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Learn how to use JavaScript to check and manipulate HTML form elements, and how to provide feedback to the user based on the validation results.

However, sometimes you may want to manipulate the form elements or the data they contain using JavaScript, for example, to validate, modify, or enhance the user experience.

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Vest is a new framework-agnostic form validation library that separates the validation logic from the feature logic while using a unit testing syntax style that is similar to Mocha and Jasmine.

Of all the hats JavaScript can wear, its form-processing features are among the most sought and used. Learn how to use JavaScript for form processing, validation, and more.