Azure Devops : Replace variable in list with unknown order - azure

Question

We are running a build pipeline in azure DevOps. After the build we deploy the stuff and substitute variables in JSON files.
I have a problem substituting a variable in a list of equal objects. My son looks like this:
"Friends": [
{ "Name": "John",
"Phone": "12345678"
},
{ "Name": "Frank",
"Phone": "12235578"
},
{ "Name": "Bill",
"Phone": "13790678"
}
]
I can substitute Franks phone using the path: Friends.1.Phone
What should I do, if the order of "Friends" is not determined and I can not use the index?
I searched for the azure plugin "variable substitution condition" but I couldn't find any useful task.

Answer 1

You can use a powershell task and use Convertfrom-Json command
$Json = #'
{
"Friends": [
{ "Name": "John",
"Phone": "12345678"
},
{ "Name": "Frank",
"Phone": "12235578"
},
{ "Name": "Bill",
"Phone": "13790678"
}
]
}
'#
$result = $Json | ConvertFrom-Json
$result.Friends[0].Phone='12345'
$result | ConvertTo-Json -Depth 4
This will change 'John' phone number.
Answer 2:
$result = $Json | ConvertFrom-Json
$result.Friends | % {if($_.name -eq 'john'){$_.phone=98765}}
$result | ConvertTo-Json -depth 10