application-security
Input Validation
Input Validation
Definition
Input validation ensures that data supplied by users or external systems conforms to expected types, formats, lengths, and ranges before processing. It is the first line of defense against injection attacks, buffer overflows, and business logic exploits.
Validation should be performed server-side (never trusting client-side only), using allowlists that define acceptable input rather than denylists of known bad input.
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