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Node.js module system

The module system of Node.js is one of its core features, which allows developers to organize code into reusable modules. This system promotes modularization of code, making it easier to build and manage large applications. This article will take a deep look at the module system of Node.js, including how it works, how to create and use modules, and the advantages and limitations of the module system.

How the module system works

Node.js uses the CommonJS module specification, which is a specification for synchronously loading modules. Each file is considered an independent module with its own scope. Modules are loaded through require Function loading, throughexports Object ormodule.exports Export members.

When Node.js loads a module, it executes the code in the module file and stores the exported interface in a cache. require The call will fetch the module directly from the cache, which increases loading speed.

Creating and using modules

Creating a Module

Creating a module is simple. You just need to write JavaScript code in a file and pass exports ormodule.exports Export functions, objects, or variables that you want other modules to access.

For example, create a logger.js Module for logging:

// logger.js
function log(message) {
  console.log(message);
}

module.exports = log;
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Using Modules

To use a module you can use in another file require Function introduces it.require The function accepts a