In one embodiment, a method receives a specification for aggregating data from processing of beacons. A beacon is associated with an event occurring at a client while a user is interacting with a web application and including unstructured data. The method then parses the specification to automatically generate an aggregation to aggregate structured data that has been converted from the unstructured data and stores dependency information for changes to the aggregation. State information is analyzed and the dependency information to determine when a change in the state information indicates that a change should be made to the aggregation. The method then dynamically changes the aggregation based on the analyzing to generate a new aggregation to aggregate different data based on changed information.