How many types of validation have to be implemented to develop a secure form?
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A validation rule can contain a formula or expression that evaluates the data in one or more fields and returns a value of “True” or “False.” When the validation rule returns a value of 'True', this confirms that the data entered by the user contains an invalid value. Validation rules can also include error messages to display to users when they enter invalid values based on specified criteria. Using these rules effectively contributes to quality data. For example, you can ensure that all phone number fields contain a specified format or that discounts applied to certain products never exceed a defined percentage.
During validation, the developer should validate the form at every step, like first validate the form with HTML, then validate it with JavaScript and finally on the server side. This is the best flow of validation that every developer has to follow. Improper submission of the form without verification may inappropriately fill your database.
Why HTML validation :
HTML validation is the basic validation that executes on submission of the form. This validation is client-side so it does not take much time and the response is very fast but these validations are easily removed from the client side. So, after that it is better to go with JavaScript validation
Why JavaScript validation :
JavaScript validations are also client-side validations. These are executed before form submission. They are also client side validation so they are also fast but if the browser doesn't support JavaScript or JavaScript execution has been disabled by the user then that validation will not work. So, you have to go with server side validation as well.
Why Server Side validation :
Server-side verification is the most secure verification that cannot be circumvented in any way on the part of the user. So, server side validation is the best and safest way to validate the form.
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Happy Coding!