What is require in javascript?

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In JavaScript, the require function is a fundamental feature that allows developers to include external modules or libraries into their code. It plays a crucial role in modularizing JavaScript applications and enables code reuse. This article will explore the concept of require in JavaScript, its usage, and its significance in modern web development.

What is require in JavaScript?

In JavaScript, require is a built-in function that is primarily used in Node.js, a server-side JavaScript runtime environment. It allows developers to load modules or files that contain reusable code into their applications. The require function takes a module identifier as its parameter and returns the exported functionality of the specified module.

Usage of require

To use the require function in JavaScript, you need to follow a few steps. First, you must ensure that the required module is installed in your project. This can be done using package managers like npm (Node Package Manager). Once the module is installed, you can use the require function to import it into your code.

The syntax for using require is as follows:
const module = require(‘module-name’);

Here, ‘module-name’ refers to the name of the module you want to import. The require function returns the exported functionality of the module, which can then be assigned to a variable (in this case, ‘module’).

Common Use Cases

The require function is commonly used in JavaScript for various purposes, including:
– Importing external libraries or frameworks: With require, you can easily include external libraries or frameworks into your project. This allows you to leverage the functionality provided by these libraries and enhance your application.
– Loading custom modules: In addition to external libraries, you can also create your own modules and load them using require. This promotes code organization and reusability within your project.
– Implementing server-side functionality: In Node.js, the require function is extensively used to include modules that handle server-side functionality, such as handling HTTP requests, interacting with databases, or performing file operations.

Benefits of using require

The require function offers several benefits in JavaScript development:
– Modularity: By using require, you can break down your code into smaller, manageable modules. This promotes code organization, reusability, and maintainability.
– Code reuse: The ability to import and use external modules allows you to reuse existing code, saving development time and effort.
– Dependency management: require simplifies the process of managing dependencies within your project. It ensures that all required modules are properly installed and available for use.


In conclusion, the require function in JavaScript is a powerful tool that enables developers to import external modules or files into their applications. It plays a crucial role in code modularity, reusability, and dependency management. By leveraging the require function, developers can enhance their JavaScript projects with external functionality and improve overall development efficiency.


– nodejs.org
– npmjs.com