Abstract: A system and method are provided for emulating the functionality of a web service. The system can include a web server that is configured to host web services. A web service can be configured to execute on the web server as defined by a service definition file. The web service can contain a plurality of executable emulation rules, and the emulation rules can include request argument formats and response formats. An end user can enter values using a graphical user interface for the expected request arguments and response values to be returned by the web service for each executable emulation rule, when the expected request arguments are received.