I want to convert some json data being returned from a request to a feature class, but I keep getting a RuntimeError: Object: Error in executing tool. I made a test gdb in a folder 'C:/Workspace/Sandbox/ScratchTests/cslf.gdb' in which to populate my new feature class after conversion. To test that the request is correct and that I am returning Json data, I added a couple of print statements. Otherwise, everything is pretty straight forward. Does anyone see a problem with my code? I am following the arcpy [JSON to Features][1] directions from the documentation. The only thing I am doing differently is instead of using an actual file, I am just plugging in the variable 'cslfJson`.

import arcpy, sys, os, arcgis, requests
arcpy.env.workspace = "C:/Workspace/Sandbox/ScratchTests"

params = {'f': 'json', 'where': '1=1', 'geometryType': 'esriGeometryPolygon', 'spatialRel': 'esriSpatialRelIntersects','outFields': '*', 'returnGeometry': 'false'}
r = requests.get('https://hazards.fema.gov/gis/nfhl/rest/services/CSLF/Prelim_CSLF/MapServer/3/query', params)

cslfJson = r.json()

arcpy.JSONToFeatures_conversion(cslfJson, os.path.join("cslf.gdb", "cslf"))

Also, Here's the Traceback:

https://hazards.fema.gov/gis/nfhl/rest/services/CSLF/Prelim_CSLF/MapServer/3/query?f=json&where=1%3D1&geometryType=esriGeometryPolygon&spatialRel=esriSpatialRelIntersects&outFields=%2A&returnGeometry=false Traceback (most recent call last):

File "", line 1, in runfile('C:/Workspace/Sandbox/ScratchTests/CSLF.py', wdir='C:/Workspace/Sandbox/ScratchTests')

File "C:\Users\jbridwell\AppData\Local\Continuum\anaconda3\envs\acrpro\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 668, in runfile execfile(filename, namespace)

File "C:\Users\jbridwell\AppData\Local\Continuum\anaconda3\envs\acrpro\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 108, in execfile exec(compile(f.read(), filename, 'exec'), namespace)

File "C:/Workspace/Sandbox/ScratchTests/CSLF.py", line 20, in arcpy.JSONToFeatures_conversion(cslfJson, os.path.join("cslf.gdb", "cslf"))

File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\conversion.py", line 403, in JSONToFeatures raise e

File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\conversion.py", line 400, in JSONToFeatures retval = convertArcObjectToPythonObject(gp.JSONToFeatures_conversion(*gp_fixargs((in_json_file, out_features), True)))

File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\geoprocessing_base.py", line 506, in return lambda *args: val(*gp_fixargs(args, True))

RuntimeError: Object: Error in executing tool

[1]: http://desktop.arcgis.com/en/arcmap/10.3/tools/conversion-toolbox/json-to-features.htm

  • whats the error you're getting? there was a known BUG in their PRO release be sure to have the latest patch to circumvent this known issue.
    – NULL.Dude
    Commented Aug 20, 2018 at 13:37
  • Hmmm, I'll add the traceback, but actual error I'm seeing (I'm using Spyder with Python 3.6 from AcrGIS Pro), was RuntimeError: Object: Error in executing tool. See the Traceback for details.
    – gwydion93
    Commented Aug 20, 2018 at 13:51
  • yah be sure to install the 2.2 patch
    – NULL.Dude
    Commented Aug 20, 2018 at 16:35

2 Answers 2


Be sure to have the latest ArcGIS PRO patch release (2.2.1)

There were known issues in previous releases dealing with JSON conversions.

  • BUG-000115464

GeoJSON to Features crashes ArcGIS Pro at GPCoreFunctions!Bucket_JSON2F::UnionProperties (gpesrijsontofeaturesfunction.cpp @ 1029).

  • BUG-000110564

The Key Metadata function fails to run a JSON Metadata String in ArcGIS Pro, even with a valid input.

these BUGS are not limited to your issue but will affect your processing. Implement the patch and see if it clears the problem.

  • I'm running 2.1.2. Will the latest patch work with my version (2.2)?
    – gwydion93
    Commented Aug 20, 2018 at 19:02
  • no you need to update PRO to 2.2.1
    – NULL.Dude
    Commented Aug 20, 2018 at 19:14

I was actually able to get this to work without updating to 2.2. Essentially, I had to turn the json data into a physical file in order for it to work. This is a little cumbersome, but as the file should get overwritten each time I run the script (as the REST service data is updated) it should be fine. I just added a part at then end to open a file and then write to that file, then use the newly created json file in JSONToFeatures_conversion:

cslfJson = r.json()
path = r"C:/Workspace/Sandbox/ScratchTests/cslf.json"
with open(path, 'w') as f:
     json.dump(cslfJson, f, indent=2)

arcpy.JSONToFeatures_conversion("cslf.json", os.path.join("cslf.gdb", "cslf"))

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