What type of input validation checks if data is the correct length?

The type of input validation that checks if data is the correct length is known as a length check. This validation process ensures that the inputted data meets specific requirements regarding the number of characters or digits it contains. For example, if a user is required to enter a password with a minimum of 8 characters, a length check will verify that the inputted password is not shorter than this specified length.

This form of validation is crucial for maintaining data integrity, ensuring compliance with required data specifications, and preventing errors that could occur if inputs are too short or too long. Length checks are particularly useful in scenarios where a certain length is essential for processing or storage, such as when entering user IDs, phone numbers, or specific codes.

In contrast, other types of validation like syntax checks focus on whether the input follows the correct structure (such as checking for valid email formats), logic checks assess whether the data makes sense in context (like ensuring an age is within a realistic range), and format checks ensure the input adheres to a specific template or structure (such as dates being formatted as DD/MM/YYYY). These checks serve different purposes beyond simply evaluating input length.