Recently I stuck in a situation where I wanted to export variable groups from my VSTS account but there was no such option to export variable group. That time I came to know that VSTS has also exposed its API. After that, I just wrote a PowerShell to download all variable groups into a JSON file by calling its API.

PowerShell code to export variable group into JSON file

   [string]$vstsAccount = 'yourAccountName', #
   [string]$projectName = 'yourProjectName',
   [string]$user = '',
   [string]$token = 'werkwfj080dcmoirjfmwj98eh9fenc',
   [string]$pathToSave =  "C:\Users\ankushjain\Desktop\VariableGroupFolder"


# Base64-encodes the Personal Access Token (PAT) appropriately
[string]$base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $user,$token)))

[string]$vstsApiBaseUrl = "https://$$projectName"

[string]$apiUrlGetVariableGroups = "$vstsApiBaseUrl/_apis/distributedtask/variablegroups?api-version=4.1-preview.1"

# this method delete all files & folder of destination folder
Function CleanOuputFolder{
	Get-ChildItem -Path $pathToSave -Recurse| Foreach-object {Remove-item -Recurse -path $_.FullName }

# this method downloads variable groups
Function DownloadVariableGroups{
	Write-Output "Downloading variable groups"

	$variableGroupResult =  Invoke-RestMethod -Uri $apiUrlGetVariableGroups -Method Get -ContentType "application/json" -Headers @{Authorization=("Basic {0}" -f $base64AuthInfo)}

	$variableGroupResult | ConvertTo-Json -depth 100 | Set-Content "$pathToSave\VariableGroups.json"

	Write-Output "Variable groups downloaded successfully"


# clear output folder

# call api to download variable groups