convert .har (Firefox browser log) to csv

har2csv.py

#!/usr/bin/python3

import json
import csv

json_file_text = ""
with open('INPUTHARJSONFILE') as file:
    json_file_text = file.read()
    
j_obj = json.loads(json_file_text)


es = j_obj ['log'] ['entries']

new_j = []
for i in range(len(es)) :
    et = es[i]
    
    new_e = {}
    
    new_e ['t'] =         et ['startedDateTime']
    new_e ['status'] =    str(et ['response'] ['status']) + ' ' + et['response']['statusText']
    new_e ['url'] =       et ['request'] ['url']
    new_e ['method'] =    et ['request'] ['method']
    new_e ['protocol'] =  new_e ['url'] .split('://') [0]
    new_e ['domain'] =  new_e ['url'] .split('://') [1] .split('/')[0]
    new_e ['file'] =  new_e ['url'] .split('://') [1] .split('/')[-1] .split('?')[0]
    new_e ['file_sfx'] = new_e ['file'] .split('.')[-1]
    new_e ['minetype'] = et ['response'] ['content'] ['mimeType'] if et ['response'] ['content'] else ''
    new_e ['bodysize'] = et ['response'] ['bodySize']
    
    new_j . append(new_e)
    
print(new_j)

keysList = list ( new_j[0].keys() )
print(keysList)

with open("OUTPUTCSVFILE.csv", "w") as csvf:
    writer = csv.DictWriter(csvf, fieldnames=keysList)
    writer.writeheader()
    for i in range(len(new_j)) :
        print(i)
        print(new_j[i])
        writer.writerow(new_j[i])