Convert CSV file to JArray - json

Question

I have a need to export the json results of a Invoke-WebRequest call to a .CSV file so that non-technical users can edit the data. This is what the json looks like when I save it to a .CSV file:
{
"Forecasts": [
{
"AccountNumber": "12345",
"Period": "2022-02-01T00:00:00",
"Field1": 3998.87968239,
"Field2": 2133.91206875
},
{
"AccountNumber": "12346",
"Period": "2022-03-01T00:00:00",
"Field1": 6741.483,
"Field2": 4007.857
}
]
}
I'm creating the .CSV file with this line of code:
$json.Forecasts | ForEach-Object { $_ | Export-Csv -path $fileName -NoTypeInformation -Append -Force }
And this is working good. After the user edits the data and saves and closes the .CSV file, I need to convert the .CSV data back into a JArray that looks like the original json structure (like above) so I can make another Invoke-WebRequest call (Patch), passing the JArray as the Body.
When I execute this line of code:
$editedJson = Get-Content -Raw -Path "$fileName" | ConvertFrom-CSV | Select-Object -Property AccountNumber,Period,Field1,Field2 | ConvertTo-json
The json looks like this:
[
{
"AccountNumber": "12345",
"Period": "2022-02-01T00:00:00",
"Field1": "3900.87968239",
"Field2": "2100.91206875"
},
{
"AccountNumber": "12346",
"Period": "2022-03-01T00:00:00",
"Field1": "6700.483",
"Field2": "4000.857"
}
]
As you can see, it's missing the "Forecasts" portion of the JArray and I don't know how to get the .CSV data back into this format. Can anyone help with this ?

Answer 1

You simply need to create an object with that property (Forecasts) and attach the imported CSV to said property:
# This line would be where you import the CSV:
# $csv = Import-Csv .....
$csv = #'
"AccountNumber","Period","Field1","Field2"
"12345","2/1/2022 12:00:00 AM","3998.87968239","2133.91206875"
"12346","3/1/2022 12:00:00 AM","6741.483","4007.857"
'# | ConvertFrom-Csv
#{
Forecasts = $csv
} | ConvertTo-Json
If you want to assure that the JSON representation of Forecasts is always an array (even when the CSV only has one row):
#{
Forecasts = [array]$csv
} | ConvertTo-Json