Powershell: JSON to Excel - json

Question

I have had a problem for days and am now reporting here. I want to export several JSON files to an Excel spreadsheet. The JSON keys should form the headers and the values should be listed under the headers. Unfortunately, I have zero understanding of Powershell and can't get any further with the help of other threads, as I also don't understand why something works or doesn't work the way it does.
The json files look something like this
{"dataCollection": [
{
"objectID": 000001,
"randomID": 123,
"desc": "The sky is blue",
"startTime": "2022-03-15T11:31:56.510",
"endTime": "2022-03-15T11:31:56.511",
"caseOne": true,
"caseTwo": false,
"caseThree": null
},
{
"objectID": 333222,
"randomID": 456,
"desc": "example",
"startTime": "2022-03-15T11:31:56.510",
"endTime": "2022-03-15T11:31:56.511",
"caseOne": false,
"caseTwo": true,
"caseThree": null
},
{
"objectID": 111111,
"randomID": 789,
"desc": "Mo-Fr 60% 20-24",
"startTime": "2022-03-15T11:31:56.510",
"endTime": "2022-03-15T11:31:56.511",
"caseOne": false,
"caseTwo": false,
"caseThree": null
}
]}
My current code looks like this
$contentJson = Get-Content -Raw -Path $jsonInput | ConvertFrom-Json
$obj_list = $contentJson | Select-Object #{Name='Name';Expression={$_}}
$obj_list | Export-Csv $csvOutput -NoType -Delimiter "`t" -Encoding Unicode
(Get-Content -Path $csvOutput -Raw).replace('"','') | Set-Content -Path $csvOutput
This does give me a CSV with the information from the json, however it is transferred cell by cell and I have no idea how to create headers. Further this works at all only, as soon as I remove in the first line of the JSON (in this case {"DataCollection":), otherwise in the Excel table only the following is written: #{ttDebugTage=System.Object[]}
My goal is something looking like this:
Excel:
This is the first time I'm working with Powershell and unfortunately I'm completely lacking in understanding, so I would appreciate any help.

Answer 1

$contentJson = #'
{"dataCollection": [
{
"objectID": 000001,
"randomID": 123,
"desc": "The sky is blue",
"startTime": "2022-03-15T11:31:56.510",
"endTime": "2022-03-15T11:31:56.511",
"caseOne": true,
"caseTwo": false,
"caseThree": null
},
{
"objectID": 333222,
"randomID": 456,
"desc": "example",
"startTime": "2022-03-15T11:31:56.510",
"endTime": "2022-03-15T11:31:56.511",
"caseOne": false,
"caseTwo": true,
"caseThree": null
},
{
"objectID": 111111,
"randomID": 789,
"desc": "Mo-Fr 60% 20-24",
"startTime": "2022-03-15T11:31:56.510",
"endTime": "2022-03-15T11:31:56.511",
"caseOne": false,
"caseTwo": false,
"caseThree": null
}
]}
'#
($contentJson | ConvertFrom-Json).dataCollection |
Select-Object -Property objectID, randomID, desc |ConvertTo-Csv -Delimiter "`t"
"objectID" "randomID" "desc"
"1" "123" "The sky is blue"
"333222" "456" "example"
"111111" "789" "Mo-Fr 60% 20-24"

Answer 2

################## PFADE ###################
$jsonDirectory = 'DIR\TO\JSON\FILES'
$csvFile = 'DIR\TO\OUTPUT\FILE.CSV'
################ Variablen #################
$excel = New-Object -ComObject Excel.Application
############################################
#ALLE JSON FILES
$jsonFiles = Get-ChildItem -Path $jsonDirectory -Filter *.json
#FILTER
$unwantedKeys = #("Example1", "Example2", "Example3")
#ARRAY ZWISCHENSPEICHER
$jsonData = #()
foreach ($jsonFile in $jsonFiles) {
#Lädt JSON File
$json = Get-Content $jsonFile.FullName | ConvertFrom-Json
$firstKey = ($json.PSObject.Properties.Name)
#Filter
$json = $json.$firstKey | Select-Object * -ExcludeProperty $unwantedKeys
#Content ins Array
$jsonData += $json
}
#Erstellt CSV und Importiert JSON Content
$jsonData | Export-Csv $csvFile -NoTypeInformation -Delimiter "`t" -Encoding Unicode
#Anpassen von Spaltenbreite auf Valuelänge
$Workbook = $excel.Workbooks.Open($csvFile)
$Worksheet = $Workbook.Sheets.Item(1)
$range = $worksheet.UsedRange
$range.EntireColumn.AutoFit()
$excel.Visible = $True