Sinatra Framework Guide

Applies to: Sinatra 3.x, Ruby 3.0+, REST APIs, Microservices, Prototypes Language Guide: @.claude/skills/ruby-guide/SKILL.md

Overview

Sinatra is a lightweight DSL for building web applications and APIs in Ruby. It maps HTTP verbs directly to Ruby blocks, providing minimal ceremony and maximum flexibility.

Use Sinatra when:

• Building microservices or small-to-medium APIs
• Rapid prototyping or proof-of-concept work
• Lightweight webhooks, proxies, or internal tools
• You want minimal framework overhead

Consider alternatives when:

• You need a full MVC framework (use Rails)
• You need built-in admin, ORM, and auth out of the box (use Rails)
• Application complexity exceeds 10+ route modules (use Rails or Hanami)