PowerShell How to Add to JSON Array

Question

How do you add to a JSON array in PowerShell? I'm trying with the following code, but it's complaining with a "Collection was of a fixed size" exception:

$json = @"
[
  {
    "name": "First"
  },
  {
    "name": "Second"
  }
]
"@

$toAdd =@"
{
  "name": "Third"
}
"@

$jobj = ConvertFrom-Json -InputObject $json    
$jobj.Add((ConvertFrom-Json -InputObject $toAdd))

Martin Brandl · Accepted Answer · 2017-05-11 13:33:41Z

19

Just use += instead of Add():

$jobj += (ConvertFrom-Json -InputObject $toAdd)

answered May 11, 2017 at 13:33

Martin Brandl

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1 Comment

urbanSoft Over a year ago

This does not work for empty arrays: $json = '[]'. $jobj will be a single object and not an array containing the object.

Vinodraj Jayaraman · Accepted Answer · 2018-06-22 02:15:05Z

0

This works.

$js = @"
[
  {
    "name":"First"
  },
  {
    "name":"Second"
  }
]
"@

$toAdd = @"
[
  {
    "name":"Third"
  }
]
"@

$jobj = ConvertFrom-Json -InputObject $js
$jsrc = ConvertFrom-Json -InputObject $toAdd

$jobj = $jobj + $jsrc

answered Jun 22, 2018 at 2:15

Vinodraj Jayaraman

412 bronze badges

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