What is format and logical control in API?

Format and logical control in API is the verification of incoming data for compliance with a specific format and logical rules before processing.

• Format control checks that data has the correct type, structure, length, for example, that the "email" field contains a string in email format, and the date is in ISO format.
• Logical control verifies the internal consistency of data, for example, that the start date is not later than the end date, or that the sum of parts equals the total sum.

Example: when creating an order, the API will check that fields are filled correctly (format), and that the quantity of goods is non-negative, and the order total equals the sum of the item prices (logic).

This helps prevent errors and incorrect data at an early stage, improving the quality and reliability of the API.