stackexchange-dnscontrol/pkg/js/parse_tests/013-mx.json

{
  "registrars": [],
  "dns_providers": [],
  "domains": [
    {
      "name": "foo.com",
      "registrar": "none",
      "dnsProviders": {},
      "records": [
        {
          "type": "MX",
          "name": "@",
          "target": "foo.com.",
          "mxpreference": 15
        }
      ]
    }
  ]
}