Call REST API from PowerShell Script

Question

How can I call a rest based API from a PowerShell script and process the Json answer?

Answer 1

We use Powershell to query a REST API that deals only with Json style data. It was awkward at first but the below code is all we need to perform most operations:

# Authentication
$webclient = New-Object System.Net.WebClient
$creds = New-Object System.Net.NetworkCredential("MyUsername","MyPassword");
$webclient.Credentials = $creds

# Data prep
$data = @{Name='Test';} | ConvertTo-Json

# GET
$webClient.DownloadString($url) | ConvertFrom-Json

# POST
$webClient.UploadString($url,'POST',$data)

# PUT
$webClient.UploadString($url,'PUT',$data)