Snap (web framework)

Snap is a web framework for developing web applications written in the functional programming language Haskell.

The Snap framework consists of the following:

• snap-core, a generic Haskell web server API.
• snap-server, a fast HTTP server that implements the snap-core interface.
• Heist, an HTML-based templating system for generating pages that allows you to bind Haskell functionality to HTML tags for a clean separation of view and backend code, much like Lift's snippets. Heist is self-contained and can be used independently.
• Snaplets, a high-level system for building modular web applications.
• Built-in snaplets for templating, session management, and authentication.
• Third party snaplets for features including file uploads, database connectivity (PostgreSQL, MongoDB, etc.), generation of JavaScript from Haskell code, and more.
• The Snap monad for stateful access to HTTP requests and responses.

Snap runs on both Windows NT and Unix-like platforms. Snap uses the Iteratee input/output (I/O) model, As of version 1.0, its I/O is implemented with io-streams.

Snap is used by Silk, JanRain, Racemetric, Lee Paste's Financial Blog, SooStone Inc, and Group Commerce. Snap is also used as a lightweight, standalone Haskell server. The static site generator Hakyll uses Snap for its preview mode.

• Yesod (web framework)
• Servant (web framework)
• Scotty
• Spock
• MFlow
• Miso

• Official website
• Snap Framework on GitHub