Export nested hash table to csv in powershell - powershell

Question

I have an array, with a nested hashtable containing data:
tid : 1
token : 12345
participant_info : #{firstname=bob; lastname=smith; email=bob.smith#email.com}
completed : y
tid : 2
token : 67890
participant_info : #{firstname=Alice; lastname=Jones; email=alice.jones#email.com}
completed : n
I would like to output this as a CSV with the nested items of firstname, surname and email pulled out of the inner hashtable - eg
tid,token,firstname,surname,email,completed
1,12345,bob,smith,bob.smith#email.com,y
2,67890,alice,jones,alice.jones#email.com,n
I'm going to guess that the answer is looping through with foreach and creating a custom ps object, but because my nested items aren't named, I can't work out how to do this using the other examples on here.
Any assistance is appreciated! Thanks!

Answer 1

Given your sample:
#(
[pscustomobject]#{
tid = 1
token = 12345
participant_info = #{
firstname = 'bob'
lastname = 'smith'
email = 'bob.smith#email.com'
}
completed = 'N'
}
...
)
And desired output:
id,token,firstname,surname,email,completed
1,12345,bob,smith,bob.smith#email.com,y
2,67890,alice,jones,alice.jones#email.com,n
You can do something like this:
$JsonList = #( ... )
$Path = "$Env:UserProfile\file.csv"
ForEach ($Sample in $JsonList)
{
$Sample | Select-Object -Property #(
#{N = 'id'; E = { $Sample.tid }}
#{N = 'token'; E = { $Sample.token }}
#{N = 'firstname'; E = { $Sample.participant_info.firstname }}
#{N = 'surname'; E = { $Sample.participant_info.lastname }}
#{N = 'email'; E = { $Sample.participant_info.email }}
#{N = 'completed'; E = { $Sample.completed }}
) | Export-Csv -Path $Path -Append
}
Edit: you're dealing with PSCustomObject, not Hashtable, so my previous syntax won't work for that. Here's what I'm presuming your code to look like now (I've updated my above example):
#"
[
{
"tid": 1,
"token": 12345,
"participant_info": {
"firstname": "bob",
"lastname": "smith",
"email": "bob.smith#email.com"
},
"completed": "N"
}
...
]
"# | ConvertFrom-Json