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How to Merge Properties of Two JavaScript Objects Dynamically?

Last Updated : 11 Jul, 2025
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Here are two different ways to merge properties of two objects in JavaScript.

1. Using Spread Operator

The Spread operator allows an iterable to expand in places where 0+ arguments are expected. It is mostly used in the variable array where there is more than 1 value is expected. It allows the privilege to obtain a list of parameters from an array. Javascript objects are key-value paired dictionaries.

Syntax

object1 = {...object2, ...object3, ... }
javascript 
let A = {
    name: "geeksforgeeks",
};

let B = {
    domain: "https://www.geeksforgeeks.org/"
};

let Sites = { ...A, ...B };

console.log(Sites)

Output
{ name: 'geeksforgeeks', domain: 'https://www.geeksforgeeks.org/' }

2. Using Object.assign() Method

We can also use the Object.assign() method to merge different objects. that function helps us to merge the two different objects.

javascript 
let A = {
    name: "geeksforgeeks",
};

let B = {
    domain: "https://www.geeksforgeeks.org/"
};

let Sites = Object.assign(A, B);

console.log(Sites);

Output
{ name: 'geeksforgeeks', domain: 'https://www.geeksforgeeks.org/' }

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