confme/examples/simple-app/config.json

Opinionated config library that allows you to have complex config and behaves according to Twelve Factor App rules

{
  "listenPort": "{{ PORT }}",
  "apiPath": "https://{{DOMAIN}}:{{PORT}}/api/v1",
  "staticUrl": "https://{{DOMAIN}}:{{PORT}}/static",
  "mainPage": "https://{{DOMAIN}}:{{PORT}}",
  "mail": {
    "from": "MyApp",
    "transport": "SMTP",
    "auth": {
      "user": "{{SMTP_USER}}",
      "pass": "{{SMTP_PASS}}"
    }
  }
}