Abstract: Architecture that facilitates asynchronous error handling of validation failures, which enables rapid editing in web applications without forcing the end user to wait for server responses or interrupting successive edits. A technical infrastructure is provided that tracks changes over time as well as marks and resolves validation failures. A user interface creates and presents visual cues for validation failures on both a row and cell granularity. Cell-level and row-level validation failures are processed as well as contextually relevant errors and messages. The architecture affords for cycling through multiple errors, and hiding error details unless interacted with by the end user. Support is provided for rapid and type safe editing in a web-based environment and for non-blocking validation failures.