Let's talk about how to open Node.js through CMD under Wind system

How to open Node.js with CMD

When developing or learning using Node.js, we often need to use command line tools to execute some Node.js scripts or install some Node.js packages. Under Windows systems, we can use CMD to perform these operations. However, for some beginners, they may not know how to open the CMD command line and use the command line to execute Node.js scripts. Therefore, this article will teach you how to open Node.js through CMD under Windows system.

Step 1: Open the Windows command line
First, we need to open the Windows command line, usually also called CMD. There are several ways to open CMD.
Method 1: Use the menu bar
Click the "Start" button in the lower left corner of the taskbar. In the "Start" menu, click the "Windows System" folder under "Windows System" or "All Applications" , and then select Command Prompt or Command Prompt (Admin).
Method 2: Use shortcut keys
Press the Win R key on the keyboard, enter "cmd" and click the "OK" button. This will open a command prompt window.

Step 2: Check whether Node.js is installed successfully
After opening the CMD command line, you can enter the following command to check whether Node.js is installed on your computer Success:

node -v

This command will display the version number of Node.js you installed, such as v14.15.1. If the results displayed do not match the version number you have installed, you may need to reinstall Node.js. Otherwise, your Node.js has been successfully installed.

Step 3: Execute Node.js script
Now, you have successfully installed Node.js and opened the CMD command line. Next, we can use the CMD command line tool to execute Node. js script.
Suppose you create a Node.js script named "app.js" and place it in the D:\node-app directory. We can use the following command to execute the script in the CMD command line:

node D:\node-app\app.js

With the above command, we can execute the Node.js script in the CMD command line and output the results.

Step 4: Install Node.js package
Various packages are often used when using Node.js for software development. You can use the npm package management tool to install various packages. npm is a package management tool that is installed with Node.js. Let's take a look at how to use npm to install packages.
Let's take the express framework installation as an example. You can enter the following command on the command line:

npm install express

The above command will install the express framework and save the relevant files in the node_modules directory. During the installation process, npm will automatically download the required files from the official repository and install them.

Summary
Through this article, you have learned how to use the CMD command line to open Node.js, and how to use the CMD command line to execute Node.js scripts and install Node.js packages. It is very necessary to be able to use the command line in daily Node.js development. It can help us complete our work more conveniently and efficiently.

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