npm install nodejs locally

As Node.js becomes more and more popular, the Node.js package manager npm is also becoming more and more popular. npm allows developers to quickly install and manage Node.js modules and is an important part of the Node.js ecosystem.

However, in some cases, we may need to install Node.js locally instead of using the global installation provided in the system. Local installation can help us better manage Node.js versions without affecting the current system environment. Below, we’ll discuss how to install Node.js locally and use npm.

1. Install Node.js

The official website of Node.js provides installation packages for different platforms. We can download and install the appropriate version on the website. In the process of installing Node.js locally, we need to pay attention to the following aspects:

1. Version selection: Different versions of Node.js may have differences, and we need to choose the most suitable one according to our needs. own version.
2. Installation path: It is recommended to install Node.js in a relatively independent directory for easier management and maintenance.
3. Environment variables: After the installation is complete, we need to configure environment variables to use the node command in the terminal.

After the installation is complete, we can enter the node command in the terminal to check whether the installation is successful. If the installation is successful, an interactive command line interface will appear where we can try some simple JavaScript code.

2. Use npm

npm is the package manager that comes with Node.js. In addition to supporting installation packages, it can also assist developers in managing dependencies, publishing packages, etc. The following are some commonly used npm commands:

1. npm init: used to initialize an npm project and create a package.json file.
2. npm install: Used to install the specified npm module. The module will be installed in the node_modules directory of the project.
3. npm install --save/-S: Used to install the specified npm module and add the module to the dependencies of package.json.
4. npm install --save-dev/-D: Used to install the specified npm module and add the module to the devDependencies of package.json.
5. npm uninstall: used to uninstall the specified npm module.

3. Local installation and global installation

In npm, we can use the -g parameter for global installation, or we can install it locally without adding parameters. The difference is:

1. Globally installed modules can be accessed by all projects in the system.
2. Locally installed modules can only be used in the current project.

Therefore, we can choose to use global installation or local installation according to our needs. If we want multiple projects to be able to share a module, we should use global installation; otherwise, local installation will be safer and will not cause conflicts due to different versions of the same module.

4. Summary

Installing Node.js locally and using npm can help us better manage Node.js programs. By using npm, we can easily install and manage Node.js modules and handle dependencies conveniently. At the same time, local installation can also help us avoid conflicts that may arise from using global installation. Therefore, we can choose to use local installation or global installation according to actual needs to ensure the smooth operation of the Node.js program.

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