If you don't understand how the below works, don't move on!

`src/app.js`

...
app.get('/artists/:id', artistControllers.find);
...

`src/controllers/artists.js`

...

exports.find = (req, res) => {
  Artist.findOne({ _id: req.params.id }, (err, artist) => {
    res.status(200).json(artist);
  });
}