Working with JSON - Record Count & Parsing

[weezerboy]

So now I have been able to get DeserializeJSON JSON data from a google API like this
Let me know if a larger picture of this will help.

From this code

<cfhttp url="https://storage.googleapis.com/storage/v1/b/myabc/o?prefix=products/3D/"> 

 <cfset cfData=DeserializeJSON(cfhttp.FileContent)>

The products parameter changes and will yield different results

I have never worked with JSON data before like this.

Questions:

1. What CF code can I write to determine if I have any records from the API?
2. What CF code can I write to get a record count of the JSON results?
3. What CF code can I write to extract certain fields from the JSON structure?
   For example, I need to get the all the results from the id fields in a list.

[WolfShade]

Well, the good news is that it almost looks like the API is returning the JSON in a format that you might be able to convert it into a query object, which would make things much easier, coz then you could just valueList that ID column and get all the IDs that way.

But it's been a while since I coded anything for JSON.  If you can't convert it to a query object, you might still be able to iterate the JSON object.  I'm just not sure how.

V/r,

^ _ ^

[BKBK · Accepted solution]

cfData is a struct. It contains a key-value pair. The key is called items, and it's value is an array.

Each array item is a struct. The keys in this struct are bucket, contentType, crc32c, etag, and so on. They constitute a standard, fixed set.

Now, on to your questions:

What CF code can I write to determine if I have any records from the API?

<cfif structCount(cfData) gt 0>
<!--- There are records from the API. However, the records might be empty.--->
</cfif>

What CF code can I write to get a record count of the JSON results?
<cfif structCount(cfData) gt 0>
<!--- Recordcount is arrayLen(cfData.items)--->
<cfelse>
<!--- Recordcount is 0--->
</cfif>

What CF code can I write to extract certain fields from the JSON structure?

<!--- crc32c value of first item --->
cfData.items[1]["crc32c"]

<!--- bucket value of third item --->
cfData.items[3]["bucket"]

For example, I need to get the all the results from the id fields in a list.

<!--- all the id fields --->
<cfset IDarray=arrayNew(1)>
<cfloop from="1" to="#arrayLen(cfData.items)#" index="n">
<cfset IDarray[n]=cfData.items[n]["id"]>
</cfloop>