Query nodejs installation directory

When developing with Node.js, it is often necessary to query the installation directory of Node.js for related configuration and operations. In this article, we will discuss how to query the Node.js installation directory and introduce related configuration and operations.

1. Find the installation directory of Node.js

Find the installation directory of Node.js through the command line, which may vary depending on the operating system. Under the Windows operating system, you can use the following method to find the installation directory of Node.js:

1.1 Use the where command

The where command can be used to query the location of the executable file in the current environment of the Windows system , so you can query the Node.js installation directory through this command.

In the command prompt window, enter the following command:

where node

This command will return all paths to the Node.js executable file. The first path is the installation directory of Node.js, as shown in the following figure:

1.2 Use the npm command

The npm command is Node.js Package manager commands can also be used to query the installation directory of Node.js. In the command prompt window, enter the following command:

npm root -g

This command will return the Node.js global package installation path, as shown in the following figure:

2. Configuring the environment variables of Node.js

Configuring the environment variables of Node.js allows developers to use Node.js and npm commands directly in the command line window. The following are the steps to configure Node.js environment variables:

2.1 Find the installation directory of Node.js

Use the method introduced in the first part to find the installation directory of Node.js.

2.2 Configure the PATH environment variable

In Windows systems, you can configure the PATH environment variable through the following methods:

1. Right-click "Computer" (desktop or file resources Manager), select Properties.
2. Click "Advanced System Settings".
3. In the "System Properties" dialog box, select "Environment Variables".
4. In "User Variables" or "System Variables", find the PATH variable and click "Edit".
5. In the "Edit Environment Variables" dialog box, click "New".
6. Enter the installation directory of Node.js and click "OK".
7. Click "OK" to close all dialog boxes and save changes.

2.3 Verify whether Node.js is configured successfully

In the command prompt window, enter the following command:

node -v

If the version number of Node.js is returned , then the configuration is successful, as shown in the following figure:

3. Further configuration and operation of Node.js

After configuring Node .js environment variables, developers can use Node.js and npm commands directly in the command line window. The following are some examples of further configuration and operation of Node.js:

3.1 Install the module using npm

In the command prompt window, enter the following command:

npm install 包名

This command Node.js modules will be installed by default. For example, install the Express module:

npm install express

3.2 Create a Node.js project using npm

In the command prompt window, enter the location where you want to store the project folder, for example:

cd C:UsersYourNameDocuments

Then enter the following command to create the project folder:

mkdir myProject

Next enter the myProject folder:

cd myProject

Use the following command to initialize the project:

npm init

This command will Guide you to fill in the project information and generate a package.json file. This file records your project dependencies and configuration information.

3.3 Use Node.js to run the JavaScript file

In the command prompt window, enter the following command:

node 文件名.js

This command will use Node.js to run the JS file .

4. Conclusion

Node.js is a very powerful JavaScript back-end development tool, very suitable for developing high-performance, high-concurrency, and real-time web applications. When developing with Node.js, querying the Node.js installation directory is a very important step. In this article, we introduce two methods to query the installation directory of Node.js, and introduce how to configure the environment variables of Node.js, as well as some examples of further configuration and operation of Node.js. With this knowledge, I believe the development and application of Node.js will be smoother.

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