Format-Json Function, allowing to specify the indent level.

format-json-function.ps1

function Format-Json {
    Param(
        [Parameter(ValueFromPipeline=$True,Mandatory=$True)]
        [string]$jsondata,
        [int]$indent=2
    )
    # Processing blocks are useful for multiline JSON strings
    begin { $fullpipeline = "" }
    process { $fullpipeline += $jsondata }
    end {
        $jsonformatted += $fullpipeline | ConvertFrom-Json | ConvertTo-Json

        # ConvertTo-Json doesn't have an indentation parameter, so do it ourselves
        $nested = 1
        ($jsonformatted -split '\r\n' |
            % {
                $line = $_
                if ($_ -match '^ +') {
                    $length = $indent * $nested
                    $line = ' ' * $length + $_.TrimStart()
                    
                    # Determine the nesting of the next line
                    if ($_ -match '^*[\{|\[]$') {
                        $nested++
                    } elseif ($_ -match '^*[\}|\]]$') {
                        $nested--
                    }

                }
                Write-Output $line
            }
        ) -join "`r`n"
    }
}