Python 3 script to extract images from HTTP Archive (HAR) files

extract_har.py

import json
import base64
import os

# make sure the output directory exists before running!
folder = os.path.join(os.getcwd(), "imgs")

with open("scr.har", "r") as f:
    har = json.loads(f.read())

entries = har["log"]["entries"]

for entry in entries:
    mimetype = entry["response"]["content"]["mimeType"]
    filename = entry["request"]["url"].split("/")[-1]
    image64 = entry["response"]["content"]["text"]

    if mimetype == "image/webp":
        file = os.path.join(folder, "{}.webp".format(filename))
        print(file)
        with open(file, "wb") as f:
            f.write(base64.b64decode(image64))

See fork https://gist.github.com/Lewiscowles1986/645e79295efa84698f4e45cd06d610ea if you want to get jpeg+png+webp

Note that this gist will overwrite files with the same filename and different URL paths, since the code is not creating subfolders.

For updated version with subfolders creation and parametrised (specifiable) input file and output folder, see the fork here:
https://gist.github.com/FurloSK/0477e01024f701db42341fc3223a5d8c

Thank you guys. This code is so old I barely remember it =)