How to use winston

// Main logix
Promise.fromNode(cb => {
 api.listen(config.LANDO_METRICS_PORT, cb);
})
.then(() => {
 log.info('Listening on port: %s', config.LANDO_METRICS_PORT);
});

router.post('/books/add', async (req, res) => {
 try {
  const book = await Book.add({ userId: req.user.id, ...req.body });
  res.json(book);
 } catch (err) {
  logger.error(err);
  res.json({ error: err.message || err.toString() });
 }
});

createPool()
 .then(async (pool) => {
  await ensureSchema(pool);
  return pool;
 })
 .catch((err) => {
  logger.error(err);
  process.exit(1);
 })

/*
 * Post new meta data for metrics.
 */
api.post('/metrics/v2/:id', handler((req, res) => {
 return Promise.map(plugins, plugin => {
  const reporter = new plugin.Reporter(config[plugin.config]);
  return reporter.ping()
   .then(() => reporter.report(_.merge({}, req.body, {instance: req.params.id})))
   .then(() => log.info('Reported to %s', plugin.name))
   .then(() => reporter.close());
 });
}));

app.use(async (req, res, next) => {
 if (pool) {
  return next();
 }
 try {
  pool = await poolPromise;
  next();
 }
 catch (err) {
  logger.error(err);
  return next(err);
 }
});

router.post('/books/add', async (req, res) => {
 try {
  const book = await Book.add(Object.assign({ userId: req.user.id }, req.body));
  res.json(book);
 } catch (err) {
  logger.error(err);
  res.json({ error: err.message || err.toString() });
 }
});

// Start listening
Promise.fromNode(cb => {
 api.listen(config.LANDO_API_PORT, cb);
})
// Load our routes
.then(() => {
 fs.readdirSync(path.join(__dirname, 'routes')).map(file => {
  require(`./routes/${file}`)(api, handler, {config, slack});
  log.info('Loaded route %s', file);
 });
 log.info('Listening on port: %s', config.LANDO_API_PORT);
});

router.post('/books/add', async (req, res) => {
 try {
  const book = await Book.add({ userId: req.user.id, ...req.body });
  res.json(book);
 } catch (err) {
  logger.error(err);
  res.json({ error: err.message || err.toString() });
 }
});

router.post('/books/add', async (req, res) => {
 try {
  const book = await Book.add(Object.assign({ userId: req.user.id }, req.body));
  res.json(book);
 } catch (err) {
  logger.error(err);
  res.json({ error: err.message || err.toString() });
 }
});

router.post('/books/add', async (req, res) => {
 try {
  const book = await Book.add(Object.assign({ userId: req.user.id }, req.body));
  res.json(book);
 } catch (err) {
  logger.error(err);
  res.json({ error: err.message || err.toString() });
 }
});

router.post('/books/add', async (req, res) => {
 try {
  const book = await Book.add(Object.assign({ userId: req.user.id }, req.body));
  res.json(book);
 } catch (err) {
  logger.error(err);
  res.json({ error: err.message || err.toString() });
 }
});

// Main logix
Promise.fromNode(cb => {
 api.listen(config.LANDO_METRICS_PORT, cb);
})
.then(() => {
 log.info('Listening on port: %s', config.LANDO_METRICS_PORT);
});

router.post('/books/add', async (req, res) => {
 try {
  const book = await Book.add(Object.assign({ userId: req.user.id }, req.body));
  res.json(book);
 } catch (err) {
  logger.error(err);
  res.json({ error: err.message || err.toString() });
 }
});

router.post('/books/add', async (req, res) => {
 try {
  const book = await Book.add(Object.assign({ userId: req.user.id }, req.body));
  res.json(book);
 } catch (err) {
  logger.error(err);
  res.json({ error: err.message || err.toString() });
 }
});

/*
 * Post new meta data for metrics.
 */
api.post('/metrics/v2/:id', handler((req, res) => {
 return Promise.map(plugins, plugin => {
  const reporter = new plugin.Reporter(config[plugin.config]);
  return reporter.ping()
   .then(() => reporter.report(_.merge({}, req.body, {instance: req.params.id})))
   .then(() => log.info('Reported to %s', plugin.name))
   .then(() => reporter.close());
 });
}));