How to Check an Object is Empty using JavaScript?

These are the following ways that can be used to Check an Object is Empty using JavaScript:

1. Using Object.keys() Method - Mostly used

The Object.keys() method returns an array that contains the property names of an object. If the length of array is 0, then object is empty.

let obj = {};
if (Object.keys(obj).length === 0)
{ console.log("Empty Object") }
else { console.log("Not Empty Object") }

Empty Object

2. Using object.hasOwnProperty() Method

A function can be created to loop over the object and check if it contains any properties using object.hasOwnProperty() method. if it contains any property then it will return true else false. This method is useful for older browsers that may not support Object.keys().

let obj = {};
let res = true;

for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
        res = false;
        break;
    }
}
if (res == true) { console.log("Empty Object") }
else { console.log("Not Empty Object") };

Empty Object

3. Using JSON.stringify() Method

The JSON.stringify() method converts the object to a JSON string and then use "===" operator to check the object is empty or not.

let obj = {};
if (JSON.stringify(obj) === '{}') 
{ console.log("Empty Object") }
else { console.log("Not Empty Object") }

Empty Object

4. Using Lodash Library

The Lodash's _.isEmpty() method is used to check whether an object is empty or not. It returns True if object is empty and false otherwise.

const _ = require("lodash");
let obj = {};
if (_.isEmpty(obj) === true) 
{ console.log("Empty Object") }
else console.log("Not Empty Object")

Output

Empty Object