Ivarsson, Johan2012-09-212012-09-212012-09-21http://hdl.handle.net/2077/30363This report describes the development and resulting product of a web-based editor for a simple programming language. This language is an extension of simply typed lambda calculus and labelled bracket notation, with a simple type-system. Each editing operation will only construct well-typed programs. The report is written as a basis for someone with some technical knowledge of type-theory and programming, who wants to further develop the application. The application and its source code can be accessed on http://bonzay.se/dev/master.engtext