app.js

import express from 'express';
import dotenv from 'dotenv';

import { router as apiRouter } from './api.js';

dotenv.config();

const {
  PORT: port = 3000,
} = process.env;

const app = express();

app.use(express.json());

app.use(apiRouter);

function notFoundHandler(req, res, next) { // eslint-disable-line
  console.warn('Not found', req.originalUrl);
  res.status(404).json({ error: 'Not found' });
}

function errorHandler(err, req, res, next) { // eslint-disable-line
  console.error(err);

  if (err instanceof SyntaxError && err.status === 400 && 'body' in err) {
    return res.status(400).json({ error: 'Invalid json' });
  }

  return res.status(500).json({ error: 'Internal server error' });
}

app.use(notFoundHandler);
app.use(errorHandler);

app.listen(port, () => {
  console.info(`Server running at http://127.0.0.1:${port}/`);
});