code: def register():
      
  
      if _security.confirmable or request.is_json:
          form_class = _security.confirm_register_form
      else:
          form_class = _security.register_form
  
      if request.is_json:
          form_data = MultiDict(request.get_json())
      else:
          form_data = request.form
  
      form = form_class(form_data)
  
      if form.validate_on_submit():
          user = register_user(**form.to_dict())
          form.user = user
  
          if not _security.confirmable or _security.login_without_confirmation:
              after_this_request(_commit)
              login_user(user)
  
          if not request.is_json:
              if 'next' in form:
                  redirect_url = get_post_register_redirect(form.next.data)
              else:
                  redirect_url = get_post_register_redirect()
  
              return redirect(redirect_url)
          return _render_json(form, include_auth_token=True)
  
      if request.is_json:
          return _render_json(form)
  
      return _security.render_template(config_value('REGISTER_USER_TEMPLATE'),
                                       register_user_form=form,
                                       **_ctx('register'))
docs: View function which handles a registration request.