How to count the number of properties in a JavaScript object
Find out how to calculate how many properties has a JavaScript object
Use the Object.keys() method, passing the object you want to inspect, to get an array of all the (own) enumerable properties of the object.
Then calculate the length of that array by checking the length property:
const car = {
color: 'Blue',
brand: 'Ford',
model: 'Fiesta'
}
Object.keys(car).lengthI said enumerable properties. This means their internal enumerable flag is set to true, which is the default. Check MDN for more info on this subject.
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.