nodejs install modules

Node.js is one of the most popular JavaScript runtimes used in modern application development. When working with Node.js, we usually use many built-in and third-party modules to build applications. In this article, I will show you how to install modules in Node.js.

1. What is Node.js module

Node.js module is a set of functional codes that help developers complete various tasks in the Node.js environment. Node.js provides various built-in modules such as HTTP, HTTPS, FS, Path, etc., and there are many third-party modules that can be downloaded from NPM (Node.js Package Manager).

Using Node.js modules can greatly improve our programming efficiency and reduce tedious code writing time and application development time.

2. How to install Node.js module

1. Install using NPM

The Node.js environment comes with the Node.js package manager (npm), which enables development Authors are able to install the SDK's various dependencies in a clean, fast, and consistent manner. npm maintains a large software library including various modules, allowing us to install, update and uninstall them quickly and easily.

At a command line prompt in your local project folder, enter the following command to download the node.js module:

npm install <module_name>

This will automatically download and install the required modules from the NPM repository . During the download and installation process, you can see details of the installation process. If you need to install a specific version of the module, you can use the following command:

npm install <module_name>@

2. Manual installation

If the module you downloaded is not in the npm library, you can download and install it manually.

First, you need to download the ZIP file from the source of the module and extract the folder. Then, move them to the local project folder. In the project folder, find the package.json file, find the dependency key-value pair, and add the following code to install the module:

"dependencies":{
    "<module_name>": "file://path/to/module/extracted/folder"
}

where is the name of the module you installed manually, file ://path/to/module/extracted/folder is the path where the module file is stored. Run the following command to install the module:

npm install

This command will install the project dependencies, including the modules you installed manually, it will install all dependencies based on the modules defined in the package.json file.

3. Node.js module version control

In the development environment, we may not use the latest version of the module, because the new version may change its API, thus changing our application the behavior of. Therefore, when setting up a Node.js application, especially in a production environment, we must pay attention to the version of the module.

You can use npm or manual installation to install a specific version of the module. However, if we use more modules in our project, we need to use the "npm shrinkwrap" command to lock the versions of all dependencies.

npm shrinkwrap

This ensures that the version of a dependency is not changed without testing when the dependency is updated, installed, or uninstalled.

4. Summary

In Node.js development, modules are crucial. These modules make writing Node.js applications easy while also providing a lot of code reusability.

In this article, we explained how to install modules in Node.js using NPM or manually. We also learned how to control the versioning of modules in a project. Using what you've learned, you can start building your own applications in Node.js.

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