What is a Validator Function?

A validator function refers to a software component or routine that checks the validity, correctness, or compliance of data or input with predefined rules or criteria. Validator functions are commonly used in software development to ensure that data entered by users or received from external sources meets specific requirements and constraints. For example, a validator function for an email address may verify that the input follows the proper email format, containing “@” and a domain name. Validator functions are critical for data integrity and security in applications and systems.