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How to install Node.js 8 on centos7

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Node.js 8 Installation on centos7

Node.js is an open source, cross-platform runtime environment for developing server-side and networking applications. Node.js applications are written in JavaScript, and can be run within the Node.js runtime on mac os, Microsoft Windows, and Linux.Node.js also provides a rich library of various JavaScript modules which simplifies the development of web applications using Node.js to a great extent.

Installation

Download the node packages.

Use the Following command to download the node packages from the url.

[root@linuxhelp11 ~]# curl -sL https://rpm.nodesource.com/setup_8.x | sudo -E bash –
##Installing the NodeSource Node.js 8.x repo...
##Inspecting system...
+ rpm -q --whatprovides redhat-release || rpm -q --whatprovides centos-release || rpm -q --whatprovides cloudlinux-release || rpm -q --whatprovides sl-release
+ uname –m
.
.
.
+ rpm -qa 'node|npm' | grep -v nodesource

##Run `sudo yum install -y nodejs` to install Node.js 8.x and npm.
##You may also need development tools to build native addons:
     sudo yum install gcc-c++ make
##To install the Yarn package manager, run:
     curl -sL https://dl.yarnpkg.com/rpm/yarn.repo | sudo tee /etc/yum.repos.d/yarn.repo
     sudo yum install yarn

Next you can use the following command to install the node packages.

[root@linuxhelp11 ~]# yum install -y nodejs
Loaded plugins: fastestmirror, langpacks
base                                                            | 3.6 kB  00:00:00     
extras                                                          | 3.4 kB  00:00:00     
nodesource                                                      | 2.5 kB  00:00:00     
updates                                                         | 3.4 kB  00:00:00     
(1/5): nodesource/x86_64/primary_db                             | 7.6 kB  00:00:01    
.
.
.
Warning: RPMDB altered outside of yum.
  Installing : 2:nodejs-8.12.0-1nodesource.x86_64                                  1/1 
  Verifying  : 2:nodejs-8.12.0-1nodesource.x86_64                                  1/1 

Installed:
  nodejs.x86_64 2:8.12.0-1nodesource                                                   

Complete!

To verify the version of the node use the Following command

[root@linuxhelp11 ~]# node -v
V8.12.0

With this The method to install Node.js 8 on centos7 comes to an end.

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Frequently asked questions ( 5 )

Q

Why is Node.js Single-threaded?

A

Node.js is single-threaded for async processing. By doing async processing on a single-thread under typical web loads, more performance and scalability can be achieved as opposed to the typical thread-based implementation.

Q

Which kind of database can be used for Node.js?

A

Just like with hosting providers, Node.js can work with any database, both NoSQL such as MongoDB and SQL ones

Q

What is callback hell in Node.js?

A

Callback hell is the result of heavily nested callbacks that make the code not only unreadable but also difficult to maintain

Q

What is the role of REPL in Node.js?

A

As the name suggests, REPL (Read Eval print Loop) performs the tasks of – Read, Evaluate, Print and Loop. The REPL in Node.js is used to execute ad-hoc Javascript statements. The REPL shell allows entry to javascript directly into a shell prompt and evaluates the results. For the purpose of testing, debugging, or experimenting, REPL is very critical.

Q

Where the Node.js will be used?

A

Node.js is used to build scalable programs especially web applications which are computationally simple but are frequently accessed

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