A method and system for application-to-application data exchange which provides data conversion from the format of a source application to the format of a target application upon receipt of data by the target application. To achieve compatibility among applications exchanging data, the preferred system uses a standard set of terms and process names for building metadata packets that inform both applications as to their respective data representation. A metadata packet includes a standard name and application specific data format, as well as an optional associated process name. Source metadata provided in connection with source application-specific data enables the conversion of the source format to the format compatible with the target. This method eliminates data conversion at the source application.