Iphone Notification

Hello all, i know this is not the correct place may be it is to ask for a little help. I have an Iphone 6. I need to know how do i get only message notifications rather than the content in it for messenger and whatsapp.
Please advice anyone?.
I have looked in to the settings but no success as yet.

You should be able to turn off notification previews in the settings. You just want it to show that you have a notification from Whatsapp, but not the actual text right?

Yes i can