Iterating through key names from a PSCustomObject

Question

I am writing a script for my site that utilizes a JSON configuration file. The JSON is similar to the following:

\"Groups\": {
    \"GroupOne\": {
        \"Nami         


        

Answer 1

I think I might have just figured it out thanks to the blog post Converting PsCustomObject To/From Hashtables.

Using Get-Member and then -MemberType exposes each Group and then you just pull the:

foreach ($group in $configObject.Groups) {
    $groupName = $($group | Get-Member -MemberType *Property).Name
}

Outputs:

GroupOne
GroupTwo
GroupThree

I'm open to any other methods though.

Update

I've found another way, but the only drawback is it doesn't use the fancy ConvertFrom-Json CmdLet. Instead it goes straight to the .NET library and uses its deserializer and converts it to a HashTable. This completely avoids having to muddle around with the PSCustomObject. IMO hashtables are a whole lot easier to work with.

$JSON = Get-Content -Path path/to.json -Raw
$HT = (New-Object System.Web.Script.Serialization.JavaScriptSerializer).Deserialize($JSON, [System.Collections.Hashtable])
$HT.Groups.GetEnumerator() | ForEach-Object {
    Write-Host "$($_.Key) : $($_.Value)"
}

Answer 2

Solution

I'm not sure how early of a version you can do this with, but it works for me in PowerShell 5.1... Feel free to give it a try in earlier versions:

$ipinfo = Invoke-WebRequest 'http://ipinfo.io/json' -UseBasicParsing | ConvertFrom-Json
foreach ($info in $ipinfo.PSObject.Properties) {
    $info.Name
    $info.Value
    '--' # <-- Seeing this double hash proves we're iterating fully.
}

Outputs

ip
1.2.3.4
--
hostname
No Hostname
--
city
Denton
--
region
Texas
--
country
US
--
loc
33.2148,-97.1331
--
org
AS589 University of North Texas
--
postal
76203
--

This is all done with PowerShell 4.0; ConvertTo-Json and ConvertFrom-Json were introduced in PowerShell 3.0; I haven't tested PowerShell 3.0 or 5.0.

---

Another Example

Try it for yourself with another example:

$ipinfo = ConvertFrom-Json (Invoke-WebRequest 'http://ipinfo.io/json' -UseBasicParsing)
foreach ($info in ($ipinfo.PSObject.Members | ?{ $_.MemberType -eq 'NoteProperty'})) {
    $info.Name
    $info.Value
    '--'
}

Outputs

ip
1.2.3.4
--
hostname
No Hostname
--
city
Denton
--
region
Texas
--
country
US
--
loc
33.2148,-97.1331
--
org
AS589 University of North Texas
--
postal
76203
--

---

This and other PowerShell looping are available on my blog.