Set Azure devops Release pipeline variable using REST API

Question

I am able to update the variable in the build pipeline using the below json body

        $body = \'
{ 
    \"definition\": {
        \"id\": 25
    },
    \"         


        

Answer 1

Set Azure devops Release pipeline variable using REST API

We could use the REST API Definitions - Get to get all the info about this definition in the body, then we could update the body and use the (Definitions - Update) to update the value of the release definition variable from a release pipeline:

PUT https://vsrm.dev.azure.com/{organization}/{project}/_apis/release/definitions/{definitionId}?api-version=5.0

Following is my test inline powershell scripts:

$url = "https://vsrm.dev.azure.com/{organization}/{project}/_apis/release/definitions/{definitionId}?api-version=5.1"

Write-Host "URL: $url"
$pipeline = Invoke-RestMethod -Uri $url -Method Get -Headers @{
    Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
}
Write-Host "Pipeline = $($pipeline | ConvertTo-Json -Depth 100)"

# Update an existing variable named TestVar to its new value 2
$pipeline.variables.TestVar.value = "789"

####****************** update the modified object **************************
$json = @($pipeline) | ConvertTo-Json -Depth 99

$updatedef = Invoke-RestMethod -Uri $url -Method Put -Body $json -ContentType "application/json" -Headers @{Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"}

write-host "==========================================================" 
Write-host "The value of Varialbe 'TestVar' is updated to" $updatedef.variables.TestVar.value

As test result, the variable TestVar updated to 789:

Update:

But I want to achieve it without updating\changing the definition

The answer is yes. You could use the Releases - Create with request body:

{
  "definitionId": Id,
  "environments": [
    {
      "variables": {
        "TestVar": {
          "value": "xxxx"
        },
        "TestVar2": {
          "value": "xxxx"
        }
      },

    }
   ],
}

For more information refer the post here.

Hope this helps.