A system, method, and computer program product for building JSON message relationships for offline operation of an enterprise application is presented. The claimed embodiments address the problem of mobile application behavior during periods of limited access to backend application services and data. More specifically, some embodiments are directed to approaches for capturing request and response information communicated between a client device and application server when connected by a network, and storing respective relationships using the captured information. The stored requests and responses and respective relationships are used to emulate the backend services provided by the application server when the client device is disconnected from the network. In one or more embodiments, a crawler on the client device can generate simulated online requests to build a set of information for use by the emulator when the client device is disconnected from the application server.