Express (MiddleWare & Router)

Router

---

Request Types:
GET/POST/PATCH/DELETE

GET (fetching data):

app.get('/api/v1/tours', (req, res) => {
  res.status(200).json({
    status: 'success',
    results: tours.length,
    data: {
      tours: tours,
    },
  });
};

POST (create new data):

app.post('/api/v1/tours', (req, res) => {
  const newId = tours[tours.length - 1].id + 1;
  //Getting the last ID number + 1
  
  const newTour = Object.assign({ id: newId }, req.body);

  tours.push(newTour);

  fs.writeFile(
    `${__dirname}/dev-data/data/tours-simple.json`,
    JSON.stringify(tours),
    (err) => {
      res.status(201).json({
        status: 'success',
        data: {
          tour: newTour,
        },
      });
    }
  );
};

PATCH (Edit Data):

app.patch('api/v1/tours/:id', (req, res) => {
  const id = req.params.id * 1;
  const tour = tours.find((tour) => tour.id === id);

  if (!tour) {
    return res.status(404).send({
      status: 'fail',
      message: 'Invalid ID',
    });
  }

  const updatedTour = { ...tour, ...req.body };
  const updatedTours = tours.map((tour) =>
    tour.id === updatedTour.id ? updatedTour : tour
  );

  fs.writeFile(
    `${__dirname}/dev-data/data/tours-simple.json`,
    JSON.stringify(updatedTours),
    (err) => {
      res.status(200).send({
        status: 'success',
        data: updatedTour,
      });
    }
  );
};

:id URL parameter

DELETE (Delete Data)

app.delete('/api/v1/tours/:id', (req, res) => {
  const id = req.params.id * 1;
  const tour = tours.find((tour) => tour.id === id);

  if (!tour) {
    return res.status(404).send({
      status: 'fail',
      message: 'Invalid ID',
    });
  }

  res.status(204).json({
    status: 'success',
    data: null,
  });
};

---

Refactor Routes

Make each request types into a function and use app.route('...').get('...').post('...') etc.

Ex):

const getAllTours = (req, res) => {
  res.status(200).json({
    status: 'success',
    results: tours.length,
    data: {
      tours: tours,
    },
  });
};

const createTour = (req, res) => {
  const newId = tours[tours.length - 1].id + 1;
  const newTour = Object.assign({ id: newId }, req.body);

  tours.push(newTour);

  fs.writeFile(
    `${__dirname}/dev-data/data/tours-simple.json`,
    JSON.stringify(tours),
    (err) => {
      res.status(201).json({
        status: 'success',
        data: {
          tour: newTour,
        },
      });
    }
  );
};

app.route('/api/v1/tours').get(getAllTours).post(createTour);

const getSpecificTour = (req, res) => {
  console.log(req.params);
  const id = req.params.id * 1;
  const tour = tours.find((el) => el.id === parseInt(req.params.id));
  const num_tours = tours.length;

  if (!tour) {
    return res.status(404).json({
      status: 'fail',
      message: 'Invalid ID',
    });
  }

  res.status(200).json({
    status: 'success',
    data: {
      tour: tour,
    },
  });
};

app.route('/api/v1/tours/:id').get(getSpecificTour);

Middleware declaration:
Ex)

app.use(express.json()); 

app.use((req, res, next) => {
  req.requestTime = new Date().toISOString();
  next();
  //next() is REQUIRED
});