Handling hash tables in custom objects - powershell

Question

Our monitoring system has a REST API that I am trying to retrieve properties from, then output them to a custom object. A couple of the property values are hash tables.
In addition to keeping the custom objects for use in Powershell, I would like to export them to CSV, so I need those hash tables to be something else, so I don't end up with Syste.Object[] in those columns.
The object returned from the API looks like this (truncated):
$allServices[0]
alertStatus : none
ignoreSSL : True
description : Test service
stopMonitoring : False
stopMonitoringByFolder : False
useDefaultLocationSetting : False
serviceProperties : {}
transition : 1
alertStatusPriority : 100000
serviceFolderId : 1
script :
disableAlerting : False
individualAlertLevel : warn
checkpoints : {#{id=1; geoInfo=Overall; smgId=0}, #{id=2; geoInfo=US - Los Angeles; smgId=1}, #{id=3; geoInfo=US - Washington DC; smgId=2}, #{id=4; geoInfo=US - San Francisco; smgId=3}...}
pageLoadAlertTimeInMS : 30000
sdtStatus : none-none-none
serviceStatus : alive
method : tabledriven
id : 1
Then checkpoints looks like this:
$allServices[0].checkpoints
id geoInfo smgId
-- ------- -----
1 Overall 0
2 US - Los Angeles 1
3 US - Washington DC 2
4 US - San Francisco 3
5 Europe - Dublin 4
6 Asia - Singapore 5
What is the best way to deal with the checkpoints property?
Thanks.

Answer 1

Convert checkpoints (and possibly serviceProperties) to a JSON string.
$allServicesCSV = foreach ($srv in $allServices) {
$srv = $srv.PSObject.Copy() # shallow copy
$srv.checkpoints = ConvertTo-Json $srv.checkpoints -Compress
$srv
}

Answer 2

Well, the requirements changed, so I only need to output to json/XML and not to CSV, making this much easier. Thanks.