Web Reference: Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components. Dec 5, 2025 · This client-side form validation helps ensure data entered matches the requirements set forth in the various form controls. This article leads you through basic concepts and examples of client-side form validation. Input validation is a core requirement of building a secure application. Information received from a user should be treated as untrusted and validated by a trusted application component prior to processing, regardless of whether or not the user providing the input has been successfully authenticated.
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