将带有数组的嵌套 JSON 展平并过滤为 CSV

Question

我有一个关于如何使用 Powershell 展平嵌套的 JSON 并转换为 CSV。下面是我的 JSON，这是从 Office 365 获取的包含许多用户消息的邮件消息日志，我需要过滤列，展平并转换为 CSV：

createdDateTime,
receivedDateTime,
from_name
from_adress
To_name_1
To_adress_2
To_name_2
To_adress_2
...

"from"字段只有一个数据。但是 "toRecipients" 是一个数组。

{
  ...
  "createdDateTime": "xxxx-xx-xx",
  "receivedDateTime": "xxxx-xx-xx",
  "isRead": true,
  "from": {
    "emailAddress": {
      "name": "John",
      "adress": "john@onmicrosoftware.com"
    }
  },
  "toRecipients": [
    {
      "emailAddress": {
        "name": "Amy",
        "adress": "Amy@onmicrosoftware.com"
      }
    },
    {
      "emailAddress": {
        "name": "Amy",
        "adress": "Amy@onmicrosoftware.com"
      }
    }
  ]
}

Answer 1

这是一个完整的可运行示例。它将创建一个文件 "C:\test.csv".

没有 "automatic" 将嵌套对象展平为平面对象的方法。但是您可以手动为平面对象创建分配属性。

首先我将 JSON 文本解析为 powershell 对象

$obj = @"
{
  "createdDateTime": "xxxx-xx-xx",
  "receivedDateTime": "xxxx-xx-xx",
  "isRead": true,
  "from": {
    "emailAddress": {
      "name": "John",
      "adress": "john@onmicrosoftware.com"
    }
  },
  "toRecipients": [
    {
      "emailAddress": {
        "name": "Amy",
        "adress": "Amy@onmicrosoftware.com"
      }
    },
    {
      "emailAddress": {
        "name": "Amy",
        "adress": "Amy@onmicrosoftware.com"
      }
    }
  ]
}
"@ | ConvertFrom-Json

现在获取 Powershell 对象（或对象列表，即使您有很多这样的条目也可以使用）并将其通过管道传递给 ForEach-Object。在循环内将不同的属性映射到平面对象。

$flattened = $obj | ForEach-Object {
    return [PSCustomObject]@{
        createdDateTime = $_.createdDateTime
        receivedDateTime = $_.receivedDateTime
        from_name = $_.from.emailAddress.name
        from_adress = $_.from.emailAddress.adress
        to_name_1 = $_.toRecipients[0].emailAddress.name
        to_adress_1 = $_.toRecipients[0].emailAddress.adress
        to_name_2 = $_.toRecipients[1].emailAddress.name
        to_adress_2 = $_.toRecipients[1].emailAddress.adress
    }
}

现在您可以将整个内容导出为 CSV

$flattened | Export-Csv C:\test.csv -Delimiter ";" -Encoding UTF8

这假设总是有 2 个收件人。如果遇到更多，可以动态添加 to_name_3、to_name_4 等，但要复杂一些。

将带有数组的嵌套 JSON 展平并过滤为 CSV

Flatten a nested JSON with array and filter to CSV

powershell

json

office365