$($node:$21416)[$MONGODB DRIVER$]$ Warning: useNewUrlParser is a deprecated option: useNewUrlParser has no effect since Node.js Driver version $4\mathrm{.}0\mathrm{.}0$ and will be removed in the next major version

$($Use $`$node $--$trace$-$warnings $...`$ to show where the warning was created$)$

$($node:$21416)[$MONGODB DRIVER$]$ Warning: useUnifiedTopology is a deprecated option: useUnifiedTopology has no effect since Node.js Driver version $4\mathrm{.}0\mathrm{.}0$ and will be removed in the next major version

Listening on port $4000...$

MongoDB connection error: Error: querySrv ENOTFOUND $\_$mongodb.$\_$tcp$.$cluster$0.$mongodb.net

$$ at QueryReqWrap.onresolve $[$as oncomplete$]($node:internal$/$dns$/$promises:$291$:$17)\{$

$$ errno: undefined,

$$ code: 'ENOTFOUND',

$$ syscall: 'querySrv',

$$ hostname: $\text{'}\_$mongodb.$\_$tcp$.$cluster$0.$mongodb.net'

$\}$