How to output as csv from invoke-restmethod

$user = "GastoneCanali"
$csvPath = ".\$user-repos.csv"

try {
    $repos = Invoke-RestMethod -Uri "https://api.github.com/users/$user/repos" `
               -Headers @{'Accept'='application/vnd.github+json'; 'X-GitHub-Api-Version'='2022-11-28'}
    
    $repos | ForEach-Object {
        [PSCustomObject]@{
            Name = $_.name
            Description = $_.description
            Language = if($_.language){$_.language}else{"N/A"}
            Stars = $_.stargazers_count
            Forks = $_.forks_count
            Updated = ([datetime]$_.pushed_at).ToString("yyyy-MM-dd")
            URL = $_.html_url
        }
    } | Export-Csv -Path $csvPath -NoTypeInformation -Encoding UTF8
    
    Write-Host "Exported $(Import-Csv $csvPath | Measure-Object).Count repos to $csvPath" -ForegroundColor Green
   
}
catch {
    Write-Host "Error: $($_.Exception.Message)" -ForegroundColor Red
}

The process works because Invoke-RestMethod automatically converts a JSON API response into PowerShell objects. To get a CSV, you simply pass these objects to the Export-Csv cmdlet. Use the -NoTypeInformation parameter to create a clean file without the object type header. If you need to filter or reshape the data first, you can use Select-Object in the pipeline to choose specific properties before exporting.

DeepakMhaskar 

As VasilMichev said, it depends on the type of the response received.

If you get a response in JSON format, the Powershell itself converts the JSON response into Powershell object (psobject), if the returned Powershell object is array, you can simply export it using Export-Csv command.

$apiUrl = "https://graph.microsoft.com/v1.0/users"
$response = Invoke-RestMethod -Headers @{Authorization = "Bearer $accessToken"} -Uri $apiUrl -Method Get

$users = $response.value
$users | Export-Csv -Path "C:\Users.csv" -NoTypeInformation
####
$users | Select displayName,userPrincipalName | Export-Csv -Path "C:\Users.csv" -NoTypeInformation

if your response is not in the required format, then you have to form required JSON string from the response and convert to ps object.

Really depends on the output you are getting. Example query might help.