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Application & OT Security · Intermediate

API Schema Validation

Rejecting API requests and responses that do not conform to a defined schema such as OpenAPI or JSON Schema.

Definition

Schema validation enforces types, required fields, lengths, formats and disallowed extra properties at the gateway or application. It blocks malformed input, mass assignment attempts and excessive data exposure in responses.

Example

The gateway rejects a request containing an unexpected 'isAdmin' property not in the OpenAPI schema.

Exam tip

A positive security model for APIs; complements but does not replace authorization checks.

Related terms