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 all the keys of the object
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

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// Supported in IE 9-11
const obj = {};

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

In the code example, we used the Object.keys method to get an array of all of the keys of the object.

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

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

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

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

An alternative approach is to try to iterate over the properties of the object. If there is even a single iteration, then the object is not empty.

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// Supported in IE 6-11
const obj = {};

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

console.log(isEmpty(obj)); // 👉️ true

In the code snippet, we have 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 an empty object.

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