sviluppo@MacBook-Pro-di-Sviluppo backend-api % npm run start

> [email protected] start /Users/sviluppo/Documents/Corsi/React/backend-api
> node db

Error: querySrv ETIMEOUT _mongodb._tcp.cluster0.mttep.mongodb.net
    at QueryReqWrap.onresolve [as oncomplete] (dns.js:202:19) {
  errno: 'ETIMEOUT',
  code: 'ETIMEOUT',
  syscall: 'querySrv',
  hostname: '_mongodb._tcp.cluster0.mttep.mongodb.net'
}
/Users/sviluppo/Documents/Corsi/React/backend-api/node_modules/mongodb/lib/utils.js:725
          throw error;
          ^

TypeError: Cannot read property 'db' of undefined
    at Object.<anonymous> (/Users/sviluppo/Documents/Corsi/React/backend-api/models/User.js:2:41)
    at Module._compile (internal/modules/cjs/loader.js:955:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:991:10)
    at Module.load (internal/modules/cjs/loader.js:811:32)
    at Function.Module._load (internal/modules/cjs/loader.js:723:14)
    at Module.require (internal/modules/cjs/loader.js:848:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at Object.<anonymous> (/Users/sviluppo/Documents/Corsi/React/backend-api/controllers/userController.js:1:14)
    at Module._compile (internal/modules/cjs/loader.js:955:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:991:10)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] start: `node db`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/sviluppo/.npm/_logs/2020-07-30T14_29_49_892Z-debug.log