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Some value fields output data, which is 1-many, i.e. sometimes a value field can output a single data point (string or number), or one JSON object, or an array of data.

isArray signifies that a value field's output is always output as an array.

Example:

The value field 

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With this added value field, the returned search result is (the response contains data other than this single value field, but that data has been omitted for clarity's sake):

{
    "items": [
        {
            //The value field
            "Keywords": [
                "Keyword1",
                "Keyword2"
            ]            
        },
        {
			//The value field
            "Keywords": "Keyword2"       
        }
    ],
    "success": true,
    "total": "2"
}

The result contains two objects. Each of these objects have a "Keywords" property. The first object has two keywords:

"Keywords": [
                "Keyword1",
                "Keyword2"
            ]

The second object has only one keyword:

"Keywords": "Keyword2"

If we edit the value field, so that isArray is checked, the returned result is:

{
    "items": [
        {
            //The value field
            "Keywords": [
                "Keyword1",
                "Keyword2"
            ]
        },
        {
            //The value field
            "Keywords": [
                "Keyword2"
            ]
        }
    ],
    "success": true,
    "total": "2"
}

Now both of the objects' Keywords property is an array.