Tutorial by Examples

You can install Sinatra as a global gem: gem install sinatra or add it to a project's Gemfile # in Gemfile: gem 'sinatra' and run bundle install.

# app.rb require 'sinatra' get '/' do 'Hello, Universe!' end Install Sinatra: gem install sinatra Run the app: ruby app.rb That's it! Access your app at http://localhost:4567