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Sinatra is a minimalist Ruby web framework that focuses on simplicity and flexibility, letting developers define web applications in just a few lines of code. Its DSL maps routes directly to Ruby blocks, making it straightforward to build APIs, small services, and quick prototypes without the overhead of full-stack frameworks like Rails. Despite its simplicity, Sinatra supports middleware, templates, sessions, filters, and helpers, so it can grow with more complex requirements. The framework is Rack-based, which means it is highly compatible with the Ruby web ecosystem and can plug into larger applications as a lightweight component. Because of its low footprint, it’s ideal for microservices, command-line dashboards, and educational projects.
Features
- Routing via HTTP verbs (GET, POST, PUT, DELETE, PATCH, OPTIONS etc) with named and wildcard parameters
- Template rendering with support for many template engines (ERB, Haml, Slim, Markdown, Liquid, etc.)
- Filters (before / after) and helpers for common request/response logic
- Static file serving, with configuration for public folder, static headers, cache control etc.
- Error handling, lifecycle events, environment configurations (development/production/test)
- Middleware integration: can use Rack middleware, modular or classic style apps, mounting, etc.
Project Samples
