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 FileMaker Pro Custom Functions

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JSONArrayLength ( JSONArrayStr )

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  Average rating: 4.5  (2 votes)
  Discuss this Custom Function

Rob Poelking, Excelisys

JSON Array Length

Sample Input:
JSONArrayLength ( ~json )

JSONArrayLength ( "badjson" )

JSONArrayLength ( JSONGetElement ( JSONSetElement ( "" ; [ "this[0].name" ; "Brian"; "" ] ; [ "this.[0].last" ; "Dunning" ; "" ]) ; "this[0]" ) )
Sample Output:

invalid json


 Then copy & paste into FileMaker Advanced's Edit Custom Function window.


Returns the length (or count) of the elements in the JSON. This includes any keys not just arrays but it's particularly useful for looping over arrays to have the count of the objects.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


Why not add some error trapping? If the json is not valid it returns 4.
Also why not have an option for starting at 0. When indexing json 0 is the first number.

Jared, Lethbridge
May 25, 2018 9:24am

The idea of adding error trapping is a great suggestion, Jared. Thanks.

I don't start at zero because the point of the function is to report how many elements are contained in the JSON object or array. Zero should suggest that no elements are contained in the object.

Rob, Cleveland
May 25, 2018 10:19am

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Answer 4 + 8 =
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