Converts a certain JSON-file (from the current directory) into a CSV-file to the Temp-folder (a Windows PowerShell script).

Convert-JsonToCsv.ps1

<#
Convert-JsonToCsv.ps1
#>


# Establish common parameters
$ErrorActionPreference = "Stop"
$path = $env:temp
$enumeration = @()
$counter = 0
$file = dir my_filename.json




# Import the JSON file
# Source: http://stackoverflow.com/questions/1825585/determine-installed-powershell-version?rq=1
# Source: https://msdn.microsoft.com/en-us/powershell/reference/5.1/microsoft.powershell.utility/convertfrom-json
# Source: https://blogs.technet.microsoft.com/heyscriptingguy/2014/04/23/powertip-convert-json-file-to-powershell-object/
# Source: http://powershelldistrict.com/powershell-json/
# Source: https://technet.microsoft.com/en-us/library/ee692803.aspx
# Source: http://stackoverflow.com/questions/32887583/powershell-v2-converts-dictionary-to-array-when-returned-from-a-function

If ((($PSVersionTable.PSVersion).Major -lt 3) -or (($PSVersionTable.PSVersion).Major -eq $null)) {

    # PowerShell v2 or earlier JSON import
    # Requires .NET 3.5 or later
    # Credit: Goyuix: "Read Json Object in Powershell 2.0" http://stackoverflow.com/questions/17601528/read-json-object-in-powershell-2-0#17602226
    $powershell_v2_or_earlier = $true

            If (($PSVersionTable.PSVersion).Major -eq $null) {
                $powershell_v1 = $true
                # LoadWithPartialName is obsolete, source: https://msdn.microsoft.com/en-us/library/system.reflection.assembly(v=vs.110).aspx
                [System.Reflection.Assembly]::LoadWithPartialName("System.Web.Extensions")
            } ElseIf (($PSVersionTable.PSVersion).Major -lt 3) {
                $powershell_v2 = $true
                Add-Type -AssemblyName "System.Web.Extensions"
            } Else {
                $continue = $true
            } # Else

    $serializer = New-Object System.Web.Script.Serialization.JavaScriptSerializer
    $source = $serializer.DeserializeObject((Get-Content -Path $file.FullName) -join "`n")

} ElseIf (($PSVersionTable.PSVersion).Major -ge 3) {

    # PowerShell v3 or later JSON import
    $source = (Get-Content -Path $file.FullName -Raw | ConvertFrom-Json)

} Else {
    $continue = $true
} # Else




# Convert the JSON data into an object
# Note: The PSCustomObject is for a reference only, it probably has to be manually modified to match the relevant tree structure of the JSON-file.
ForEach ($item in $source.features) {

    $counter++

    # Find all instances of possible matches
    # Credit: Keith Hill "How to capture multiple regex matches, from a single line, into the $matches magic variable in Powershell?" https://stackoverflow.com/questions/3141851/how-to-capture-multiple-regex-matches-from-a-single-line-into-the-matches-mag
    $coordinates = ($item.geometry.coordinates -join ';').Replace(',','.').Replace(';',',')
    $regex = Select-String "\d+.\d+" -InputObject $coordinates -AllMatches | ForEach {$_.Matches}

        $enumeration += $obj_json = New-Object -TypeName PSCustomObject -Property @{
            '#'                 = $counter
            'family'            = $item.type
            'type'              = $item.geometry.type
            'lon'               = $regex | select -ExpandProperty Value | select -First 1
            'lat'               = $regex | select -ExpandProperty Value | select -Last 1
            'id'                = $item.properties.id
            'name'              = $item.properties.name
            'name_se'           = $item.properties.name_se
            'name_en'           = $item.properties.name_en
            'description'       = $item.properties.description
            'description_se'    = $item.properties.description_se
            'description_en'    = $item.properties.description_en
            'url'               = $item.properties.url
            'url_se'            = $item.properties.url_se
            'url_en'            = $item.properties.url_en
            'order'             = $item.properties.order
            'layer'             = $item.properties.layer
            'source'            = $item.properties.source
            'start'             = $item.properties.start
            'finish'            = $item.properties.finish
            'objectid'          = $item.properties.objectid
            'img_url'           = $item.properties.img_url
            'img_lic'           = $item.properties.img_lic
            'img_auth'          = $item.properties.img_auth
            'mod_date'          = $item.properties.mod_date
            'user_mod'          = $item.properties.user_mod
            'display'           = $item.properties.display
            'coordinates'       = $coordinates
            'mid'               = $item.id
        } # New-Object

} # ForEach


# Output
$output = [string]$file.BaseName + ".csv"
$enumeration.PSObject.TypeNames.Insert(0,"JSON columns")
$enumeration_selection = $enumeration | Select-Object '#','family','type','lon','lat','id','name','name_se','name_en','description','description_se','description_en','url','url_se','url_en','order','layer','source','start','finish','objectid','img_url','img_lic','img_auth','mod_date','user_mod','display','coordinates','mid'
$enumeration_selection | Export-Csv "$path\$output" -Delimiter ";" -Encoding UTF8 -NoTypeInformation

ForEach ($item in $source.results) {

    $counter++

    $coordinates = ($item.location.coordinates -join ";").Replace(',','.').Replace(';',',')
    $regex = Select-String "\d+.\d+" -InputObject $coordinates -AllMatches | ForEach {$_.Matches}

        $enumeration += $obj_json = New-Object -TypeName PSCustomObject -Property @{
            '#'                 = $counter
            'id'                = $item.id
            'service_id'        = $item.services -join ","
            'identifiers'       = ($item.identifiers | select -First 1).value
            'lon'               = $regex | select -ExpandProperty Value | select -First 1
            'lat'               = $regex | select -ExpandProperty Value | select -Last 1
            'name_fi'           = $item.name.fi
            'name_se'           = $item.name.sv
            'street_address_fi' = $item.street_address.fi
            'street_address_se' = $item.street_address.sv
            'address_zip'       = $item.address_zip            
            'info_1_fi'         = ($item.connections | select -First 1).name.fi
            'info_1_sv'         = ($item.connections | select -First 1).name.sv
            'info_2_fi'         = ($item.connections | select -Skip 1 -First 1).name.fi
            'info_2_sv'         = ($item.connections | select -Skip 1 -First 1).name.sv
            'info_3_fi'         = ($item.connections | select -Skip 2 -First 1).name.fi
            'info_3_sv'         = ($item.connections | select -Skip 2 -First 1).name.sv
            'info_4_fi'         = ($item.connections | select -Skip 3 -First 1).name.fi
            'info_4_sv'         = ($item.connections | select -Skip 3 -First 1).name.sv
            'info_5_fi'         = ($item.connections | select -Skip 4 -First 1).name.fi
            'info_5_sv'         = ($item.connections | select -Skip 4 -First 1).name.sv
            'keywords_fi'       = $item.keywords.fi -join ', '
            'keywords_se'       = $item.keywords.sv -join ', '            
            'note_fi'           = $item.short_description.fi
            'note_sv'           = $item.short_description.sv
            'contract_type_fi'  = ($item.contract_type | select -First 1).description.fi
            'contract_type_sv'  = ($item.contract_type | select -First 1).description.sv
            'picture_url'       = $item.picture_url       
            'www_fi'            = $item.www.fi
            'www_se'            = $item.www.sv     
            'created_time'      = $item.created_time
            'modified_time'     = $item.last_modified_time
            'data_source'       = $item.data_source
            'maintenance'       = ($item.extensions | select -First 1).maintenance_organization
            'department'        = $item.department
            'root_department'   = $item.root_department
            'root_service'      = $item.root_service_nodes -join ","
            'main_service'      = $item.service_nodes -join ","
            'municipality'      = $item.municipality
            'coordinates'       = $coordinates

        } # New-Object

} # ForEach


# Output
$output = [string]$file.BaseName + ".csv"
$enumeration.PSObject.TypeNames.Insert(0,"JSON columns")
$enumeration_selection = $enumeration | Select-Object '#','id','service_id','identifiers','lon','lat','name_fi','name_se','street_address_fi','street_address_se','address_zip','info_1_fi','info_1_sv','info_2_fi','info_2_sv','info_3_fi','info_3_sv','info_4_fi','info_4_sv','info_5_fi','info_5_sv','keywords_fi','keywords_se','note_fi','note_sv','contract_type_fi','contract_type_sv','picture_url','www_fi','www_se','created_time','modified_time','data_source','maintenance','department','root_department','root_service','main_service','municipality','coordinates'
$enumeration_selection | Export-Csv "$path\$output" -Delimiter ";" -Encoding UTF8 -NoTypeInformation