How to check if an object is empty in JavaScript

Sep 10, 2019

Learn how to check if an object is empty in JavaScript using Object.entries().length and a constructor check, plus the Lodash isEmpty() shortcut.

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Say you want to check if a value you have is equal to the empty object, which can be created using the object literal syntax:

const emptyObject = {}

How can you do so?

Use the Object.entries() function.

It returns an array containing the object’s enumerable properties.

It’s used like this:

Object.entries(objectToCheck)

If it returns an empty array, it means the object does not have any enumerable property, which in turn means it is empty.

Object.entries(objectToCheck).length === 0

You should also make sure the object is actually an object, by checking its constructor is the Object object:

objectToCheck.constructor === Object

Lodash, a popular library, makes it simpler by providing the isEmpty() function:

_.isEmpty(objectToCheck)

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