Merge-Json.ps1

<#
.SYNOPSIS
Create a new JSON string by recursively combining the properties of JSON strings.

.INPUTS
System.String of JSON to combine.

.OUTPUTS
System.String of JSON combining the inputs.

.LINK
Merge-PSObject.ps1

.LINK
ConvertFrom-Json

.LINK
ConvertTo-Json

.EXAMPLE
'{"a":1,"b":{"u":3},"c":{"v":5}}','{"a":{"w":8},"b":2,"c":{"x":6}}' |Merge-Json.ps1

{
    "a":  {
            "w":  8
        },
    "b":  2,
    "c":  {
            "v":  5,
            "x":  6
        }
}
#>

#Requires -Version 3
[CmdletBinding()][OutputType([string])] Param(
<#
JSON string to combine. Descendant properties are recursively merged.
Primitive values are overwritten by any matching ones in the new JSON string.
#>
[Parameter(Position=0,Mandatory=$true,ValueFromPipeline=$true,ValueFromRemainingArguments=$true)][string[]] $InputObject,
# Omits white space and indented formatting in the output string.
[switch]$Compress
)
Begin {$value = [pscustomobject]@{}}
Process {$value = $value,($InputObject |ConvertFrom-Json) |Merge-PSObject.ps1}
End {$value  |ConvertTo-Json -Compress:$Compress}