Merging objects in JavaScript is a common task in web development, especially when working with complex data structures. There are several methods to merge objects, and each has its own use case depending on the requirements of the project. One of the simplest ways to merge objects is by using the spread operator. The spread operator can be used to create a new object containing the properties of the original objects. Here's an example: const obj1 = {a: 1, b: 2}; const obj2 = {b: 3, c: 4}; const mergedObj = {...obj1, ...obj2}; // {a: 1, b: 3, c: 4} Another method to merge objects is by using the Object.assign() method. The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. Here's an example: const obj1 = {a: 1, b: 2}; const obj2 = {b: 3, c: 4}; const mergedObj = Object.assign({}, obj1, obj2); // {a: 1, b: 3, c: 4} When using Object.assign(), be aware that it only performs a shallow merge, meaning that nested objects are not merged recursively. If you need to merge objects with nested properties, you can use libraries like Lodash, which provides a deep merge function. Here's an example using Lodash: const _ = require('lodash'); const obj1 = {a: {b: 1}}; const obj2 = {a: {c: 2}}; const mergedObj = _.merge(obj1, obj2); // {a: {b: 1, c: 2}} Lastly, you can also merge objects using the ES6 Object.fromEntries() method. This method creates an object from an iterable, such as an array of key-value pairs. Here's an example: const obj1 = {a: 1, b: 2}; const obj2 = {b: 3, c: 4}; const mergedObj = Object.fromEntries([...Object.entries(obj1), ...Object.entries(obj2)]); // {a: 1, b: 3, c: 4} These are some of the common methods to merge objects in JavaScript. Each method has its own strengths and weaknesses, so it's important to choose the one that best fits the requirements of your project. Whether you need a simple shallow merge or a more complex deep merge, JavaScript provides various options to handle object merging efficiently.