Convert HAR files to CSV

har2csv.py

import sys
import json
import csv


def truncate(s: str, threshold: int = 120):
    return (s[:threshold] + "..") if len(s) > threshold else s


def get_headers():
    return ("URL", "Time in Seconds", "Payload", "Response")


def get_data_from_entry(entry):
    try:
        payload = entry["request"]["postData"]["text"]
    except KeyError :
        payload = ""

    return {
        "URL": entry["request"]["url"],
        "Time in Seconds": "{0:.2f}".format(entry["time"] / 1000),
        "Payload": payload,
        "Response": truncate(entry["response"]["content"]["text"]),
    }


def parse_har_file(har_file):
    har_data = open(har_file, "rb").read()
    skip = 3 if "\xef\xbb\xbf" == har_data[:3] else 0
    har = json.loads(har_data[skip:])
    return har["log"]["entries"]


if "__main__" == __name__:
    if len(sys.argv) < 2:
        print("Usage: %s <har_file>" % sys.argv[0])
        sys.exit(1)

    har_file = sys.argv[1]
    entries = parse_har_file(har_file)
    data = map(get_data_from_entry, entries)

    with open("result.csv", "w") as fp:
        writer = csv.DictWriter(fp, fieldnames=get_headers())
        writer.writeheader()
        for row in data:
            writer.writerow(row)

    print("Done!")