ColdFusion looping over an array with an empty/undefined field - coldfusion

Question

I am downloading data from an API from one of our vendors. The data is an array but some of the fields are empty and come over as undefined. I am able to get most of the information out with a loop but when I add the field "notes" it fails with the error of:
"Element notes is undefined in a CFML structure referenced as part of an expression. The specific sequence of files included or processed is:
C:\websites\Fire\Reports\xml_parse\Crewsense_payroll_loop.cfm, line:
21 "
When I look at the dump I see that the field shows as "undefined". I've run out of ideas. Any help would be greatly appreciated. I've included the entire code and a link to the dump showing the array.
<cfhttp url="https://api.crewsense.com/v1/payroll? access_token=as;lkdfj;alskdfj;laksdfj&token_type=bearer&start=2019-01-05%2019:00:00&end=2019-01-06%2007:59:00" method="GET" resolveurl="YES" result="result">
</cfhttp>
<cfoutput>
<cfset ApiData = deserializeJSON(result.filecontent)>
<cfset API_ArrayLength = arraylen(ApiData)>
<cfloop index="i" from="1" to=#API_ArrayLength#>
#i# #ApiData[i]["name"]#
#ApiData[i]["employee_id"]#
#ApiData[i]["start"]#
#ApiData[i]["end"]#
#ApiData[i]["total_hours"]#
#ApiData[i]["work_type"]#
#ApiData[i]["work_code"]#
#ApiData[i]["user_id"]#
#ApiData[i]["notes"]# <---Fails here when added--->
<cfset i = i+1>
<br>
</cfloop>
<cfdump var="#ApiData#">
</cfoutput>
Dump

Answer 1

When dealing with data structures that have optional elements you will need to check for their existence before trying to access them. Otherwise you will get that error. I have added a snippet with an if condition utilizing the structKeyExists() function to your code as an example.
<cfhttp url="https://api.crewsense.com/v1/payroll? access_token=as;lkdfj;alskdfj;laksdfj&token_type=bearer&start=2019-01-05%2019:00:00&end=2019-01-06%2007:59:00" method="GET" resolveurl="YES" result="result">
</cfhttp>
<cfoutput>
<cfset ApiData = deserializeJSON(result.filecontent)>
<cfset API_ArrayLength = arraylen(ApiData)>
<cfloop index="i" from="1" to=#API_ArrayLength#>
#i# #ApiData[i]["name"]#
#ApiData[i]["employee_id"]#
#ApiData[i]["start"]#
#ApiData[i]["end"]#
#ApiData[i]["total_hours"]#
#ApiData[i]["work_type"]#
#ApiData[i]["work_code"]#
#ApiData[i]["user_id"]#
<cfif structKeyExists(ApiData[i],"notes")>
#ApiData[i]["notes"]# <!--- Show 'notes' if it exists --->
<cfelse>
'notes' is not available <!--- Do something here (or not) --->
</cfif>
<cfset i = i+1>
<br>
</cfloop>
<cfdump var="#ApiData#">
</cfoutput>