If you get internet not available while running powershell script

You may get error like
WARNING: Unable to download from URI 'https://go.microsoft.com/fwlink/?LinkID=627338&clcid=0x409' to ''.
WARNING: Unable to download the list of available providers. Check your internet connection.
PackageManagement\Get-PackageProvider : Unable to find package provider 'NuGet'. It may not be imported yet. Try 
'Get-PackageProvider -ListAvailable'.

At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:7415 char:30


Open Powershell in admin mode and run following command.

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

JSON Variable Substitution in Azure DevOps

for the JSON file with Array,

{
"City"[
{
"Name": "Sydney"
},
"Name": " Melbourne"
]
}

If you want to replace say Sydney with Perth, you need to create the variable Name as

City.0.Name

To access Melbourne,
City.1.Name

Arrays should be accessed using index and should go with . (dot) in the variable name.

I'm using File Transform Task in Azure DevOps.

ref:
JSON variable substitution example