The .CSV file has 6 indents, we need to append all the indent with GeoJSON file and updated file ready for open in QGIS

    import json
    import copy
    import csv
    import sys


    def read_in_csv(csvfile):
    with open (csvfile.csv, 'rb') as f:
        reader = csv.reader(f)
        header = (f.next()).strip('\n').strip('\t')
        properties = list(reader)
        flatlist_properties = [x for y in properties for x in y]
    return flatlist_properties, header 

    def append_properties_to_geojson(csvfile, geojsonfile):
        data = json.loads(open(geojsonfile).read())
        data = copy.deepcopy(data)
        values_to_add = read_in_csv(csvfile)[0]
            for entry in range(len(data["features"])):
            data["features"][entry]["properties"][read_in_csv(csvfile)[1]] = values_to_add[entry]
        print ("Note: Your CSV and geojson features do not contain the same number of values")
    return data 

    if __name__ == "__main__":
    csvfile = sys.argv[1]
    geojsonfile = sys.argv[2]

    with open('updated_data.json', 'w') as outfile:
        json.dump(append_properties_to_geojson(csvfile, geojsonfile), outfile, indent=6)

    print ("Data dumped into 'updated_data.json'")

# Usage: python add_csv_to_geojson.py csvfile.csv geojsonfile.json

Error show

    ['add_csv_to_geojson.py', 'csvfile.csv', 'geojsonfile.geojson']
    Traceback (most recent call last):
    File "add_csv_to_geojson.py", line 37, in <module>
    json.dump(append_properties_to_geojson(csvfile, geojsonfile), outfile,  indent=4)
    File "add_csv_to_geojson.py", line 22, in append_properties_to_geojson
    data = json.loads(open(geojsonfile).read())
    File "C:\Program Files\Python37\lib\json\__init__.py", line 348, in loads
    return _default_decoder.decode(s)
    File "C:\Program Files\Python37\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    File "C:\Program Files\Python37\lib\json\decoder.py", line 355, in  raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
    json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

1 Answer 1


I would recommend geopandas. Attribute Join documentation.

Here is how I would do it (Note: I haven't tried your data yet):

import pandas
import geopandas

gdf = geopandas.read_file(...) # geojson file
pdf = pandas.read_csv(...) # CSV file

joined_gdf = gdf.merge(pdf, on="state_name")
joined_gdf.to_file(..., driver="GeoJSON")
  • Thank you, Its works on shapefile only
    – Noor Hasan
    Commented Apr 21, 2020 at 14:51
  • Should work for geojson as well.
    – snowman2
    Commented Apr 21, 2020 at 15:23
  • @snowman2....When I work with the geojson file the error shows "fiona.errors.DriverError: 'geojsonfile.geojson' not recognized as a supported file format." can you please fix this issues to read and merge the geojson file
    – Noor Hasan
    Commented Apr 23, 2020 at 20:37
  • I just checked your geojson file and it is invalid geosjon. It starts with var geoStates = and it is missing , in some places. Once you fix that, then it should work.
    – snowman2
    Commented Apr 24, 2020 at 2:18

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