ConvertAzureAppGatewayAccessLogJSONToCSV.ps1

<#
.SYNOPSIS
  Converts Azure Application Gateway access logs in JSON format to CSV
.DESCRIPTION
  This PowerShell script was tested with PowerShell v5.1
.NOTES
   AUTHOR: Jayan Kandathil (Adobe AEM Managed Services)
   LASTEDIT: October 20, 2017
#>

$Watch = [System.Diagnostics.Stopwatch]::StartNew()

$path = "G:\TEMP\"
$filename = "PT1H"

$json = Get-Content -Path $path$filename.json | ConvertFrom-Json

$columns = "`"timestamp`",`"instanceId`",`"clientIP`",`"clientPort`",`"httpMethod`",`"requestUri`",`"requestQuery`",`"userAgent`",`"httpStatus`",`"httpVersion`",`"receivedBytes`",`"sentBytes`",`"timeTaken`",`"sslEnabled`""
Write-Host $columns
Add-Content $path$filename.csv $columns

foreach ($record in $json.records)
{
  foreach ($property in $record.properties)
  {
    $output = "`"" + $record.time + "`",`"" + $property.instanceId + "`",`"" + $property.clientIP + "`",`"" + $property.clientPort + "`",`"" + $property.httpMethod + "`",`"" + $property.requestUri + "`",`"" + $property.requestQuery + "`",`"" + $property.userAgent + "`",`"" + $property.httpStatus + "`",`"" + $property.httpVersion + "`",`"" + $property.receivedBytes + "`",`"" + $property.sentBytes + "`",`"" + $property.timeTaken + "`",`"" + $property.sslEnabled + "`""
    Write-Host $output
    Add-Content $path$filename.csv $output
  }
}

$Watch.Stop()

Write-Host -foregroundcolor Yellow "Processed" $json.records.Count "records"
Write-Host -foregroundcolor Yellow "Took $($Watch.Elapsed.TotalSeconds) seconds"