SuperTokens is an open source authentication solution offering features like: Different types of login: Email / password, Passwordless (OTP or Magic link based).

SuperTokens.com

config is 

```

# (OPTIONAL | Default: "localhost") string value. The host on which SuperTokens service runs. Values here can
# be localhost, example.com, 0.0.0.0 or any IP address associated with your machine
# host:
```
and port empty
```
# (OPTIONAL | Default: 3567) integer value. The port at which SuperTokens service runs.
# port:

```

empty

I think the mistake is here