PowerShell 2.0 ConvertFrom-Json and ConvertTo-Json implementation

I would like to monkeypatch a PowerShell 2.0 environment where the upgrade to 3.0 is not possible at this time.

I am looking for a PowerShell 2.0 script implementation of the `ConvertFrom-Json` cmdlet and `ConvertTo-Json` cmdlet that are in PowerShell 3.0.

I am most interested in the `ConvertFrom-Json`, but `ConvertTo-Json` would also be nice.

Code with javascriptSerializer return objects with Dictionary inside. Modern convertfrom-JSON (4.0+) return objects only. This code transform deserialize object to modern output :)

function Iterate-Tree($jsonTree) {
$result = @()
foreach ($node in $jsonTree) {
$nodeObj = New-Object psobject
foreach ($property in $node.Keys) {
if ($node[$property] -is [System.Collections.Generic.Dictionary[String, Object]] -or $node[$property] -is [Object[]]) {
$inner = @()
$inner += Iterate-Tree $node[$property]
$nodeObj | Add-Member -MemberType NoteProperty -Name $property -Value $inner
} else {
$nodeObj | Add-Member -MemberType NoteProperty -Name $property -Value $node[$property]
#$nodeHash.Add($property, $node[$property])
}
}
$result += $nodeObj
}
return $result
}

function ConvertFrom-Json20{
[cmdletbinding()]
Param (
[parameter(ValueFromPipeline=$true)][object] $PS_Object
)

add-type -assembly system.web.extensions
$PS_JavascriptSerializer=new-object system.web.script.serialization.javascriptSerializer
$PS_DeserializeObject = ,$PS_JavascriptSerializer.DeserializeObject($PS_Object)

#Convert Dictionary to Objects
$PS_DeserializeObject = Iterate-Tree $PS_DeserializeObject

return $PS_DeserializeObject
}

function ConvertTo-Json20([object] $item){
add-type -assembly system.web.extensions
$ps_js=new-object system.web.script.serialization.javascriptSerializer
return $ps_js.Serialize($item)
}

function ConvertFrom-Json20([object] $item){
add-type -assembly system.web.extensions
$ps_js=new-object system.web.script.serialization.javascriptSerializer

#The comma operator is the array construction operator in PowerShell
return ,$ps_js.DeserializeObject($item)
}

If you're getting the error:

Add-Type : Could not load file or assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 or one of its dependencies. The system cannot find the file specified. "

... these registry commands can be run ([more details][1]):

reg add hklm\software\microsoft\.netframework /v OnlyUseLatestCLR /t REG_DWORD /d 1 /f
reg add hklm\software\wow6432node\microsoft\.netframework /v OnlyUseLatestCLR /t REG_DWORD /d 1 /f

[1]:

[To see links please register here]

A little bit improved option:



function Iterate-Tree($jsonTree) {
$result = @()
foreach ($node in $jsonTree) {
$nodeObj= New-Object psobject
foreach ($property in $node.Keys) {
if(-not ($property)){
continue }

if ($node[$property] -is [System.Collections.Generic.Dictionary[String, Object]] -or $node[$property] -is [Object[]]) {
$nodeObj | Add-Member -MemberType NoteProperty -Name $property -Value (Iterate-Tree $node[$property])
} else {
$nodeObj | Add-Member -MemberType NoteProperty -Name $property -Value $node[$property]
#$nodeHash.Add($property, $node[$property])
}
}
$result += $nodeObj
}
return [Object]$result
}