Easy steps to install cfn-format package on Mac
Package Information:
Application Name – cfn-format
What is cfn-format – Not Available for cfn-format
Use of cfn-format – Command-line tool for formatting AWS CloudFormation templates
URL – https://github.com/aws-cloudformation/rain
Installation Steps:
- Open Terminal using Spotlight search by pressing 
<command+space>. Type terminal and hitEnterkey. - Now, run following command to install homebrew (brew)
 - Install cfn-format using brew
brew install cfn-format
 

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

cfn-format is ready to use now!