# Narrowing a wide JSON parameter array via script transform **URL:** \ **Category:** Ignition\ **Tags:** scripting, perspective\ **Created:** [February 23, 2024, 10:33pm UTC](https://forum.inductiveautomation.com/t/narrowing-a-wide-json-parameter-array-via-script-transform/86298 "2024-02-23T22:33:10Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![David\_Nicks](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@David\_Nicks](https://forum.inductiveautomation.com/u/David_Nicks)\ **Post date:** [February 24, 2024, 3:01pm UTC](https://forum.inductiveautomation.com/t/narrowing-a-wide-json-parameter-array-via-script-transform/86298/7 "2024-02-24T15:01:26Z")
> [@cmallonee](#): > > What's the exception/error? DotReferenceJythonMap object doesn't support item deletion. Tried your sample script and I'm getting a "Parse Error in script transform" on row\_dict = {}. (by the way, how do you copy/paste an error message when it's only visible in the tooltip when you hover over the Error\_Configuration script result in the binding dialog?) [This post](https://forum.inductiveautomation.com/t/dotreferencejythonmap-is-missing-pop-method/82178) talks about having to re-map a JythonMap into an array of dictionaries due to chained transforms. I only have one single transform here, but I tried re-mapping the JythonMap object and that seems to work: ```auto value = [dict(x) for x in value[:]] cols = ["id","loc"] result=[] for row in value: for key in row.keys(): if key not in cols: del row[key] result.append(row) return value ``` So before I move on, I'm curious if this is the best solution or if there's something else I should be doing to avoid the need to remap (ok, use a dataset result from the query, yeah I know, but is that all?). --- _[View the full topic](https://forum.inductiveautomation.com/t/narrowing-a-wide-json-parameter-array-via-script-transform/86298)._