This class used for error message of form input. Below are the different examples of bootstrap forms validation: The following example is Validation with the horizontal form. Bootstrap did all things in one form page avoiding complications and lengthy coding and control the form data effortlessly. Bootstrap form validation provides some actionable and valuable feedback to users. Form controls automatically receive some global styling with Bootstrap: All textual ,
React and
Error validation class placed in parent class with a has-feedback class. There is no class in the form.