How to use nodejs npm global installation and precautions

Node.js is a JavaScript runtime environment that can run on the server side. It allows developers to use JavaScript to write operating system-independent applications. The modular development method of Node.js allows developers to easily split different functions into different modules, improving the maintainability and scalability of the code.

In addition to the built-in core modules, the Node.js community provides a wealth of third-party modules for developers to use. npm is the official package management tool for Node.js. Developers can use the npm command to download and manage the third-party modules they need from the npm warehouse.

When installing and using third-party modules, there are two installation methods: local installation and global installation. Local installation installs third-party modules in the node_modules folder of the current project, while global installation installs third-party modules into the global environment of the system. The following will introduce the usage and precautions of npm global installation.

1. Use npm to install globally

It is very simple to install third-party modules globally using npm. You only need to enter the following command in the terminal:

npm install -g <module-name>

Among them, <module-name> is the name of the third-party module you want to install.

For example, if we want to install nodemon globally, we only need to enter the following command in the terminal to complete the global installation:

npm install -g nodemon

2. Precautions for global installation

When using npm global installation, you need to pay attention to the following points:

• Try not to abuse global installation: globally installed third-party modules will be installed globally in the system environment, try not to abuse global installation to avoid installed modules conflicting with each other, resulting in system instability.
• Confirm the path of the npm global environment: Use the npm root -g command to view the path of the npm global environment. By default, the path of the npm global environment is /usr/local/ lib/node_modules.
• Confirm whether the global command is added to the PATH environment variable: Globally installed third-party modules will also generate command line tools, such as nodemon, which need to be added to the system's PATH environment variable. , the command can be executed in any path.

To sum up, using npm to globally install third-party modules can facilitate developers to use third-party modules in any path and improve development efficiency. However, it is important to note that abusing global installation may cause system stability issues. When using global installation, you need to confirm whether the path and command of the global environment are added to the PATH environment variable.

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