How to install and manage Node.js via NVM.

NVM is called a node version manager, similar to the Ruby language's RVM (Ruby Version Manager). NVM provides an option to easily install Node.js. You can also use nvm to install a specific Node.js version or multiple Node.js versions on the same system and use the version required by your application. This article will introduce how to install and use NVM to manage Node.js.

The default NVM installation is in the current user's home directory, so other users cannot access one user's nvm installation.

Step 1: Install NVM

First, NVM needs to be installed on the system, a bash script can be used to install nvm on the system. Use the following commands to install NVM on your Linux system.

$ curl https://raw.githubusercontent.com/creationix/nvm/master/install.sh | bash

Use this command to reload the system environment. It will set the environment variables required to use NVM on your system.

$ source ~/.profile## Debian based systems
$ source ~/.bashrc## CentOS/RHEL systems

Step 2: Find available node.js versions

At this point, you have NVM installed on your system for the current user. Now find the available version of node.js to install. Use the ls remote option to list versions.

$ nvm ls-remote

You will see a list of available versions

...
  ...
       v10.12.0
       v10.13.0   (LTS: Dubnium)
       v10.14.0   (LTS: Dubnium)
       v10.14.1   (LTS: Dubnium)
       v10.14.2   (LTS: Dubnium)
       v10.15.0   (Latest LTS: Dubnium)
        v11.0.0
        v11.1.0
        v11.2.0
        v11.3.0
        v11.4.0
        v11.5.0
        v11.6.0
        v11.7.0
        v11.8.0

Step 3: Install node.js using NVM

Now install everything you need to run the node.js application The required node.js version. The following command will install node.js v8.10.0 LTS version on your system.

$ nvm install v10.15.0

You can also install the latest version of node.js.

$ nvm install v11.8.0

Repeat the above command with different node.js versions to install multiple versions of node.js on your system.

Step 4: Set the node.js default version

Since multiple node.js versions are installed, you can select a specific version of node.js as the default version used by the system and set it in the environment loading in. Use the command below to list the currently installed and default settings versions.

$ nvm list

       v10.15.0
        v11.8.0
->       system
node -> stable (-> v11.8.0) (default)
stable -> 11.8 (-> v11.8.0) (default)
iojs -> N/A (default)
unstable -> N/A (default)
lts/* -> lts/dubnium (-> v10.15.0)
lts/argon -> v4.9.1 (-> N/A)
lts/boron -> v6.16.0 (-> N/A)
lts/carbon -> v8.15.0 (-> N/A)
lts/dubnium -> v10.15.0

You can see that node.js version 11.8.0 is set as the default version. The default node.js version can be changed. The command below sets 10.15.0 as the default node.js version.

$ nvm use v10.15.0

Now verify the current version of node.js

$ node --version

v10.15.0

Step 5: Run the application with a specific version

If you have Multiple node.js applications and want to run each application with a specific version of node.js. NVM gives you the option to run any application using the node.js version. For example

$ nvm run v10.15.0 app.js

Step 6: Remove unused node.js versions

This command will provide a list of installed node.js versions on your system.

$ nvm list

Any version installed on your system can be removed using the following command. The following command will remove node.js version 10.15.0 from the system.

$ nvm remove v10.15.0

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