基于 Power Automate 流程中的子数组过滤 JSON

Question

I have some json data that I would like to filter in a Power Automate Flow.

A simplified version of the json is as follows:

[
  {
    "ItemId": "1",
    "Blah": "test1",
    "CustomFieldArray": [
      {
        "Name": "Code",
        "Value": "A"
      },
      {
        "Name": "Category",
        "Value": "Test"
      }
    ]
  },
  {
    "ItemId": "2",
    "Blah": "test2",
    "CustomFieldArray": [
      {
        "Name": "Code",
        "Value": "B"
      },
      {
        "Name": "Category",
        "Value": "Test"
      }
    ]
  }
]

For example, I wish to filter items based on Name = "Code" and Value = "A". I should be left with the item with ItemId 1 in that case.

I can't figure out how to do this in Power Automate. It would be nice to change the data structure, but this is the way the data is, and I'm trying to work out if this is possible in Power Automate without changing the data itself.

Answer 1

Firstly, I had to fix your JSON, it wasn't complete.

Secondly, filtering on sub array information isn't what I'd call easy. However, to get around the limitations, you can perform a bit of trickery.

Prior to the step above, I create a variable of type Array and called it Array .

In the step above, the left hand side expression is...

string(item()?['CustomFieldArray'])

... and the contains comparison on the right hand side is simply as you can see, a string with the appropriate filter value...

{"Name":"Code","Value":"A"}

... it's not an expression or a proper object, just a string.

If you need to enhance it to cater for case sensitive values, just set everything to lower case using the toLower expression on the left.

Although it's hard to see, that will produce your desired result...

... you can see by the vertical scrollbars that it's reduced the size of the array.