sort json object by keys

sort-json.ps1

function Sort-Json($json) {
  $t = `
      Get-Content $json -Encoding UTF8 | `
      ConvertFrom-Json; 
  $tmp = New-Object -Type psobject; 
  $t.psobject.properties | `
      Select-Object -Expand name | `
      Sort-Object | `
      ForEach-Object { $tmp | `
          Add-Member -Type noteproperty -Name $_ -Value $t.$_ 
      }; 
  $tmp | `
      ConvertTo-Json | `
      Out-File $json -Encoding UTF8NoBOM;
}