Validations across multipage form

1. How to validate all fields form in JavaScript?
2. How do you add validation to a form in HTML?

How to validate all fields form in JavaScript?

Basic Validation − First of all, the form must be checked to make sure all the mandatory fields are filled in. It would require just a loop through each field in the form and check for data. Data Format Validation − Secondly, the data that is entered must be checked for correct form and value.

How do you add validation to a form in HTML?

To validate the form using HTML, we will use HTML <input> required attribute. The <input> required attribute is a Boolean attribute that is used to specify the input element must be filled out before submitting the Form.