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Haskell Web Development

Servers - Libraries - Frameworks
Deploy - Cloud
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Testing and Verification
Content Management

Community & Research:
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Literature (research, talks and blogs)
Existing Haskell web applications
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Below is a list of known to be active Haskell web frameworks. Rather than one framework to rule them all, Haskell provides several options. You can view the Web/Deploy page to get an idea of how you might deploy an application written in some of these frameworks.

See also: there are also many inactive web frameworks to draw inspiration from

IHP: Integrated Haskell Platform

IHP is a modern batteries-included web framework using haskell and nix. It comes with everything you need to build great web applications out of the box. Combined with the unique mix of technologies and a fast development process, IHP makes it very pleasant to build applications.

The development environment is fully managed, so you don't need to worry about installing GHC, Cabal or other haskell tools. The built-in web server automatically reloads your haskell code, no need to manually recompile your app. Thanks to code generators and it's great documentation you can build real web applications with very basic knowledge of haskell. You will pick up more advanced Haskell along the way!

Notable features:

  • HSX, a JSX-like template language that looks like HTML while providing type safety
  • Auto live reloading without the need to setup anything
  • Documentation with examples: it lets you query the database without learning about monads
  • Type-safe, composable SQL queries
  • Active community that can help you with type errors
  • IHP runs on MacOS, Windows and Linux.
License MIT
Author: digitally induced GmbH and Open Source Contributors
Maintainer: digitally induced GmbH
Home page: https://ihp.digitallyinduced.com/
Documentation: https://ihp.digitallyinduced.com/Guide/
Package & repositories [1]

Join the Gitter Community or the IHP Forum to get help while building your application.


Happstack is a Haskell web framework. Happstack is designed so that developers can prototype quickly, deploy painlessly, scale massively, operate reliably, and change easily. It supports GNU/Linux, OS X, FreeBSD, and Windows environments.

License BSD3
Author: Happstack team, HAppS LLC
Maintainer: Happstack team <happs@googlegroups.com>
Home page: http://happstack.com/
Documentation: http://happstack.com/page/view-page-slug/3/documentation
Package & repositories Hackage - Darcs

Happstack is a complete web framework. The main component is happstack-server: an integrated HTTP server, routing combinators, fileserving, etc. In addition, a number of packages that used to be coupled to Happstack have now been decoupled from it, but remain promoted and documented for use with Happstack:

  • safecopy: datatype serialization and migration support
  • acid-state: a powerful NoSQL ACID storage system with native support for Haskell types

It also includes integration with many 3rd party libraries including:

See the Happstack Home Page for more information and to learn how to get support via IRC and mailing lists.


Snap is a web development framework built around an abstraction called snaplets.

Snap is well-documented and has a test suite with a high level of code coverage. It has been used in production for years, and version 1.0 was released in August 2016. As of July 2017, it does not support HTTP/2.

The framework provides:

  • A fast HTTP server library
  • A sensible and clean monad for web programming
  • A simple, yet powerful template system that supports both HTML5 and XML

Snaplets that come with the framework include functionality for templating, authentication and sessions. Additional functionality (including MySQL and PostgreSQL database access) is provided by third-party snaplets.

License: BSD3
Author: James Sanders, Gregory Collins, Doug Beardsley
Maintainer: snap@snapframework.com
Home page: http://snapframework.com/
Documentation: http://snapframework.com/docs
Package & repositories Hackage - Git


Yesod is designed for RESTful, type-safe, performant web apps. By leveraging quasi-quotation for the more boilerplate tasks, we get concise web apps with high levels of type safety. Its Hamlet templates are compile-time checked for correctness, and the controller (web-routes-quasi) uses type-safe URLs to make certain you are only generating valid URLs. It loosely follows Model/View/Controller principles.

License: BSD3
Author: Michael Snoyman <michael@snoyman.com>
Maintainer: Michael Snoyman <michael@snoyman.com>
Announcement: http://www.haskell.org/pipermail/haskell-cafe/2010-March/074271.html
Home page: http://www.yesodweb.com/
Documentation: http://www.yesodweb.com/book
Screencast: http://www.yesodweb.com/page/screencasts
Package & repositories Hackage - Github

Yesod is a full-featured web framework. It takes a modular approach to development, so many parts of the framework such as Hamlet and Persistent are available as standalone packages. However, put together, Yesod provides you with solutions for templating, routing, persistence, sessions, JSON, authentication/authorization, and more. Yesod's major guiding principle is type safety: if your application compiles, it works.

Yesod is very well documented through a combination of haddocks and the Yesod book.

Yesod is built on WAI, or the Web Application Interface. This is similar to WSGI in Python or Rack in Ruby. It provides a single interface that all applications can target and work on multiple backends. Backends exist for CGI, FastCGI, SCGI, development server (auto-recompile) and even a Webkit-powered desktop version.

But the premier backend is Warp: a very simple web server which, at the time of writing, is the fastest Haskell has to offer. You can read more in its release announcement and see some followup benchmarks. Warp is already powering Yesod; some other major players that are planning a move are Hoogle and Happstack.

You can see a list of Yesod-powered sites and packages, or check out the source code for Haskellers. Most discussions for Yesod take place on the yesodweb list, so feel free to join in and ask any questions you have, the Yesod community is very beginner-friendly.


A web server with a module system and support for CGI. Based on Simon Marlow's original Haskell Web Server.

License: BSD3
Copyright: Simon Marlow, Bjorn Bringert
Author: Simon Marlow, Bjorn Bringert <bjorn@bringert.net>
Maintainer: Henning Thielemann <webserver@henning-thielemann.de>
Packages & repositories Hackage - Darcs


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

Scotty is simple, cheap and cheerful way to write RESTful, declarative web applications. It has good documentation for all the relevant functions.

  • 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 WAI Application interface.
  • Uses very fast Warp webserver by default.
License: BSD3
Author: Andrew Farmer
Maintainer: Andrew Farmer
Home page: https://github.com/scotty-web/scotty
Documentation: http://hackage.haskell.org/package/scotty
Package & repositories Hackage - Git


Miso is a small "isomorphic" Haskell front-end framework featuring a virtual-dom, diffing / patching algorithm, event delegation, event batching, SVG, Server-sent events, Websockets, and an extensible Subscription-based subsystem. Inspired by Elm, Redux and Bobril. IO and other effects (like XHR) can be introduced into the system via the Effect data type. Miso makes heavy use of the GHCJS FFI and therefore has minimal dependencies.

License: BSD3
Author: David Johnson
Maintainer: djohnson.m@gmail.com
Home page: https://github.com/dmjio/miso
Package & repositories Hackage - Git


Servant is a a light-weight framework primarily for REST APIs. It allows to specify API specifications as type aliases and then work with these type aliases to create servers, but also documentation, client code in Haskell and Javascript, etc.. It is based on wai.

License: BSD3
Author: Alp Mestanogullari, Sönke Hahn, Julian K. Arni
Maintainer: alpmestan@gmail.com
Home page: http://haskell-servant.github.io/
Package & repositories Hackage - Git


Another Haskell web framework for rapid development: This toolbox provides everything you need to get a quick start into web hacking with haskell: routing, middleware, json, blaze, sessions, cookies, database helper, csrf-protection, global state

  • Simple API
  • Adds lots of useful features for rapid web development
  • Fast tree based routing
  • Plugins like Spock-auth and Spock-worker
License: BSD3
Author: Alexander Thiemann
Maintainer: Alexander Thiemann
Home page: https://github.com/agrafix/Spock
Documentation: http://hackage.haskell.org/package/Spock
Package & repositories Hackage - Git

See also