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how to updating  Node.js and npm

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Installing Node.js and updating npm

How do I update Node.js ?

Note: Python 2.6 or 2.7 is required to build from source tarballs.

Installing Node.js via package manager

Debian and Ubuntu based Linux distributions

Also including: Linux Mint, Linux Mint Debian Edition (LMDE), elementaryOS and others.

Node.js is available from the NodeSource Debian and Ubuntu binary distributions repository (formerly Chris Lea'sLaunchpad PPA). Support for this repository, along with its scripts, can be found on GitHub atnodesource/distributions.

NOTE: If you are using Ubuntu Precise or Debian Wheezy, you might want to read about running Node.js >= 4.x on older distros.

curl -sL https://deb.nodesource.com/setup_4.x | sudo -E bash -
sudo apt-get install -y nodejs

Alternatively, for Node.js v6:

curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -
sudo apt-get install -y nodejs

Optional: install build tools

To compile and install native addons from npm you may also need to install build tools:

sudo apt-get install -y build-essential

Available architectures:

• i386 (32-bit)
• amd64 (64-bit)
• armhf (ARM 32-bit hard-float, ARMv7 and up: arm-linux-gnueabihf)

Supported Ubuntu versions:

• Ubuntu 12.04 LTS (Precise Pangolin)
• Ubuntu 14.04 LTS (Trusty Tahr)
• Ubuntu 16.04 LTS (Xenial Xerus)

Supported Debian versions:

• Debian 7 (wheezy)
• Debian 8 / stable (jessie)
• Debian testing (stretch, aliased to jessie)
• Debian unstable (sid)

A Node.js package is also available in the official repo for Debian Sid (unstable), Jessie (testing) and Wheezy (wheezy-backports) as "nodejs". It only installs a nodejs binary.

The nodejs-legacy package installs a node symlink that is needed by many modules to build and run correctly. The Node.js modules available in the distribution official repositories do not need it.

Supported Linux Mint versions:

• Linux Mint 13 "Maya" (via Ubuntu 12.04 LTS)
• Linux Mint 17 "Qiana" (via Ubuntu 14.04 LTS)
• Linux Mint 17.1 "Rebecca" (via Ubuntu 14.04 LTS)
• Linux Mint 17.2 "Rafaela" (via Ubuntu 14.04 LTS)
• Linux Mint Debian Edition (LMDE) 2 "Betsy" (via Debian 8)

Supported elementary OS versions:

• elementary OS Luna (via Ubuntu 12.04 LTS)
• elementary OS Freya (via Ubuntu 14.04 LTS)

Supported Trisquel versions:

• Trisquel 6 "Toutatis" (via Ubuntu 12.04 LTS)
• Trisquel 7 "Belenos" (via Ubuntu 14.04 LTS)

Supported BOSS versions:

• BOSS 5.0 "Anokha" (via Debian 7)

Windows

Simply download the Windows Installer directly from the nodejs.org web site.

Alternatives

Using Chocolatey:

cinst nodejs
# or for full install with npm
cinst nodejs.install

Using Scoop:

scoop install nodejs

 

 

 

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https://ide.c9.io/xgqfrms/freecodecamp#openfile-README.md

https://docs.npmjs.com/getting-started/installing-node

https://nodejs.org/en/download/

https://nodejs.org/en/download/current/

How do I update npm?

$sudo npm install -g npm

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How install two version Node in one PC ?

Installing and switching between multiple versions of Node.js: n vs. nvm

n at a glance

GitHub:	https://github.com/visionmedia/n
Install:	$ npm install -g n
Path to Script:	/usr/local/bin/n
Node Versions Path:	/usr/local/n/versions
How n gets a new version:	Downloads Binary Node tar.gz file for platform
How n switches versions:	Copies files from /usr/local/n/versions/ to /usr/local/

nvm at a glance

GitHub:	https://github.com/creationix/nvm
Install:	curl https://raw.github.com/creationix/nvm/master/install.sh | sh
Path to Script:	~/.nvm/nvm.sh
Node Versions Path:	~/.nvm/
How nvm gets a new version:	Downloads and compiles source node distribution (binary option also available)
How nvm switches versions:	updates $PATH variables to point to requested version within ~/.nvm/ directory

https://github.com/xgqfrms-GitHub/nvm

https://www.quora.com/How-can-I-use-two-versions-of-Node-js-to-run-two-different-applications-for-each-version-in-the-same-server

How can I use two versions of Node.js to run two different applications for each version in the same server?

For example
application(1) run in nodejs 0.10.32
application(2) run in nodejs 0.8.9
in the same server

3 Answers

Raphael Mu, Awaits the deferred promise of Node.js 1.0.

Written 14 Oct 2014

To to run two different versions of Node.js at once, I would use Tim's nvm (node version manager) (creationix/nvm).

You can then easily install, switch to, or deploy multiple node versions.

1. nvm install 0.10.32
2. nvm install 0.11.14

Afterwards, you can run two node versions at once:

1. nvm run 0.10.32 thisApp.js
2. nvm run 0.11.14 thatApp.js

1.4k Views · View Upvotes · Answer requested by ALi Baker

https://www.sitepoint.com/quick-tip-multiple-versions-node-nvm/

Quick Tip: Install Multiple Versions of Node.js using nvm

By Bruno Mota March 14, 2016

This article was peer reviewed by Tim Severien. Thanks to all of SitePoint’s peer reviewers for making SitePoint content the best it can be!

When developing Node.js applications you might face situations where you need to install multiple versions of Node. This can happen when you have multiple projects and they have different requirements, or you have a deployable application which must be compatible with different Node versions. Without a good tool this would mean a lot of work and effort to install the different versions manually, and basing a project on a specific version. Fortunately there is a better way!

 More from this author

• Project Documentation with Hexo Static Site Generator
• Quick Tip: Build a Video Player Component in React

Introducing nvm

nvm stands for Node Version Manager. As the name suggests, it helps you manage and switch between different Node versions with ease. It provides a command line interface where you can install different versions with a single command, set a default, switch between them and much more.

OS Support

nvm supports both Linux and OS X, but that’s not to say that Windows users have to miss out. There is a second project named nvm-windows which offers Windows users the possibility of easily managing Node environments. Despite the name, nvm-windows is not a clone of nvm, nor is it affiliated with it. However, the basic commands listed below (for installing, listing and switching between versions) should work for both nvm and nvm-windows.

Installation

Windows

First, make sure you uninstall any Node.js version you might have on your system, as they can collide with the installation. After this, download the latest stable installer. Run the executable installer, follow the steps provided and you’re good to go!

OS X/Linux

Removing previous Node installations is optional, although it is advised you do so. There are plenty of good resources online as to how you might do this (OS X, Linux). It is also good if you remove any npm installation you might have, since it might collide with nvm’s installation. You’ll also need to have a C++ compiler installed on your system. For OS X you can install the Xcode command line tools. You can do this by running the following command:

xcode-select --install

On Linux, you can install the build-essential package by running the following (assumes apt):

sudo apt-get update
sudo apt-get install build-essential

Having the required C++ compiler you can then install nvm using cURL or Wget. On your terminal, run the following:

With cURL:

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.31.0/install.sh | bash

Or with Wget:

wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.31.0/install.sh | bash

Note that the version number (v0.31.0) will change as the project develops, so it is worth checking the relevant section of project’s home page to find the most recent version.

This will clone the nvm repository to ~/.nvm and will make the required changes to your bash profile, so that nvm is available from anywhere in your terminal.

That’s it, nvm is installed and ready to be used.

Using nvm

If installed correctly, the nvm command is available anywhere in you terminal. Let’s see how to use it to manage Node.js versions.

Install Multiple Versions of Node.js

One of the most important parts of nvm is, of course, installing different versions of Node.js. For this, nvm provides the nvm install command. You can install specific versions by running this command followed by the version you want. For example:

nvm install 4.2.2

By running the above in a terminal, nvm will install Node.js version 4.2.2. nvm follows SemVer, so if you want to install, for example, the latest 4.2 patch, you can do it by running:

nvm install 4.2

nvm, will then install Node.js version 4.2.X, where X is the highest available version. At the time of writing this is 6, so you’ll have 4.2.6 version installed on your system. You can see the full list of available versions by running:

nvm ls-remote

For nvm-windows this is:

nvm ls available

npm

When installing a Node.js instance, nvm will also install a compatible npm version. Each Node version might bring a different npm version and you can run npm -v to check which one you’re currently using. Globally installed npm packages are not shared among different Node.js versions, as this could cause incompatibilities, rather they are installed alongside the current Node version in ~/.nvm/versions/node/<version>/lib/node_modules. This has the added advantage that users will not require sudo privileges to install global packages.

Fortunately when installing a new Node.js version you can reinstall the npm global packages from a specific version. For example:

nvm install v5.0.0 --reinstall-packages-from=4.2

By running the above nvm will install you Node.js version 5.0.0, the corresponding npm version, and reinstall the npm packages you had installed on the 4.2 version.

nvm will always target Node.js when only a version is specified, but it also allows to install io.js instances. To do so, the version needs to be prefixed with iojs-v:

nvm install iojs-v3.2.0

The above command will install io.js version 3.2.0 on your system.

To help even further, nvm has some aliases that you can use to target versions without writing a specific version:

• node – this installs the latest Node.js version.
• iojs – this installs the latest io.js version.
• unstable – this installs Node.js 0.11 version, which is the last unstable version.

So, to install the latest Node.js version, you can just run:

nvm install node

You can also uninstall any instance you no longer think is useful, by running:

nvm uninstall 4.2.2

Switching between Versions

So far, we’ve seen how to install different Node versions. Let’s now go through how to switch between them. Let me first note that when a new version is installed, it is automatically put to use. So if you install latest Node.js version, and run node -v right after, you’ll see the latest version output.

To switch through installed versions, nvm provides the nvm use command. This works similar to the install command. So, you need to follow this by a version number or one of the aliases.

Following the install commands demonstrated above, you can:

Switch to Node.js version 4.2.2:

nvm use 4.2.2

Switch to Node.js version 4.2.6:

nvm use 4.2

Switch to io.js version 3.2.0:

nvm use iojs-v3.2.0

Or switch to latest Node.js version:

nvm use node

When switching to a different version, nvm will make the node instance in your terminal symlink to the proper Node.js instance.

You can also create custom aliases beyond the ones that come with nvm. For example by running:

nvm alias awesome-version 4.2.2

You’re setting an alias with the name ‘awesome-version’ for Node.js version 4.2.2. So, if you now run:

nvm use awesome-version

nvm will switch node to version 4.2.2. You can delete an alias by running

nvm unalias awesome-version

You can also set a default instance to be used in any shell, by targeting a version to the ‘default’ alias, like so:

nvm alias default node

Listing Installed Instances

At anytime you can check which versions you have installed by running:

nvm ls

This will display something resembling the following:

The entry in green, with an arrow on the left is the current version in use. Below the green and blue list, there is a list of available aliases. If you now execute:

nvm use node
nvm ls

It will display:

You can also check what is the current version in use with the command:

nvm current

Specify a Node Version on a Per-Project Basis

Version managers such as rbenv allow you to specify a Ruby version on a per-project basis (by writing that version to a.ruby-version file in your current directory). This is kind of possible with nvm in that if you create a .nvmrc file inside a project and specify a version number, you can cd into the project directory and type nvm use. nvm will then read the contents of the .nvmrc file and use whatever version of Node you specify.

If it’s really important to you that this happens automatically, there is a project (avn) which integrates with nvm, and is designed to address this need.

Other nvm Commands

There are other commands nvm provides, which are more of advanced or not common usage.

Running a command directly for an installed version without switching the node variable:

nvm run 4.2.2 --version

Running a command on a sub-shell, targeting a specific version:

nvm exec 4.2.2 node --version

Getting the path to the Node.js executable of a specific installed version:

nvm which 4.2.2

Conclusion

nvm is a great tool for any Node.js developer. It enables a concern free installation and switching between different versions, saving time for what really matters. A thank you note to Tim Caswell the creator of nvm, and Corey Butler for the nvm for windows support, and of course to the contributors of these great projects. Your work is greatly appreciated by the Node.js community.

What about you? Do you use nvm? How has your experience been with it? Would love to hear from you in the comments below.

Was this helpful?

 More:

Command line tools, io.js, node, node version manager, npm, nvm, nvm-windows, quick-tip

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