in loop.

To check if an object is empty in JavaScript:

1. Use a for...in loop to iterate over the properties of the object.
2. If there is even a single iteration, the object is not empty.
3. If there aren't any iterations, the object is empty.

Copied!
const obj = {};

function isEmpty(object) {
  for (const property in object) {
    return false;
  }
  return true;
}

console.log(isEmpty(obj)); // 👉️ true

We created a helper function which attempts to iterate over the properties of an object.

If there is even 1 iteration, we know that the object has at least 1 key-value pair and is not empty.

If there aren't any iterations, then the object is empty.

Further Reading #

• Check if all Object Properties are Null in JavaScript
• Check if all Values in Object are Equal in JavaScript
• How to Clear an Object in JavaScript
• Remove Empty Objects from an Array in JavaScript
• Check if an Object has a Nested Property in JavaScript
• Check if Array Contains an Object in JavaScript
• Filter an Array of Objects based on a property - JavaScript
• Get the Min/Max Values in an Object in JavaScript
• Get the index of an Object in an Array in JavaScript
• Get an Object's Keys as Array in JavaScript
• Get an Object's Values as Array in JavaScript
• Remove Duplicates from an Array of Objects in JavaScript
• Remove Property from all Objects in Array in JavaScript