storing foreach loop output to an array - arrays

Question

Have a JSON array with same key values , want to loop through those and get one key of the same value of the array and store the output to an array
{
"contents":[
{
"name":"windows-Instance",
"Buildid":"1234",
"Buildtime":"1563350400238"
},
{
"name":"linux-Instance",
"Buildid":"1454",
"Buildtime":"1563264000198"
},
{
"name":"linux-Instance",
"Buildid":"1278685",
"Buildtime":"1563177600092"
}
]
}
Here is code i tried and doesn't give any output.
$result = #()
foreach ($Builtime in $contents) {
}
return $result

Answer 1

You can do it like this:
First convert the json string to an object:
$contents = '{
"contents":[
{
"name":"windows-Instance",
"Buildid":"1234",
"Buildtime":"1563350400238"
},
{
"name":"linux-Instance",
"Buildid":"1454",
"Buildtime":"1563264000198"
},
{
"name":"linux-Instance",
"Buildid":"1278685",
"Buildtime":"1563177600092"
}
]
}' | ConvertFrom-Json
Than retrieve the required properties:
$result = $contents | Select-Object -ExpandProperty "contents" | Select-Object -ExpandProperty "Buildtime"

Answer 2

You could loop over the JSON and create a custom-object that would allow you to further "manipulate" the data if needed.
Otherwise the example of #mhu is a perfect onliner
$json_content = (Get-Content ".\sample.json") | ConvertFrom-Json
$result = foreach ($content in $json_content."contents") {
[PSCustomObject]#{
"Buildtime" = $content."Buildtime"
}
}