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Overview
Sinatra is a lightweight DSL for quickly building web applications in Ruby. Routes, filters, helpers, templates, sessions, streaming, and middleware can be composed as needed, and an application can act as either a Rack endpoint or Rack middleware. Main declares version 4.2.1, and the Sinatra 4 line targets Rack 3.
Features and best fit
Based on official documentation; not hands-on tested · Content checked:
Key features
Map HTTP methods and URL patterns directly to Ruby route blocks
The get, post, put, patch, and delete DSLs define routes with named parameters, wildcards, route conditions, and direct control over response status, headers, and bodies.
Sources: [2]
Compose filters, helpers, templates, and Rack middleware into a small application
Sinatra can add before/after filters, helpers, templates such as ERB, sessions, streaming, static files, and Rack middleware as needed, while Sinatra::Base supports modular applications and reusable components.
Sources: [2]
Best fit
Fits small APIs, internal tools, webhooks, and focused Ruby services
It is useful when a backend should keep HTTP endpoints close to application logic without adopting a large full-stack convention set, or when a small endpoint must be inserted into an existing Rack stack.
Sources: [2]
Before adoption
Sinatra 4 targets Rack 3; treat the server, rackup, and security configuration as explicit dependencies
Main declares version 4.2.1, and the gemspec requires Ruby 2.7.8 or newer plus Rack 3.x. Sinatra 4 dropped Rack 2 support, server startup needs the separate rackup gem, and the README recommends Puma. Rack::Protection, session secrets, and host authorization still need to be configured for the application's threat model.
Official sources
- [1]sinatra/sinatra — GitHub repository(2026-10-06)
- [2]Sinatra — README(2026-10-06)
- [3]Sinatra — sinatra.gemspec(2026-10-06)
- [4]Sinatra — CHANGELOG(2026-10-06)
- [5]Sinatra — MIT License(2026-10-06)
Supplemental curator note
Sinatra is useful for APIs and webhooks that do not need a large full-stack framework and benefit from keeping HTTP routes close to application logic. Sinatra 4 requires Rack 3, so Rack 2 migrations should verify middleware compatibility and the rackup/server setup first.
Try it in 3 steps
- 1
Get the source
git clone --depth 1 https://github.com/sinatra/sinatra.git - 2
Enter the repository
cd sinatra - 3
Check the official steps
Continue with the commands in the README Installation, Quick Start, or Getting Started section.
find . -maxdepth 1 -iname 'README*' -exec sed -n '1,220p' {} \; -quit
Growth
Growth trends · Last 30 days
12,454 Stars
Trend data is still being collected.
Development activity
Last 90 days · weekly
- Commits (last 30 days)
- 0
- Open PRs
- 21
Development activity is still being collected.
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Categories and tags
GitHub data
GitHub dataView detailed GitHub data
GitHub Topics
- ruby
- rack
- web-framework
- sinatra
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