throw new MongooseError('Model.prototype.save() no longer accepts a callback'); ....... Fixing use then and catch instead of use if and else method

[UmitRock]

use new code of register post

app.post("/register", function(req, res) { const newUser = new User({ email: req.body.username, password: req.body.password });

newUser.save().then(function(){ res.render("secrets"); }).catch(function (err){ console.log(err); }); });

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instead of old code of register post

app.post("/register", function(req, res){ const newUser = new User({ email: req.body.username, password: req.body.password }); newUser.save(function(err){ if (err) { console.log(err); } else { res.render("secrets"); } }); });