Unable to copy json block - json

Question

I'm trying to copy condition block from id 106 to id 107 with script below; however, I got error "ConvertFrom-Json : Invalid JSON primitive:". Am I missing something? Please advise.
$a = Get-Content 'C:\DevOps\mytest.json' -raw | ConvertFrom-Json
$condition = $a | select -expand environments | select -expand conditions
Write-Host $condition[0]
$a | add-member -Name $condition[1].name -value (Convertfrom-Json $condition[0]) -MemberType NoteProperty
Write-Host $update
$a | ConvertTo-Json -Depth 20 | set content 'C:\DevOps\updatedmytest.json'
The JSON file contains:
{
"source": "userInterface",
"id": 25,
"revision": 3,
"environments": [
{
"id": 106,
"conditions": [
{
"name": "ReleaseStarted",
"conditionType": "event",
"value": ""
}
]
},
{
"id": 107,
"conditions": [
]
}
]
}
Best Regards,
Andy Pham

Answer 1

The error message you are receiving is because you convert the JSON into a PowerShell Object and then saved it into the variable $a. $condition then is still a PowerShell object that you have expanded and is not JSON. So -value (Convertfrom-Json $condition[0]) doesn't work because it's already converted.
Convert to an object, make changes directly to the object, convert from the object.
$ConvertedJSON = Get-Content 'C:\DevOps\mytest.json' -Raw | ConvertFrom-Json
$ConvertedJSON.environments[1].conditions = $ConvertedJSON.environments[0].conditions
$ConvertedJSON | ConvertTo-Json -Depth 20 | Set-Content 'C:\DevOps\updatedmytest.json'
Alternatively, you could use Where-Object to filter for the ids.
$ConvertedJSON = Get-Content 'C:\DevOps\mytest.json' -Raw | ConvertFrom-Json
($ConvertedJSON.environments | Where-Object {$_.id -eq 107}).conditions = ($ConvertedJSON.environments | Where-Object {$_.id -eq 106}).conditions
$ConvertedJSON | ConvertTo-Json -Depth 20 | Set-Content 'C:\DevOps\updatedmytest.json'