This is Package that will help you to set custom validation at server side.
Import a dummy database. Use mydb.sql file for that.
I have create one class file that is validation.php You can use that class for a validate your request parameters. Simply put a validate rule array and request array into method and that will check your validations for your request.
// convert to array
$request_data = json_decode($json_request,true);
// create a rule array
$rules = array(
"first_name"=>"required",
"last_name"=>"required",
"age"=>"required|integer",
"email"=>"email|unique:user_details",
"contact"=>"required|contactNumber",
"gender"=>"required"
);
// check a validation using a validation class method.
$isValid = $this->checkValidation($request_data,$rules);