By default, npm install will install all modules listed as dependencies in package.json . With the –production flag (or when the NODE_ENV environment variable is set to production ), npm will not install modules listed in devDependencies .Reinstalling packages with npm is a common task in Node. js development when you need to refresh or update dependencies for your project. This process ensures that you have the latest versions of packages and resolves any issues related to package versions or corrupted installations.Uninstalling local packages

Include the scope if the package is scoped. This uninstalls a package, completely removing everything npm installed on its behalf. It also removes the package from the dependencies, devDependencies, optionalDependencies, and peerDependencies objects in your package.

How to install uninstall npm : The Node Package Manager (NPM) provides various commands that let you work with packages. And just as you can install a package from the npm library, you can uninstall it. To uninstall a package, you can use the command provided by npm for the purpose – npm uninstall .

What happens if I uninstall npm

This uninstalls a package, completely removing everything npm installed on its behalf. It also removes the package from the dependencies , devDependencies , optionalDependencies , and peerDependencies objects in your package.

Can I run npm install twice : Running npm install apart from the first time installs only the missing packages and those that need update. Save this answer. Running npm install after the first time only installs missing packages or updates existing ones.

On most systems, this is /usr/local . On Windows, it's %AppData%\npm . On Unix systems, it's one level up, since node is typically installed at {prefix}/bin/node rather than {prefix}/node.exe . When the global flag is set, npm installs things into this prefix.

Reinstall an npm package globally

Uninstalling a global package requires the -g flag and follows the same steps as above: Uninstall the package globally npm uninstall -g <package-name> Install the package globally npm install -g <package-name>

How to install npm completely

Installing NPM

1. Once Node. js is installed, open your terminal or command prompt.
2. To check if Node.
3. If NPM is not installed or is outdated, you can install it separately or update it by running the command npm install -g npm in the terminal.
4. To verify the NPM installation, type npm -v in the terminal.

npm solves this problem by handling dependency and package management for your project. You define all your project's dependencies inside your package. json file. Anytime you or a team member needs to get started with your project, all they have to do is run npm install.Once you've installed NPM (Node Package Manager) on your system, you can use it across multiple projects. NPM allows you to manage packages and dependencies for each project individually, so there's no need to reinstall it for each new project.

To manage multiple versions of npm packages in a single project, npm provides a feature called “aliasing”. This allows you to install different versions of the same package under different names, enabling you to use them independently within your project.

How does npm install packages : To install a package, npm uses the following algorithm:

1. load the existing node_modules tree from disk.
2. clone the tree.
3. fetch the package.json and assorted metadata and add it to the clone.
4. walk the clone and add any missing dependencies.
5. dependencies will be added as close to the top as is possible.

What does uninstall mean in npm : Npm uninstall is an essential command within the Node package manager that allows IT professionals to efficiently manage dependencies in their projects. This powerful tool enhances codebase optimization, conflict resolution, and overall project scalability.

How do I completely uninstall and reinstall npm

Reinstall an npm package globally

Uninstalling a global package requires the -g flag and follows the same steps as above: Uninstall the package globally npm uninstall -g <package-name> Install the package globally npm install -g <package-name>

For Mac and Linux users: type which npm and press Enter. This will show you where npm is installed. To remove npm, type sudo rm -rf /usr/local/bin/npm /usr/local/share/man/man1/node.js and NPM because NPM comes with node. js and gets installed while installing node. js. If NPM is not installed or is outdated, you can install it separately or update it by running the command npm install -g npm in the terminal.

Why can’t i use npm install : This can happen if the installation process was interrupted or if there were issues with the installation. The PATH was not updated after installing npm: If you installed npm but did not update the PATH, the operating system will not be able to find the npm executable.