nodejs installed to c and environment configuration

Node.js is a very popular JavaScript runtime environment that allows developers to write back-end applications using JavaScript language. In this article, we will introduce how to install Node.js on Windows operating system and configure the environment variables of Node.js to use Node.js from the command line.

1. Download Node.js

First, download the appropriate installation for your operating system from the official website of Node.js (https://nodejs.org/en/) program. In this article, we will install the 64-bit Windows installer of Node.js version number 12.18.2. Once the download is complete, double-click to run the installer.

2. Install Node.js

After executing the installer, we can see the Node.js installation wizard. On the first page, we need to choose to accept the license agreement and click the "Next" button.

On the next page, we can select the installation directory of Node.js. By default, Node.js will be installed in the Program Files folder of the C drive. You can also choose to install Node.js elsewhere. Then, click the "Next" button.

On the next page, we can choose which Node.js components to install. By default, Node.js installs the full Node.js development kit. If not required, deselect the corresponding component. Then, click the "Next" button.

On the next page, we can see the installation overview of Node.js. Please check whether the selection and installation directory are correct, and then click the "Install" button.

Node.js will start installing. During installation, you may need to allow some security prompts. Please follow the prompts.

After the installation is completed, please click the "Finish" button to exit the installation wizard.

3. Configuring environment variables

When installing Node.js, the environment variables of the Windows operating system will also be automatically configured. Without automatic configuration, you need to manually configure environment variables to use Node.js from the command line.

First, open the Control Panel and select "System and Security"->"System". In the left panel, click Advanced system settings.

In the pop-up "System Properties" dialog box, select the "Advanced" tab and click the "Environment Variables" button.

In the pop-up "Environment Variables" dialog box, find the "System Variables" area and find the variable named "Path". Double-click the variable to open the Edit Environment Variables dialog box.

In the "Edit Environment Variables" dialog box, click the "New" button and add the path to the Node.js installation directory. In this article, Node.js is installed under the Program Files folder of the C drive, so we will add the "C:Program Files
odejs" path. After adding, click "OK" to close all dialog boxes.

4. Verify Node.js Installation

To verify that Node.js has been successfully installed and environment variables configured, we can run some Node.js commands in the command line. Open the command line and enter the following command:

node -v

This command will display the version number of the installed Node.js. If Node.js has been successfully installed and the environment variables are configured, the version number of Node.js should be displayed, such as "v12.18.2".

Next, try entering the following command:

node

This command will open the REPL (Read-Eval-Print Loop) command line interface of Node.js. If it opens successfully, you will see a prompt similar to ">". In this command line interface, you can execute JavaScript code.

At this point, we have completed the process of installing and configuring Node.js on the Windows operating system. Now you can start developing backend applications using Node.js.

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