Title: Interfacing Haskell and Google Web Toolkit via JavaScript Object Notation

Abstract: During the course of our work we came across the need to create a system which had a Haskell back-end and a web-based front-end. Using the Google Web Toolkit (GWT) we can quickly create such a front-end. However, interfacing between Haskell data types and Java classes (GWT is implemented in Java) is problematic. To solve the problem we are going to make use of JavaScript Object Notation (JSON) as a means of communication between the two different technologies.