JSON Schema for validating SMTP configurations. This schema ensures that each configuration in an array contains the required properties (host, port, user, and pass) with the correct data types and disallows additional properties.

smtp-config-schema.json

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": {
    "type": "object",
    "properties": {
      "host": {
        "type": "string"
      },
      "port": {
        "type": "number"
      },
      "user": {
        "type": "string"
      },
      "pass": {
        "type": "string"
      }
    },
    "required": ["host", "port", "user", "pass"],
    "additionalProperties": false
  }
}