Set nodejs global directory

When we use Node.js to develop applications, we often use some third-party modules or packages. These modules or packages need to be introduced in the application code before they can be used. We can introduce these modules or packages in the following ways:

1. Relative path introduction: such as require('./module'), which uses a path relative to the current directory to reference the module or package;
2. Absolute path introduction: such as require('/usr/local/lib/node_modules/module'), which uses absolute paths to reference modules or packages.

Relative path introduction is relatively simple and can avoid the complexity of absolute paths. However, in large applications, many modules or packages often need to be referenced. At this time, if each file is introduced using a relative path, It will become very inconvenient. So is there a way to avoid using relative paths or absolute paths to introduce modules or packages? Here you need to use the global directory of Node.js.

The global directory of Node.js is used to store globally installed modules or packages. Global installation refers to the entire system, not to a certain project. The installed packages or modules can be installed in the system. Quote anywhere. When installing a module or package in the global directory, we can use the npm command. The specific command is as follows:

npm install -g moduleName

After executing the above command, the module or package can be installed in the global directory and can be installed in other Use require('moduleName') in the project code to reference the module or package. However, in some cases, we may need to change the location of the global directory, in which case settings need to be made.

The steps to set the global directory are as follows:

1. Determine the path of the global directory

You can use the following command to view the path of the global directory of the current system:

npm config get prefix

By default, the path of the global directory is /usr/local. If you need to change the path, you can add a folder name after it, as follows:

npm config set prefix /new/path

2. Add the global directory to the system environment variable

After setting the path to the global directory, we also need to add the path to the system environment variable so that the global installation can be correctly referenced in the code module or package. We can view the current environment variables through the following command:

echo $PATH

After obtaining the environment variable, we need to add the path of the global directory to the environment variable. The specific command is as follows:

export PATH=$PATH:/new/path/bin

where ,/new/path/bin is the path of the global directory.

3. Verify whether the setting is successful

We can use the following command to verify whether the setting is successful:

npm config get prefix

If the return result is the set global directory path, it means the setting is successful.

After the settings are completed, we can easily reference globally installed modules or packages in the code. In general, although setting up a global directory may require some time and effort, it can make our Node.js application more convenient and easier to use.

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