This type of validation allows you to check whether

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Format validation makes it easier for the user to enter data and ensures that the data is accepted by the server without errors.
Checking required fields
This is a basic check to ensure that important form fields are not left blank. Required fields are often marked with an asterisk and are key to processing an application or action on the site.
Checking ranges of values

If your form requires numeric data, such as age or quantity, it's a good idea to limit the allowed values. For example, age can't be greater than 150 or less than 0, and the number of items in the cart can't exceed what's available in stock.
Checking the uniqueness of data
the value entered by the user buy bulk sms saudi arabia already exists in the database. An example is checking the uniqueness of an email or login during registration. Uniqueness protects against errors and avoids duplication of information.
Security check

This validation protects against malicious data that may be entered into a form field. It is important to filter data to protect against SQL injections, XSS attacks, and other security threats. This is especially important for sites where users enter sensitive data.
form validation
Benefits of Proper Form Validation

Improving user experience
Validation of forms with feedback helps the user avoid errors when entering. For example, if the "phone number" field requires a certain format, the error will appear immediately, even before the form is submitted. This saves the user time and improves the convenience of working with the form.