//Router file. After doing all your imports at beginning of file
const router = express.Router();
app.use('/pathforpostrequests', router);

router.get('/:name', controller.getPerson, (req, res, next) => {
  res.status(200).json(res.locals.person);
});

// Controller file. After doing all your imports at beginning of file. Person is an example mongo schema you will need to setup in a schema file.
const controller = {
  getPerson (req, res, next) {
    Person.findOne({ firstName: req.params.name }).exec()
    .then((result) => {
    res.locals.person = result;
    next();
    })
  },
}