Short python utility that converts a given csv to the according json. Fieldnames are taken from the first line of the csv.

csv_to_json.py

import csv
import json
import sys
 
#
#
# converts csv to json
# fieldnames are taken from the first line of the csv input file
#
# khz / 2014
#
 
if __name__ == "__main__":
    #print(sys.argv, len(sys.argv))
    filename = None
    if len(sys.argv) < 2:
        print("usage: csv_to_json.py <filename> ")
        print("       You dont need to give a file extension. The tool automatically adds .csv and .json")
        sys.exit()
    else:
        filename = sys.argv[1]
 
    csvfile = open(filename + '.csv', 'r', encoding="utf8")
    fieldnames = list(csvfile.readline().split(","))
 
    jsonfile = open(filename + '.json', 'w')
 
    
    reader = csv.DictReader( csvfile, fieldnames)
    for row in reader:
        json.dump(row, jsonfile)
        jsonfile.write('\n')

added an encoding to the open() call to make sure that python3 unicode errors wont occur.