Download GeoJSON from an ArcGIS API

arcgis.py

#!/usr/bin/env python

import sys
import json
from esridump.dumper import EsriDumper

url = sys.argv[1]

dumper = EsriDumper(url, fields=None)

response = dumper._request("GET", url)
dumper.get_metadata()

print('{"type":"FeatureCollection","features":[', end="")
sep = "\n"

for feature in dumper:
    print(sep, json.dumps(feature), sep="", end="")
    sep = ",\n"

print("]}")