JAVASCRIPT

Mongoose DELETE

// Delete a user by username
app.delete('/users/:Username', (req, res) => {
  Users.findOneAndRemove({ Username: req.params.Username })
    .then((user) => {
      if (!user) {
        res.status(400).send(req.params.Username + ' was not found');
      } else {
        res.status(200).send(req.params.Username + ' was deleted.');
      }
    })
    .catch((err) => {
      console.error(err);
      res.status(500).send('Error: ' + err);
    });
});

mongoose find by and delete

Campground.findByIdAndRemove(req.params.id, function(err){
      if(err){
          res.redirect("/campgrounds");
      } else {
          res.redirect("/campgrounds");
      }
   });

MONGOOSE delete

Modelname.findOneAndDelete({ id: id })