The York Haskell Compiler Core to Javascript Converter (ycr2js) is aimed to create a tool that generates Javascript out of a binary Yhc core file. The Yhc compiler generally produces a binary bytecode file (usually named with .hbc extension) for each Haskell module compiled. These bytecode files are to be interpreted by yhi, a command-line bytecode interpreter. The ycr2js program reads the binary core file specified (.yca or .ycr), and performs conversion of Haskell functions compiled into Core to their Javascript representation storing the generated Javascript code in a file. Resulting Javascript may be embedded on a (X)HTML page to be loaded into a Web browser.