US Patent 11463432 Data leakage prevention over application programming interface

A method by a network device for assigning data types to data values included in application programming interface (API) responses sent by an API server to one or more API clients via an API. The method includes obtaining a first set of API responses from an endpoint of the API, generating a profile for the endpoint of the API based on analyzing the first set of API responses, where the profile of the endpoint indicates an expected structure of API responses and expected data types associated with data fields included in API responses, obtaining a second set of API responses, and using the profile of the endpoint of the API to assign data types to data values included in API responses in the second set of API responses.