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Snap project starter executable plus some libraries for building web apps
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Snap Framework

Snap is a simple and fast web development framework and server written in Haskell. For more information about Snap, read the or visit the Snap project website at

Library contents

This is top-level project for the Snap Framework, which contains:

  • a library allowing Snap applications to recompile actions on the fly in development mode, with no performance loss in production mode.

  • a "snaplet" API allowing web applications to be build from composable pieces.

The command-line utility snap for creating initial Snap applications used to be a part of this package. Since version 1.0, it is provided by the package snap-template.

Building snap

The snap library is built using Cabal and Hackage. Just run

cabal install

from the snap toplevel directory.

Building the Haddock Documentation

The haddock documentation can be built using 'cabal haddock'.

The docs get put in dist/doc/html/.

Building the testsuite

To build the test suite, run

$ cabal clean
$ cabal configure --enable-tests --enable-library-coverage
$ cabal build
$ cabal install --enable-tests

From here you can invoke the testsuite by running:

$ ./

The testsuite generates an hpc test coverage report in dist/hpc.

Roadmap to Understanding Snaplets

  1. Read Tutorial.lhs which is in the project_template/tutorial/src directory of the snap-template package.
  2. Generate and read the haddock docs.
  3. The test code has the nice property that it actually functions as a pretty good example app and covers a lot of the use cases.
  4. If you're interested in the implementation, read
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