Node.js

The Javascripts.

Installation

Installation on CentOS

dnf module install nodejs:18/common

Troubleshooting: “The operation would result in switching of module ‘nodejs’ stream ‘10’ to stream ‘18’“

• This might happen because your CentOS enables the nodejs 10 module by default, even if you’ve not already installed it.
• dnf module list --enabled should confirm this.

Installation on Fedora

To install both npm and Node.js, run:

$ sudo dnf install nodejs

To install additional modules from Fedora repositories:

$ sudo dnf install nodejs-<module-name>

Versions

Node takes a unique approach to versioning, so its version history goes something like this:

• 0.12.x
• 4.0.0 (September 2015) - this version jump marked the incorporation of io.is into Node.js.
• 5.0.0 (October 2015)
• 6.0.0 (April 2016)
• 7.0.0 (October 2016)
• 8.0.0 (May 2017)
• 9.0.0 (October 2017)

Managing versions using nvm

Get the current Node version:

$ node -v
v0.10.45
$ nvm current
v0.10.45

Show all installed versions using nvm:

$ nvm ls
->     v0.10.45
         v8.1.2
default -> v0.10 (-> v0.10.45)
node -> stable (-> v8.1.2) (default)
stable -> 8.1 (-> v8.1.2) (default)
iojs -> N/A (default)

Switch to a different version using nvm:

$ nvm use 8.1
Now using node v8.1.2 (npm v5.0.3)

Fundamentals

Using modules

• Node.js uses CommonJS syntax by default.
• This means it uses the require/module.exports syntax, and doesn’t support export (ES6 syntax).

Troubleshooting