What is NVM?

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NVM stands for Node Version Manager. It is a tool that allows developers to install and manage multiple versions of Node.js, which is essential for running and developing applications using Node.js. NVM enables you to quickly switch between Node.js versions, making it easier to test applications across different versions and manage dependencies that may have version-specific requirements.

Key Features and Benefits of NVM:

Multiple Node.js Versions: NVM allows the installation of multiple versions of Node.js on the same machine without conflict. This is particularly useful in environments where different projects require different Node.js versions.
Easy Switching: With NVM, you can switch between installed Node.js versions with a single command. This feature is extremely helpful for developers working on multiple projects or when updating Node.js versions in a project.
Project-specific Versions: NVM supports the use of a .nvmrc file in a project directory that specifies the version of Node.js to be used with that project. When you navigate to the project directory, you can simply run nvm use to switch to the required Node.js version as per the .nvmrc file.
No Sudo Required: NVM installs Node.js and global npm packages without requiring administrative access (sudo). This avoids permissions issues commonly encountered when using global npm packages.

Installing NVM:

The installation of NVM varies slightly between operating systems. Below are the basic steps for installing NVM on a Unix-like OS (Linux, macOS).

Install Script: You can install NVM using the curl or wget command. Here’s the curl command:

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash

Or, using wget:

wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash

Update Profile: After installation, you need to either restart your terminal or source your profile (.bash_profile, .zshrc, .profile, etc.) to begin using NVM:
```
source ~/.bash_profile  # Depends on which shell you are using
```

Using NVM:

List Available Versions: Check available Node.js versions to install:
```
nvm ls-remote
```
Install Node.js Version: Install a specific version of Node.js:
```
nvm install 14.17.0  # Replace with your desired version
```
Switching Node Versions: Switch between installed versions:
```
nvm use 14.17.0  # Replace with your desired version
```

Default Node Version: Set a default Node.js version:

nvm alias default 14.17.0  # Replace with your desired version

Use Cases:

Development and Testing: Test your applications across different Node.js versions to ensure compatibility.
Continuous Integration: Use specific versions of Node.js in CI/CD pipelines.
Learning and Experimentation: Try out new features of Node.js by easily switching between various versions.

Conclusion:

NVM is an invaluable tool for Node.js developers, providing flexibility and ease in managing multiple Node.js versions on a single machine. It simplifies the process of testing applications under different environments and helps manage version-specific dependencies effectively. Whether you are a hobbyist or a professional developer, NVM is a tool worth integrating into your development workflow.