MongooseError: Model.find() no longer accepts a callback

The use of callback functions has been deprecated in the latest version of Mongoose.

we need to use either Promises or async/await syntax.

Particularly if Model.find throws an error then we can replace it as follows.

Model.find().then((err, data) => {
        if(err){
            return res.send(err)
        }
            return res.json(data)
    });