Get value by the array element name in json - json

Question

I'm not sure how to name these elements properly, it'll be easier just to show it. I have following JSON:
{
"DEV": [
{
"GitEmail": "asd#asd.com"
}
],
"TEST": [
{
"GitEmail": "asd1#asd.com"
}
],
"PROD": [
{
"GitEmail": "asd2#asd.com"
}
]
}
I would like to get the "DEV" by providing it's email. How to implement that in powershell?

Answer 1

Something like below can help -
PS> $json = '{
"DEV": [
{
"GitEmail": "asd#asd.com"
}
],
"TEST": [
{
"GitEmail": "asd1#asd.com"
}
],
"PROD": [
{
"GitEmail": "asd2#asd.com"
}
]
}' | ConvertFrom-Json
PS> ($json.psobject.Properties | ? {$_.Value -match "asd#asd.com"}).Name
Depending on the email matches you can retrieve the environment names.

Answer 2

I can't promise there is an easier method, but this here is one way:
Given that you json is stored in a variable $json:
You can get every head object with $json.psobject.properties.name:
Input:
$json.psobject.properties.name
Output:
DEV
TEST
PROD
With this we can create a foreach loop and search for the Email:
foreach ($dev in $json.psobject.properties.name)
{
if($json.$dev.GitEmail -eq "asd#asd.com") {
echo $dev
}
}

Answer 3

I do not know any elegant way of doing it. ConvertFrom-Json does not create neat objects with easy ways to traverse them like convertfrom-xml, instead result is just a PsObject with bunch of noteproperties.
What I do in such cases is
$a= #"
{
"DEV": [
{
"GitEmail": "asd#asd.com"
}
],
"TEST": [
{
"GitEmail": "asd1#asd.com"
}
],
"PROD": [
{
"GitEmail": "asd2#asd.com"
}
]
}
"#
$JsonObject= ConvertFrom-Json -InputObject $a
$NAMES= $JsonObject|Get-Member |WHERE MemberType -EQ NOTEPROPERTY
$NAMES|Foreach-Object {IF($JsonObject.$($_.NAME).GITEMAIL -EQ 'asd#asd.com'){$_.NAME}}
Result of above is
DEV
Not pretty, not really re-usable but works.
If anyone knows a better way of going about it - I'll be happy to learn it:)