在 Node-Red 中解析 JSON javascript

Question

我之前在 C# 中解析过 JSON 但这次我打算在 Node-Red 中使用 JavaScript。我在网上搜索并找到了几个用 JavaScript 解析 JSON 的解决方案，但在所有示例中，JSON 非常简单，其中的数据不多 "level"。

我将提供我需要解析的 JSON 文件的一小部分

{
"programStatus": {
"modified_host_attributes": "1",
"modified_service_attributes": "1",
"serial_host_check_stats": "0,0,0"
},
"hosts": {
"FILANAS01": {
  "host_name": "FILANAS01",
  "modified_attributes": "0",
  "check_command": "check-host-alive",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
},
"FILANAS02": {
  "host_name": "FILANAS02",
  "modified_attributes": "0",
  "check_command": "check-host-alive",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
},
"FILANSW01": {
  "host_name": "FILANSW01",
  "modified_attributes": "0",
  "check_command": "check-host-alive",
  "scheduled_downtime_depth": "0"
},
"FILANSW02": {
  "host_name": "FILANSW02",
  "modified_attributes": "0",
  "check_command": "check-host-alive",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
}
},
"services": {
"FILANSW01": {
"HP ProCurve Hardware Check": {
  "host_name": "FILANSW01",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
},
"System Location": {
  "host_name": "FILANSW01",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
}
},
"FILANSW02": {
"HP ProCurve Hardware Check": {
  "host_name": "FILANSW02",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
},
"System Location": {
  "host_name": "FILANSW02",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
}
},
"FILASDC02": {
"Active Directory Domain Services": {
  "host_name": "FILASDC02",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
},
"CPU Load": {
  "host_name": "FILASDC02",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
},
"DNS Server": {
  "host_name": "FILASDC02",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
},
"Drive Space C:": {
  "host_name": "FILASDC02",
  "current_state": "0",
  "scheduled_downtime_depth": "0"
   }
  }
 }
}

这是从 Nagios 生成的，它包含服务器和交换机以及有关它们的信息。我需要遍历所有 "hosts" 并查看 "current_state" 是什么，如果它是其他东西然后 0 那么我将从 "host" 中获取 "host_name" 和一些其他信息。

和 "services" 中的相同内容检查当前状态，如果它不是 0。

然后我将使用我从中获取的信息创建一个数组 JSON 并将其显示在信息屏幕上。

但我需要一些帮助才能开始使用 JSON。谢谢

Answer 1

 Assign the entire JSON in a JavaScript variable, complete code shown below:

` 变量 myJSON = { "programStatus"：{ "modified_host_attributes": "1", "modified_service_attributes": "1", "serial_host_check_stats": "0,0,0" }, "hosts"：{ "FILANAS01"：{ "host_name": "FILANAS01", "modified_attributes": "0", "check_command": "check-host-alive", "current_state": "0", "scheduled_downtime_depth"：“0” }, "FILANAS02"：{ "host_name": "FILANAS02", "modified_attributes": "0", "check_command": "check-host-alive", "current_state": "0", "scheduled_downtime_depth"：“0” }, "FILANSW01"：{ "host_name": "FILANSW01", "modified_attributes": "0", "check_command": "check-host-alive", "scheduled_downtime_depth"：“0” }, "FILANSW02"：{ "host_name": "FILANSW02", "modified_attributes": "0", "check_command": "check-host-alive", "current_state": "0", "scheduled_downtime_depth"：“0” } }, "services"：{ "FILANSW01"：{ "HP ProCurve Hardware Check"：{ "host_name": "FILANSW01", "current_state": "0", "scheduled_downtime_depth"：“0” }, "System Location"：{ "host_name": "FILANSW01", "current_state": "0", "scheduled_downtime_depth"：“0” } }, "FILANSW02"：{ "HP ProCurve Hardware Check"：{ "host_name": "FILANSW02", "current_state": "0", "scheduled_downtime_depth"：“0” }, "System Location"：{ "host_name": "FILANSW02", "current_state": "0", "scheduled_downtime_depth"：“0” } }, "FILASDC02"：{ "Active Directory Domain Services"：{ "host_name": "FILASDC02", "current_state": "0", "scheduled_downtime_depth"：“0” }, "CPU Load"：{ "host_name": "FILASDC02", "current_state": "0", "scheduled_downtime_depth"：“0” }, "DNS Server"：{ "host_name": "FILASDC02", "current_state": "0", "scheduled_downtime_depth"：“0” }, "Drive Space C:"：{ "host_name": "FILASDC02", "current_state": "0", "scheduled_downtime_depth"：“0” } } } }

Now iterate through:

var host = Object.keys(myJSON["hosts"]);
for (var i = 0; i < host.length; i++) {
      var hostData = host[i];
      var hostProp = myJSON.hosts[hostData];
      if (hostProp.current_state != 0) {
           //Do your work.
      } 
}
I've tested Object.keys() in a few browsers like IE9, IE10, Chrome 46
and FireFox, it works but fails in IE8.

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