Convert a pscustomobject to a hasthtable

Convertto-Hashtable.ps1

function Convert-ToHashtable {
    param (
        [Parameter(Mandatory=$true, ValueFromPipeline=$true)]
        [PSCustomObject]$InputObject
    )
    
    process {
        $hashTable = @{}

        foreach ($property in $InputObject.PSObject.Properties) {
            $value = $property.Value

            if ($value -is [PSCustomObject]) {
                $hashTable[$property.Name] = Convert-ToHashtable -InputObject $value
            } elseif ($value -is [System.Collections.IEnumerable] -and
                      $value -notmatch 'char|byte|bool|date|string') {
                $hashTable[$property.Name] = @()

                foreach ($item in $value) {
                    if ($item -is [PSCustomObject]) {
                        $hashTable[$property.Name] += Convert-ToHashtable -InputObject $item
                    } else {
                        $hashTable[$property.Name] += $item
                    }
                }
            } else {
                $hashTable[$property.Name] = $value
            }
        }

        return $hashTable
    }
}