Web/Frameworks

Haskell Web Development Software: Servers - Libraries - Frameworks Deploy - Cloud Interfaces to frameworks Databases and Persistence Testing and Verification Content Management Community & Research: Forums and Discussion Literature (research, talks and blogs) Existing Haskell web applications Ongoing projects and ideas

Content from Web should be merged here.

Below is a list of known to be active Haskell web frameworks.

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

Happstack

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/index.html
Documentation:	http://happstack.com/docs
Package & repositories	Hackage - Darcs

Snap

Snap is a simple web development framework for unix systems, written in the Haskell programming language.

Snap is well-documented and has a test suite with a high level of code coverage, but it is early-stage software with still-evolving interfaces. Snap is therefore likely to be most appropriate for early adopters and potential contributors.

• A fast HTTP server library with an optional high-concurrency backend using the libev event loop library
• A sensible and clean monad for web programming
• An XML-based templating system for generating HTML

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

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://docs.yesodweb.com/yesod/
Screencast:	http://www.youtube.com/watch?v=BEWJnDgrmp0
Package & repositories	Hackage - Github

Haskell on a Horse

Haskell on a Horse (HoH) is a combinatorial web framework for the programming language Haskell. It is currently at an early, unsettled stage of development. It is available under the "BSD3" open-source license.

License	BSD3
Author	Jason Hart Priestley
Maintainer	jason@on-a-horse.org
Home page:	http://haskell.on-a-horse.org/
Package & repositories	Hackage

loli

A simple library for fast web prototyping in Haskell.

License	BSD3
Author	Wang, Jinjing
Maintainer	Wang, Jinjing <nfjinjing@gmail.com>
Package & repositories	Hackage - Github

Lemmachine

Lemmachine is a REST'ful web framework that makes it easy to get HTTP right by exposing users to overridable hooks with sane defaults. The main architecture is a copy of Erlang-based Webmachine, which is currently the best documentation reference (for hooks & general design).

Lemmachine stands out from the dynamically typed Webmachine by being written in dependently typed Agda. The goal of the project is to show the advantages gained from compositional testing by taking advantage of proofs being inherently compositional. See proofs for examples of universally quantified proofs (tests over all possible input values) written against the default resource, which does not override any hooks.

More information

Author	Larry Diehl
Packages & repositories	Github

mohws

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

Salvia

Salvia is a feature rich modular web server and web application framework that can be used to write dynamic websites in Haskell. From the lower level protocol code up to the high level application code, everything is written as a Salvia handler. This approach makes the server extremely extensible. To see a demo of a Salvia website, please see the salvia-demo package.

All the low level protocol code can be found in the salvia-protocol package, which exposes the datatypes, parsers and pretty-printers for the URI, HTTP, Cookie and MIME protocols.

This Salvia package itself can be separated into three different parts: the interface, the handlers and the implementation. The interface module defines a number of type classes that the user can build the web application against. Reading the request object, writing to the response, or gaining direct access to the socket, all of these actions are reflected using one type class aspect in the interface. The handlers are self contained modules that implement a single aspect of the Salvia web server. The handlers expose their interface requirements in their type context. Salvia can have multiple implementations which can be switched by using different instances for the interface type classes. This package has only one implementation, a simple accepting socket loop server. The salvia-extras package has two additional implementations. Keeping a clear distinction between the abstract server aspects and the actual implementation makes it very easy to migrate existing web application to different back-ends.

License:	BSD3
Author:	Sebastiaan Visser
Maintainer:	sfvisser@cs.uu.nl
Announcement:	http://www.haskell.org/pipermail/haskell-cafe/2010-March/074870.html
Package & repositories	Hackage - Git