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Kemal Build Status

Join the chat at https://gitter.im/sdogruyol/kemal crystal-docs.org

Lightning Fast, Super Simple web framework for Crystal. Inspired by Sinatra but with superior performance and built-in WebSocket support.

Super Simple

require "kemal"

# Matches GET "http://host:port/"
get "/" do
  "Hello World!"
end

# Creates a WebSocket handler.
# Matches "ws://host:port/socket"
ws "/socket" do |socket|
  socket.send "Hello from Kemal!"
end

Kemal.run

Start your application!

crystal src/kemal_sample.cr

Go to http://localhost:3000

Check documentation or samples for more.

Super Fast 🚀

Numbers speak louder than words.

Framework Request Per Second Avg. Response Time
Kemal (Production) 100238 395.44μs
Sinatra (Thin) 2274 43.82ms

These results were achieved with wrk on a Macbook Pro Late 2013. (2Ghz i7 8GB Ram OS X Yosemite)

Installation

Add this to your application's shard.yml:

dependencies:
  kemal:
    github: kemalcr/kemal
    branch: master

Features

  • Support all REST verbs
  • Websocket support
  • Request/Response context, easy parameter handling
  • Middlewares
  • Built-in JSON support
  • Built-in static file serving
  • Built-in view templating via Kilt

Documentation

You can read the documentation at the official site kemalcr.com

Thanks

Thanks to Manas for their awesome work on Frank.