powershell json object with square brackets - json

Question

I have an import of 1+ emails that have to be added to a json object. A foreach loop checks to see if the emails are valid (code not addded to this example). When the import contains 2+ cases, the format of the json object is correct:
[
{
"Name": "John Doe",
"Email": "email#gmail.com"
},
{
"Name": "Jane Doe",
"Email": "email#live.com"
}
]
Namely, square brackets with each object in curly brackets, separated by comma.
But when the foreach loop only returns 1 valid email, the format becomes:
{
"Name": "John Doe",
"Email": "email#gmail.com"
}
This is the code I am running:
$body = foreach($row in $mailinglistimp)
{
#{
Email=$row.EPOSTADR
Name=$row.KUNDE_NM
}
}
$body_json = ConvertTo-json $body
How can I force the object to look like this with only one item in the foreach loop?
[
{
"Name": "John Doe",
"Email": "email#gmail.com"
},
]
On a related note, a similar problem was solved by using [int[]] $ids inside another json object, but I cant get a similar code to work using [string[]].

Answer 1

This is somewhat unlikely if you ask me, because you want to declare an array which contains a single item. PowerShell will always see this like a single item and won't add square brackets (array declaration for JSON). But I ran into the same issue when I was making a script to update changes in TOPdesk. So this might help someone.
$requestObject = #()
$action = "Buy a new laptop"
$status = "Rejected"
if($Action){
$requestObject += #{
op = "add"
path = "/progressTrail"
value = $Action
}
}
if($Status){
$requestObject += #{
op = "replace"
path = "/status"
value = $Status
}
}
if($requestObject){
if($requestObject.Count -eq 1){
$requestBody = "[$($requestObject | ConvertTo-Json)]"
}else{
$requestBody = $requestObject | ConvertTo-Json
}
}
The following output is generated:
[
{
"path": "/progressTrail",
"op": "add",
"value": "Buy a new laptop"
},
{
"path": "/status",
"op": "replace",
"value": "Rejected"
}
]
Now if you leave $status empty for instance, you will get the following:
[{
"path": "/progressTrail",
"op": "add",
"value": "Buy a new laptop"
}]
Note that I force the square brackets, when there is only one item in my array ($requestObject.Count -eq 1). This is not very nice imo, but it does the trick.