Snap (web framework)

The Snap framework consists of the following:

• snap-core,^[5] a generic Haskell web server API.
• snap-server,^[6] a fast^[7] HTTP server that implements the snap-core interface.
• Heist,^[8] 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,^[9] 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.^[10]

Snap runs on both Windows NT and Unix-like platforms. Snap uses the Iteratee input/output (I/O) model,^[11] As of version 1.0, its I/O is implemented with io-streams.

Snap is used by Silk,^[12] JanRain,^[13][14] Racemetric,^[15] Lee Paste's Financial Blog,^[16][17] 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.^[18]

• Yesod (web framework)
• Servant (web framework)
• Scotty^[19]
• Spock^[20]
• MFlow^[21]
• Miso^[22]