Validator

A validator is a component or tool that checks the validity or correctness of input, code, data, or documents according to a specific set of rules or standards. Validators are essential for ensuring that everything from web pages and databases to software applications and digital documents adheres to the required format, structure, syntax, and content. They are used to identify errors and inconsistencies early on in the development process, which helps to save time and resources by preventing issues from persisting into later stages. Validators can be built into software development environments, web development frameworks, and content management systems, or they can be standalone tools that are used to validate files or data before they are uploaded or submitted.