PowerShell JSON and YAML

flatten.ps1

#!/usr/bin/env pwsh
# NOTE: Strips out false and null.
(gc file1.json -raw) | jq '[paths(scalars) as $path | { ($path | map(tostring) | join(\".\")): getpath($path) } ] | add'

merge.ps1

#!/usr/bin/env pwsh
@((gc file1.json -raw),(gc file2.json -raw)) | jq -s '.[0] * .[1]'

replace.ps1

#!/usr/bin/env pwsh
# NOTE: Interpolates ${some.path} with the value found at that path. Alternative method handles json values except for null

Function Get-ObjPath($obj, $objPath ) {
  $pathParts = $objPath.split(".");
  $output = $obj;
  foreach ( $nested in $pathParts ) {
    $output = $output.$nested;
    if(!$output) { return $output; }
  }
  return $output;
}

$merged = @((gc file1.json -raw),(gc file2.json -raw)) | jq -s '.[0] * .[1]'
$merged

$mergedObj = $merged | ConvertFrom-Json
$filled = [regex]::Replace(($merged),"\$\{([^}]+)?\}",{param($match) "$(Get-ObjPath $mergedObj $match.Groups[1].Value)"})
# $filled = [regex]::Replace(($merged),"`"\$\{([^}]+)?\}`"",{param($match) "$(Get-ObjPath $mergedObj $match.Groups[1].Value | ConvertTo-Json)"})
$filled | ConvertFrom-Json | ConvertTo-Json -Depth 10 # -Compress

yaml.ps1

#!/usr/bin/env pwsh

if (!(Get-Module -ListAvailable -Name powershell-yaml)) { Install-Module -Scope CurrentUser -Name powershell-yaml -RequiredVersion 0.4.0 -Confirm:$False -Force }
if (!(Get-Module -ListAvailable -Name powershell-yaml)) { exit }

$yaml = (gc file1.yaml) | Out-String | ConvertFrom-Yaml
$json = $yaml | ConvertTo-Json -Depth 10

# Use jq on object if needed