I'm using ArcGIS Pro 2.0 and I've updated my system path to point to the version of Python (3.5.3) which shipped with ArcGIS Pro.

FeaturesToJSON_conversion is well documented as including a parameter for exporting to geoJSON in the new version. The desktop version of ArcPy does not include this parameter which is why I upgraded.

I receive a 999999 error when specifying geoJSON='GEOJSON'. Just to be sure I'm using the right version of ArcPy I confirmed that it can take the parameter geoJSON='NO_GEOJSON'

I know how to do this with ogr2ogr -f GeoJSON but I was hoping to stay in ArcPy this week.

This gives error 999999:

arcpy.FeaturesToJSON_conversion("lyr", r"G:\GIS_Projects\Backups\json\myjsonfeatures.json", geoJSON='GEOJSON')

but this works fine:

arcpy.FeaturesToJSON_conversion("lyr", r"G:\GIS_Projects\Backups\json\myjsonfeatures.json", geoJSON='NO_GEOJSON')

2 Answers 2


I was able to reproduce your ERROR 999999 by running this code snippet:

import arcpy

arcpy.management.CreateFishnet(r"C:\Temp\TestProject\TestProject.gdb\PolyFC", "0 0", "0 1", 1, 1, 1, 1,
                               None, "LABELS", "DEFAULT", "POLYGON")
arcpy.management.MakeFeatureLayer(r"C:\Temp\TestProject\TestProject.gdb\PolyFC", "PolyFC_Layer")
arcpy.conversion.FeaturesToJSON("PolyFC_Layer", r"C:\Temp\TestProject\PolyFC_FeaturesToJSON.json",
                                "NOT_FORMATTED", "NO_Z_VALUES", "NO_M_VALUES", "GEOJSON")

to see:

Python 3.5.3 |Continuum Analytics, Inc.| (default, Feb 22 2017, 21:28:42) [MSC v.1900 64 bit (AMD64)] on win32 Type "copyright", "credits" or "license()" for more information.

========================== RESTART: C:\Temp\test.py ========================== Traceback (most recent call last): File "C:\Temp\test.py", line 7, in "NOT_FORMATTED", "NO_Z_VALUES", "NO_M_VALUES", "GEOJSON") File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\conversion.py", line 367, in FeaturesToJSON raise e File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\conversion.py", line 364, in FeaturesToJSON retval = convertArcObjectToPythonObject(gp.FeaturesToJSON_conversion(*gp_fixargs((in_features, out_json_file, format_json, include_z_values, include_m_values, geoJSON), True))) File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\geoprocessing_base.py", line 506, in return lambda *args: val(*gp_fixargs(args, True)) arcgisscripting.ExecuteError: ERROR 999999: Error executing function. Failed to execute (FeaturesToJSON).


Consequently, I think you should report it to Esri's Technical Support as a bug.


Please note that the FeaturesToJSON tool dose not fully support the GeoJSON Specification (RFC 7946) in ArcGIS Pro 2.1.1 or previous ArcGIS versions.

Here is a output example from ArcGIS Pro 2.1.1 that clearly illustrate how the GeoJSON Specification (RFC 7946) is not fully supported:

  "type" : "FeatureCollection",
  "crs" : {
    "type" : "name",
    "properties" : {
      "name" : "EPSG:3857"

From Appendix B in RFC 7946 - The GeoJSON Format:

Appendix B. Changes from the Pre-IETF GeoJSON Format Specification This appendix briefly summarizes non-editorial changes from the 2008 specification [GJ2008].

B.1. Normative Changes

  • Specification of coordinate reference systems has been removed, i.e., the "crs" member of [GJ2008] is no longer used.

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