This project shows API along with RAILS web application Ruby also gives an option to have API-only application, read more at - https://guides.rubyonrails.org/api_app.html

Includes usage of -

• API for CRUD operations
• SQLite database
• Model level validation
• API response with status codes and messages

For reference -

• Create project command - rails new rails_api

• Create user model command - rails g model User first_name last_name age email password:digest

• Create user controller command - rails g controller User

• Migrate db command- rake db:migrate

• Add resources in route.rb

• Check routes created command - rake routes

• disable CSRF protection, when API request doesn't have HTML form add in ApplicationController - protect_from_forgery with: :null_session