POWERSHELL - How to access multilevel child elements in JSON file with condtion - json

Question

can someone please send me solution or link for PowerShell 5 and 7 how can I access child elements if specific condition is fulfilled for JSON file which I have as output.json. I haven't find it on the net.
I want to retrieve value of the "children" elements if type element has value FILE and to put that into some list. So final result should be [test1.txt,test2.txt]
Thank you!!!
{
"path": {
"components": [
"Packages"
],
"parent": "",
"name": "Packages",
},
"children": {
"values": [
{
"path": {
"components": [
"test1.txt"
],
"parent": "",
"name": "test1.txt",
},
"type": "FILE",
"size": 405
},
{
"path": {
"components": [
"test2.txt"
],
"parent": "",
"name": "test2.txt",
},
"type": "FILE",
"size": 409
},
{
"path": {
"components": [
"FOLDER"
],
"parent": "",
"name": "FOLDER",
},
"type": "DIRECTORY",
"size": 1625
}
]
"start": 0
}
}

Answer 1

1.) The json is incorrect, I assumt that this one is the correct one:
{
"path": {
"components": [
"Packages"
],
"parent": "",
"name": "Packages"
},
"children": {
"values": [
{
"path": {
"components": [
"test1.txt"
],
"parent": "",
"name": "test1.txt"
},
"type": "FILE",
"size": 405
},
{
"path": {
"components": [
"test2.txt"
],
"parent": "",
"name": "test2.txt"
},
"type": "FILE",
"size": 409
},
{
"path": {
"components": [
"FOLDER"
],
"parent": "",
"name": "FOLDER"
},
"type": "DIRECTORY",
"size": 1625
}
],
"start": 0
}
}
2.) The structure is not absolute clear, but for your example this seems to me to be the correct solution:
$element = $json | ConvertFrom-Json
$result = #()
$element.children.values | foreach {
if ($_.type -eq 'FILE') { $result += $_.path.name }
}
$result | ConvertTo-Json
Be aware, that the used construct $result += $_.path.name is fine if you have up to ~10k items, but for very large items its getting very slow and you need to use an arraylist. https://adamtheautomator.com/powershell-arraylist/