How to check if an object is empty in JavaScript
Find out how to see if a variable is equivalent to an empty object
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 === 0You should also make sure the object is actually an object, by checking its constructor is the Object object:
objectToCheck.constructor === ObjectLodash, a popular library, makes it simpler by providing the isEmpty() function:
_.isEmpty(objectToCheck)download all my books for free
- javascript handbook
- typescript handbook
- css handbook
- node.js handbook
- astro handbook
- html handbook
- next.js pages router handbook
- alpine.js handbook
- htmx handbook
- react handbook
- sql handbook
- git cheat sheet
- laravel handbook
- express handbook
- swift handbook
- go handbook
- php handbook
- python handbook
- cli handbook
- c handbook
subscribe to my newsletter to get them
Terms: by subscribing to the newsletter you agree the following terms and conditions and privacy policy. The aim of the newsletter is to keep you up to date about new tutorials, new book releases or courses organized by Flavio. If you wish to unsubscribe from the newsletter, you can click the unsubscribe link that's present at the bottom of each email, anytime. I will not communicate/spread/publish or otherwise give away your address. Your email address is the only personal information collected, and it's only collected for the primary purpose of keeping you informed through the newsletter. It's stored in a secure server based in the EU. You can contact Flavio by emailing flavio@flaviocopes.com. These terms and conditions are governed by the laws in force in Italy and you unconditionally submit to the jurisdiction of the courts of Italy.