Question

To do this in any ES5-compatible environment, such as Node, Chrome, IE 9+, Firefox 4+, or Safari 5+:

Object.keys(obj).length

• Browser compatibility
• Object.keys documentation (includes a method you can add to non-ES5 browsers)

Answer 1

var obj = { name: '나눔팁', homepage: 'https://www.nanumtip.com/' };
var count = Object.keys(obj).length;
console.log('object key 개수', count);