Generic Powershell Script for getting JSON output from a REST API

REST_GET_to_CSV.ps1

# examples:
# .\REST_GET_to_CSV_ps7.ps1 https://api.github.com/repos/powershell/powershell/issues x x

$ErrorActionPreference = "Stop"

$url = $Args[0]
$headerName = $Args[1]
$headerContent = $Args[2]
$maxRelLink = $Args[3]
$dataname = $Args[4]

$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add($headerName, $headerContent)

$allData = New-Object System.Collections.ArrayList @()

$count = 1
do {
    "Getting "+$url
    $resultsPage = Invoke-WebRequest -UseBasicParsing -Method GET -Headers $header -Uri $url
    $Content = ConvertFrom-Json $resultsPage.Content
    
    if($dataname) {
        foreach ($entry in $Content.$dataname) {
            $allData.Add($entry) | Out-Null  
        }
    } else {
        foreach ($entry in $Content) {
            $allData.Add($entry) | Out-Null  
        }
    }
    
    $url = $resultsPage.RelationLink.Next
    $count = $count + 1
} while ($url -And $count -le $maxRelLink)

$allData | ConvertTo-Csv -Delimiter ";" | Out-File -FilePath results.csv -Encoding utf8
"Nr. of results: "+$allData.Count

REST_GET_to_CSV_ps7.ps1

#Requires -Version 7.0
# examples:
# .\REST_GET_to_CSV_ps7.ps1 https://api.github.com/repos/powershell/powershell/issues x x 5

$ErrorActionPreference = "Stop"

$url = $Args[0]
$headerName = $Args[1]
$headerContent = $Args[2]
$maxRelLink = $Args[3]
$dataname = $Args[4]

$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add($headerName, $headerContent)

$results = (Invoke-RestMethod $url -FollowRelLink -MaximumFollowRelLink $maxRelLink -Headers $headers  | ForEach-Object { $_ })
if($dataname){
    $results.$dataname | ConvertTo-Csv -Delimiter ";"  | Out-File -FilePath results.csv -Encoding utf8
} else {
    $results | ConvertTo-Csv -Delimiter ";"  | Out-File -FilePath results.csv -Encoding utf8
}
"Nr. of results: "+$results.Count