schema.json

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Config",
  "examples": [
    {
      "database": {
        "database": "test_database",
        "database_type": "mssql",
        "password": "passw0rd!",
        "server": "localhost",
        "user": "testuser"
      },
      "tables": [
        {
          "columns": [],
          "name": "some_table",
          "where_clause": "where 1=1"
        }
      ]
    }
  ],
  "type": "object",
  "properties": {
    "database": {
      "type": "object",
      "properties": {
        "database": {
          "type": "string"
        },
        "database_type": true,
        "password": {
          "type": "string"
        },
        "server": {
          "type": "string"
        },
        "user": {
          "type": "string"
        }
      }
    },
    "tables": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "columns": {
            "type": "array",
            "items": true
          },
          "name": {
            "type": "string"
          },
          "where_clause": {
            "type": [
              "string",
              "null"
            ]
          }
        }
      }
    }
  }
}