const errs = [
  "Table 'nutrition.users' doesn't exist",
  "connect ECONNREFUSED 172.18.0.2:3306",
  "connect ECONNREFUSED db:3306",
  "Unknown database 'nutrition'"
];
errs.forEach(e => {
  const json = JSON.stringify({ error: e });
  console.log(Buffer.byteLength(json), json);
});