I am trying to split 1 NDJSON file into multiple NDJSON files. I am able to consume and split the file, but the problem is the resulting files are ion JSON format. Is it possible to output to NDJSON format or do I have to do some string manipulation?

My input file test.json:

{"PERIOD":"2024004","JRNAL_NO":"38115"}
{"PERIOD":"2024004","JRNAL_NO":"38115"}
{"PERIOD":"2024004","JRNAL_NO":"38115"}
{"PERIOD":"2024004","JRNAL_NO":"38115"}
{"PERIOD":"2024004","JRNAL_NO":"38116"}

My powershell script so far:

$json = (Get-Content C:Temptest.json) | ConvertFrom-Json

$jnl_list = $json.JRNAL_NO | select -Unique

ForEach ($jnl in $jnl_list) {
    $Array = $json | Where-Object {$_.JRNAL_NO -eq $jnl}
    $res = ($Array | ConvertTo-Json)    
    $res | Out-File -FilePath .JNL$($jnl).json   
}

My current output. Here’s the 38115.json file:

[
    {
        "PERIOD":  "2024004",
        "JRNAL_NO":  "38115"
    },
    {
        "PERIOD":  "2024004",
        "JRNAL_NO":  "38115"
    },
    {
        "PERIOD":  "2024004",
        "JRNAL_NO":  "38115"
    },
    {
        "PERIOD":  "2024004",
        "JRNAL_NO":  "38115"
    }
]