Insert a fresh key-value pair into a JSON document using Powershell

Recently, I've been working with a JSON file that looks like this:

{
    "buildDate":  "2017-08-16",
    "version":  "v1.2.0"
}

I've been wondering about how to add new key-value pairs to an existing JSON file. For instance, starting with the JSON above, I want to end up with something like this:

{
    "buildDate":  "2017-08-16",
    "version":  "v1.2.0",
    "newKey1": "newValue1",
    "newKey2": "newValue2"
}

Up until now, my approach for writing to JSON has been as follows:

@{buildDate="2017-08-16"; version="v1.2.0"} | ConvertTo-Json | Out-File .\data.json
jsonpowershellscripting

Answer №1

Follow these steps to manipulate JSON data using PowerShell:

$jsonfile = 'C:\path\to\your.json'

$json = Get-Content $jsonfile | Out-String | ConvertFrom-Json

$json | Add-Member -Type NoteProperty -Name 'newKey1' -Value 'newValue1'
$json | Add-Member -Type NoteProperty -Name 'newKey2' -Value 'newValue2'

$json | ConvertTo-Json | Set-Content $jsonfile

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