FJAX is a programming language for the implementation of asynchronous web applications. This functional language was developed at the University of Maryland and facilitates server-generated content that can be updated without the need to reload the page. FJAX incorporates familiar web technologies including HTML, JavaScript, and XML to create interactive interfaces with enhanced user experiences. Its syntax has been described as similar to OCaml in its type handling and pattern matching capabilities, which helps in writing robust code that can handle complex asynchronous operations efficiently.