Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time

Scotty Build Status

A Haskell web framework inspired by Ruby's Sinatra, using WAI and Warp.

{-# LANGUAGE OverloadedStrings #-}
import Web.Scotty

import Data.Monoid (mconcat)

main = scotty 3000 $
    get "/:word" $ do
        beam <- param "word"
        html $ mconcat ["<h1>Scotty, ", beam, " me up!</h1>"]

Scotty is the cheap and cheerful way to write RESTful, declarative web applications.

  • A page is as simple as defining the verb, URL pattern, and Text content.
  • It is template-language agnostic. Anything that returns a Text value will do.
  • Conforms to the web application interface (WAI).
  • Uses the very fast Warp webserver by default.

See examples/basic.hs to see Scotty in action. (basic.hs needs the wai-extra package)

> runghc examples/basic.hs
Setting phasers to stun... (port 3000) (ctrl-c to quit)
(visit localhost:3000/somepath)

As for the name: Sinatra + Warp = Scotty.

More Information

Tutorials and related projects can be found in the Scotty wiki.

Development & Support

Open an issue on GitHub.

Copyright (c) 2012-2019 Andrew Farmer


  • Fails to compile regex-posix on Windows
    • If you are using stack, add the following parameters to stack.yaml:
      •   extra-deps:
          - regex-posix-clib-2.7
              _regex-posix-clib: true
    • If you are using cabal, update the constraints section of cabal.project.local as follows:
      • constraints:
          regex-posix +_regex-posix-clib