There are several types of form validation

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Client-side validation is a browser-side data check. Its purpose is to warn the user about an error immediately, without having to send data to the server. Such validation is often used for the following tasks:
Checking if required fields are empty;
Format checks (e.g. checking for correct email format);
Checking the minimum and maximum number of characters.
The benefits of client-side validation are obvious: it makes data entry more convenient and reduces the load on the server, since errors are detected on the user side.
Server Validation
Server-side validation is buy bulk sms bahrain performed after the data has been sent. It is a more reliable method, as it allows for complex checks to be processed and protects against malicious data. Server-side validation is used for tasks such as:
Checking the uniqueness of data, such as email or login;
Check for special characters and other dangerous data;
Applying business logic to submitted data (e.g. checking that the order amount does not exceed the available limit).
Even with client-side validation, data should always be validated on the server, as a user can bypass client-side validation.
form validation
Main types of form validation
depending on what data needs to be checked.
Format validation
Format validation is applied to fields where it is important to adhere to a certain input standard. Examples:
The email address must contain the @ sign and a domain;
Phone number - must match a specific mask, for example, +7 (999) 123-45-67;
Date - must be in the format dd.mm.yyyy.