Methods and systems for use in validating input data in a computing system. Input data associated with a destination software application, such as a database, is received at a computing system. The input data is forwarded to an intermediate software application, such as a web application. When the input includes one or more patterns, a query produced by the intermediate software application based on the input data is validated, such as by comparing the structure of the query to one or more expected query structures. If the validation succeeds, the query is forwarded to the destination software application. Otherwise, the query is discarded.