Detailed explanation of nvm version management

Master Node Version Manager (nvm): Optimize Node.js version management

Node.js is a powerful server-side JavaScript runtime environment, which often requires the use of different Node.js versions based on project requirements. To make it easier to manage different versions of Node.js, Node Version Manager (nvm) is an indispensable tool. This article will introduce the basic concepts and usage of nvm, and provide code examples so that you can better understand how to use nvm in your project.

What is Node Version Manager (nvm)?

Node Version Manager, nvm for short, is a command line tool for managing Node.js versions. It allows you to easily switch and manage multiple Node.js versions on the same computer. Using nvm, you can choose to use a specific Node.js version in each project to ensure project compatibility and stability.

Install nvm

First, let's install nvm. Following are the steps to install nvm on Linux/macOS and Windows systems.

Install nvm on Linux/macOS

1. Open a terminal and run the following commands to install nvm:

   curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
   

2. Once the installation is complete, close and reopen the terminal window or run the following command to enable nvm:

   source ~/.bashrc
   

Install nvm on Windows

1. Download the Windows version of nvm installer: nvm-windows .

2. Run the installer and follow the prompts to install.

3. After the installation is complete, open a new Command Prompt window or PowerShell window and you will be able to use the nvm command.

Use nvm

Once nvm is installed, you can use it to install, switch, and manage Node.js versions. The following are some commonly used nvm commands and usage.

Install Node.js version

Use nvm to install a specific version of Node.js:

nvm install <node_version>

For example, to install Node.js 14.x version, you can run:

nvm install 14

Switch Node.js version

Use nvm to switch to the installed Node.js version:

nvm use <node_version>

For example, to switch to Node.js 14.x version, you can run:

nvm use 14

View installed Node.js version

Use the following command to view the installed Node.js version:

nvm ls

Default Node.js version

You can set the default Node.js version using the following command:

nvm alias default <node_version>

Use a specific Node.js version in your project

Create a file in the root directory of your project .nvmrcand specify the desired Node.js version in the file. Then, use the following command to enter the project directory:

nvm use

nvm will automatically use the Node.js version specified in the project.

Example: Using nvm to manage Node.js versions

Let's walk through an example to demonstrate how to use nvm to manage different Node.js versions in a project.

1. Create a new project folder and go into:

   mkdir my-node-project
   cd my-node-project
   

2. Create a file in the project folder .nvmrcand specify the desired Node.js version in it, for example 14.

   echo "14" > .nvmrc
   

3. Use nvm to enter the project and automatically switch to the specified Node.js version:

   nvm use
   

   If you have not previously installed Node.js 14, nvm will automatically download and install it.

Now, your project will run under Node.js 14 environment and you can continue developing your Node.js application.

summary

Node Version Manager (nvm) is a powerful tool for managing and switching between different versions of Node.js. Through this article, you have learned how to install nvm and learned how to use it to manage Node.js versions in your project. Using nvm, you can more easily handle different projects and different Node.js versions to meet the needs of the project. I hope this article can help you better understand and use nvm.

The above is the detailed explanation of nvm version management. Thank you for reading.
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