https://community.appian.com/discussions/f/new-to-appian/29577/a-fromjsonwhen I run the functon a!fromJson(). It gives the error Error:== The JsonText parameter does must not be null or empty what should i doen-USTelligent Community 12https://community.appian.com/thread/117342?ContentTypeID=1Mon, 07 Aug 2023 16:26:41 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:65c3587b-6fa4-4808-8a03-3ddcab8db7d0Stefan Helzle<p>What are you trying to do here? What is this JSON data you are dealing with?</p> <p>So, the dot-notation will fail in case that field does not exists. This is what the error message means.</p> <p>You can use the index() or property() function to fetch values from fields. It allows you to provide a default value in case the field does not exist.</p><div style="clear:both;"></div>https://community.appian.com/thread/117340?ContentTypeID=1Mon, 07 Aug 2023 15:58:44 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:c3988d5a-c53b-49d1-95b8-f97fde76c3f8shifa<p>local!search:if(a!isNullOrEmpty(ri!input),</p> <p>{},</p> <p>a!fromJson(ri!input)</p> <p>),</p> <p>local!pagingInfo:a!pagingInfo(</p> <p>startIndex:local!search.startIndex,</p> <p>batchSize:local!search.batchSize</p> <p>)</p> <p></p> <p>when i apply a!nullorEmpty(ri!nput).in a!fromJson(ri!input)..It gives error at startIndex</p> <p></p> <p>error:-</p> <p>invalid index:cannot index property startIndex of type String into type List of Variant</p><div style="clear:both;"></div>https://community.appian.com/thread/117327?ContentTypeID=1Mon, 07 Aug 2023 12:54:23 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:ee0c164b-4cce-43ba-b648-de32c481fd00Stefan Helzle<p>You cannot pass a NULL value to that function. Where is this coming from? If it is OK that there is a NULL value, then wrap the call into an if() and check for NULL using a!isNullOrEmpty(). If it is NOT OK, I suggest to use the error() function to make others aware of that situation.</p><div style="clear:both;"></div>