PowerShell : retrieve JSON object by field value - json

Question

Consider JSON in this format :
"Stuffs": [
{
"Name": "Darts",
"Type": "Fun Stuff"
},
{
"Name": "Clean Toilet",
"Type": "Boring Stuff"
}
]
In PowerShell 3, we can obtain a list of Stuffs :
$JSON = Get-Content $jsonConfigFile | Out-String | ConvertFrom-Json
Assuming we don't know the exact contents of the list, including the ordering of the objects, how can we retrieve the object(s) with a specific value for the Name field ?
Brute force, we could iterate through the list :
foreach( $Stuff in $JSON.Stuffs ) {
But I am hopeful there exists a more direct mechanism ( similar to Lync or Lambda expressions in C# ).

Answer 1

$json = #"
{
"Stuffs":
[
{
"Name": "Darts",
"Type": "Fun Stuff"
},
{
"Name": "Clean Toilet",
"Type": "Boring Stuff"
}
]
}
"#
$x = $json | ConvertFrom-Json
$x.Stuffs[0] # access to Darts
$x.Stuffs[1] # access to Clean Toilet
$darts = $x.Stuffs | where { $_.Name -eq "Darts" } #Darts

Answer 2

I just asked the same question here: https://stackoverflow.com/a/23062370/3532136
It has a good solution. I hope it helps ^^.
In resume, you can use this:
The Json file in my case was called jsonfile.json:
{
"CARD_MODEL_TITLE": "OWNER'S MANUAL",
"CARD_MODEL_SUBTITLE": "Configure your download",
"CARD_MODEL_SELECT": "Select Model",
"CARD_LANG_TITLE": "Select Language",
"CARD_LANG_DEVICE_LANG": "Your device",
"CARD_YEAR_TITLE": "Select Model Year",
"CARD_YEAR_LATEST": "(Latest)",
"STEPS_MODEL": "Model",
"STEPS_LANGUAGE": "Language",
"STEPS_YEAR": "Model Year",
"BUTTON_BACK": "Back",
"BUTTON_NEXT": "Next",
"BUTTON_CLOSE": "Close"
}
Code:
$json = (Get-Content "jsonfile.json" -Raw) | ConvertFrom-Json
$json.psobject.properties.name
Output:
CARD_MODEL_TITLE
CARD_MODEL_SUBTITLE
CARD_MODEL_SELECT
CARD_LANG_TITLE
CARD_LANG_DEVICE_LANG
CARD_YEAR_TITLE
CARD_YEAR_LATEST
STEPS_MODEL
STEPS_LANGUAGE
STEPS_YEAR
BUTTON_BACK
BUTTON_NEXT
BUTTON_CLOSE
Thanks to mjolinor.

Answer 3

David Brabant's answer led me to what I needed, with this addition:
x.Stuffs | where { $_.Name -eq "Darts" } | Select -ExpandProperty Type

Answer 4

Hows about this:
$json=Get-Content -Raw -Path 'my.json' | Out-String | ConvertFrom-Json
$foo="TheVariableYourUsingToSelectSomething"
$json.SomePathYouKnow.psobject.properties.Where({$_.name -eq $foo}).value
which would select from json structured
{"SomePathYouKnow":{"TheVariableYourUsingToSelectSomething": "Tada!"}
This is based on this accessing values in powershell SO question
. Isn't powershell fabulous!

Answer 5

In regards to PowerShell 5.1 ...
Operating off the assumption that we have a file named jsonConfigFile.json with the following content from your post:
{
"Stuffs": [
{
"Name": "Darts",
"Type": "Fun Stuff"
},
{
"Name": "Clean Toilet",
"Type": "Boring Stuff"
}
]
}
This will create an ordered hashtable from a JSON file to help make retrieval easier:
$json = [ordered]#{}
(Get-Content "jsonConfigFile.json" -Raw | ConvertFrom-Json).PSObject.Properties |
ForEach-Object { $json[$_.Name] = $_.Value }
$json.Stuffs will list a nice hashtable, but it gets a little more complicated from here. Say you want the Type key's value associated with the Clean Toilet key, you would retrieve it like this:
$json.Stuffs.Where({$_.Name -eq "Clean Toilet"}).Type
It's a pain in the ass, but if your goal is to use JSON on a barebones Windows 10 installation, this is the best way to do it as far as I've found.

Answer 6

This is my json data:
[
{
"name":"Test",
"value":"TestValue"
},
{
"name":"Test",
"value":"TestValue"
}
]
Powershell script:
$data = Get-Content "Path to json file" | Out-String | ConvertFrom-Json
foreach ($line in $data) {
$line.name
}