Boss Machine project - Cannot GET / error

Hi everyone, since i started Boss machine project I can’t make it work. I don’t know if there is sth missing but not even with postman or the test i can’t get anything back from the server, here’s my code:

const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');

const app = express();

module.exports = app;

/* Do not change the following line! It is required for testing and allowing
*  the frontend application to interact as planned with the api server
*/
const PORT = process.env.PORT || 4001;

// Add middleware for handling CORS requests from index.html
app.use(cors());

// Add middware for parsing request bodies here:
app.use(bodyParser.json());

// Mount your existing apiRouter below at the '/api' path.
const apiRouter = require('./server/api');
app.use('/api', apiRouter);

// This conditional is here for testing purposes:
if (!module.parent) { 
  // Add your code to start the server listening at PORT below:
  app.listen(PORT, () => {
    console.log(`Your server is listening on port ${PORT}`);
  });
}

api.js:

const express = require('express');
const apiRouter = express.Router();

const minions = require('./minions');


apiRouter.get('/minions', minions);


module.exports = apiRouter;

minions.js:

const express = require('express');
const db = require('./db');
const minionsRouter = express.Router();

const { 
  addToDatabase,
  getAllFromDatabase,
  getFromDatabaseById,
  updateInstanceInDatabase,
  deleteFromDatabasebyId,
} = require('./db');

minionsRouter.param('minionId', (req, res, next, id) => {
  const minion = getFromDatabaseById('minions', id);
  if (minion) {
    req.minion = minion;
    next();
  } else {
    res.status(404).send();
  }
});

// GET all minions
minionsRouter.get('/', (req, res, next) => {
  const allMinions = getAllFromDatabase('minions');
  res.status(200).send(allMinions);
});

// Create a new minion and save it to the database
minionsRouter.post('/', (req, res, next) => {
  const newMinion = addToDatabase('minions', req.body);
  res.status(201).send(newMinion);
})

// GET an specific minion
minionsRouter.get('/:minionId', (req, res, next) => {
  res.send(req.minion);
});

// Update an existing minion
minionsRouter.put('/:minionId', (req, res, next) => {
  const minionUpdated = updateInstanceInDatabase('minions', req.body);
  res.status(204).send(minionUpdated);
});

// DELETE an specific minion
minionsRouter.delete('/:minionId', (req, res, next) => {
  const minionDeleted = deleteFromDatabasebyId('minions', req.params.minionId);
  if (minionDeleted) {
    res.status(204);
  } else {
    res.status(500);
  }
  res.send();
});

module.exports = minionsRouter;

nevermind, already solved it