Visual debugger for declarative/data-flow applications

A framework is implemented. The framework is configured to execute an application within the framework, the application includes instantiated runtime objects. New instantiated runtime objects may be created and instantiated runtime objects destroyed while the application is executing. The framework is further configured to implement a debugger within the framework. At the debugger, instantiated runtime objects are correlated with lines of code of the application. Some embodiments allow users to debug executing applications. This can be accomplished by a user interacting with the executing application which then causes indications in the debugger or interacting with the debugger and which causes indications on instantiated runtime objects in the application.