How to install Node.js and npm on CentOS 7

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Node.js is a cross-platform JavaScript run-time environment that allows server-side execution of JavaScript code.

Node.js is mainly used on the back-end, but it is also popular as a full-stack and front-end solution.npm, short for Node Package Manager is the default package manager for Node.js and the world’s largest software repository for the publishing of open-source Node.js packages.

This tutorial walks you through the steps to install Node.js and npm on a CentOS 7 machine. We will show you two different ways of installing Node.js and npm.
In the first part of this tutorial we will install Node.js and npm using the yum package manager from the NodeSource repository.

In the second part, we will teach you how to install Node.js and npm using the nvm script.

If you need Node.js only for deploying Node.js applications then the simplest option is to install the Node.js packages using yum from the NodeSource repository.

Prerequisites
Before continuing with this tutorial, make sure you are logged in as a user with sudo privileges.

Installing Node.js and npm on CentOS 7
NodeSource is a company dedicated to providing enterprise-grade Node support and they maintain a consistently-updated Node.js repository for Linux distributions.
To install Node.js and npm from the NodeSource repositories on your CentOS 7 system, follow these steps:

1. Add NodeSource yum repository
The current LTS version of Node.js is version 10.x. If you want to install version 8 just change setup_10.x with setup_8.x in the command below.
Run the following curl command to add the NodeSource yum repository to your system:

Code:
curl -sL https://rpm.nodesource.com/setup_10.x | sudo bash -
2. Install Node.js and npm
Once the NodeSource repository is enabled, install Node.js and npm by typing:

Code:
sudo yum install nodejs
When prompted to import the repository GPG key, type y, and press Enter.
 
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3. Verify the Node.js and npm Installation
To check that the installation was successful, run the following commands which will print the Node.js and npm versions.

Print Node.js version:

Code:
node --version
v10.13.0
Print npm version:

Code:
npm --version
6.4.1
How to install Node.js and npm using NVM
NVM (Node Version Manager) is a bash script used to manage multiple active Node.js versions. NVM allows us to install and uninstall any specific Node.js version which means we can have any number of Node.js versions we want to use or test.
To install Node.js and npm using NVM on your CentOS system, follow these steps:

1. Install NVM (Node Version Manager)
To download the nvm install script run the following command:

Code:
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash
The script will clone the nvm repository from Github to ~/.nvm and add the script Path to your Bash or ZSH profile.


Code:
=> Close and reopen your terminal to start using nvm or run the following to use it now:

export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
As the output above shows, you should either close and reopen your terminal or run the commands to add the path to nvm script to your current session.

To verify that nvm was properly installed type:

Code:
nvm --version
Output
Code:
0.33.11
2. Install Node.js using NVM
Now that the nvm tool is installed we can install the latest available version of Node.js, by typing:

Code:
nvm install node
Output
Code:
Downloading and installing node v11.0.0...
Downloading https://nodejs.org/dist/v11.0.0/node-v11.0.0-linux-x64.tar.xz...
######################################################################## 100.0%
Computing checksum with sha256sum
Checksums matched!
Now using node v11.0.0 (npm v6.4.1)
Creating default alias: default -> node (-> v11.0.0)
Verify the Node.js version, by typing:

Code:
node --version
Output
Code:
v10.1.0
Copy
3. Install multiple Node.js versions using NVM
Let’s install two more versions, the latest LTS version and version 8.12.0

Code:
nvm install --ltsnvm install 8.12.0
Once LTS version and 8.12.0 are installed to list all installed Node.js instances type:

Code:
nvm ls
Output
Code:
->      v8.12.0                         # ACTIVE VERSION
       v10.13.0
        v11.0.0
default -> node (-> v11.0.0)           # DEFAULT VERSION
node -> stable (-> v11.0.0) (default)
stable -> 11.0 (-> v11.0.0) (default)
iojs -> N/A (default)
lts/* -> lts/dubnium (-> v10.13.0)
lts/argon -> v4.9.1 (-> N/A)
lts/boron -> v6.14.4 (-> N/A)
lts/carbon -> v8.12.0
lts/dubnium -> v10.13.0
The output tell us that the entry with an arrow on the left (-> v8.12.0), is the version used in the current shell session and the default version is set to v11.0.0. Default version is the version that will be active when opening new shells.

To change the currently active version you can use the following command:

Code:
nvm use 10.13.0
The output will look like something this:

Code:
Now using node v10.13.0 (npm v6.4.1)
To change the default Node.js version type:

Code:
nvm alias default 10.13.0
Output

Code:
default -> 10.13.0 (-> v10.13.0)
 
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