nodejs in the installation directory

Node.js is a JavaScript runtime environment that can run JavaScript code on the server side. It uses the V8 engine to execute JavaScript code and provides a collection of some commonly used APIs and libraries to facilitate developers for server-side development.

When developing with Node.js, you first need to install Node.js. After the installation is complete, we need to configure the Node.js environment variables to use Node.js commands directly on the command line.

In Windows systems, the default installation location of Node.js is "C:Program Files
odejs". If you are using another operating system or a custom installation directory, you need to modify the method provided below accordingly.

Installing Node.js

First, you need to download the installer from the Node.js official website. The official website address is https://nodejs.org/. You can select the corresponding version on the website to download.

After the download is completed, double-click the installer and the system will automatically guide you to complete the installation process. During the installation process, you can select the installation directory. If you do not need to customize the installation directory, you can directly use the default installation directory.

Configuring environment variables

After the installation is completed, we need to configure the environment variables of Node.js. Environment variables are a list of paths used by the operating system to find programs. When we execute a command on the command line, the system will look for the corresponding executable file in the environment variables.

In Windows systems, environment variables are managed separately by system variables and user variables. System variables are for all users, while user variables are limited to the current user.

First, we need to open the environment variable configuration window. In the Windows operating system, you can use the following two methods to open the environment variable configuration window:

1. In the file explorer, right-click "Computer", select "Properties", in the opened window Select the "Advanced System Settings" tab and click the "Environment Variables" button.
2. Search for "Environment Variables" in the Start menu, and select the "Edit System Environment Variables" option in the pop-up search results.

After opening the environment variable configuration window, we need to perform the following operations:

1. Add the installation path of Node.js to the environment variable. Find the "Path" variable in the system variables, double-click it to open the editing window, and add the Node.js installation path at the end of the existing path list. Use semicolons ";" to separate paths, and note that they are case-sensitive. After adding, click "OK" to save.
2. Add Node.js commands to environment variables. In the installation directory, there is an executable file named "node", which is the command of Node.js. In order to use Node.js commands directly from the command line, we need to add the path to this file to the environment variable. Find the "Path" variable in the system variables, double-click it to open the editing window, and add the path where the Node.js command is located at the end of the list. After adding, click "OK" to save.

After completing the above two steps, we can use Node.js commands in the command line.

Verify whether Node.js is installed normally

After completing the above operations, we can enter the following command on the command line to verify whether Node.js has been successfully installed:

$ node -v

This command can check the installed Node.js version number. If the correct version number is output, it means that Node.js has been successfully installed and the correct environment variables have been configured. If the output result is not a version number, or an error message indicates that the command cannot be found, it means that an error occurred during the installation or configuration process.

Summary

Node.js is a very excellent JavaScript runtime environment that allows us to run JavaScript code on the server side and provides a collection of some commonly used APIs and libraries for convenience Developers do server-side development. When using Node.js for development, you first need to install Node.js and configure the Node.js environment variables so that you can use Node.js commands directly on the command line.

In Windows systems, the default installation location of Node.js is "C:Program Files
odejs". If you are using another operating system or a custom installation directory, you need to modify the above method accordingly.

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