Extracts images from a .har file

extract_har_images.js

/**
 * @author Selene Blok <selene.blok@gmail.com>
 * @license MIT
 * 
 * This file requires Node.JS to run.
 * This file requires that your output-dir is already created.
 *
 * @example
 * 
 * # This will extract all JPG images from my-file.har to output-dir that originated from example.com
 * node extract_har_images.js ./my-file.har ./output-dir "example.com"
 */

const fs = require('fs');
const launchArgs = process.argv.slice(2);
const file = JSON.parse(fs.readFileSync(launchArgs[0])).log;

let count = 1;
for (const entry of file.entries) {
    if (entry.request.url.includes(launchArgs[2])) {
        // ensure output directory exists before running!
        fs.writeFileSync(`${launchArgs[1]}/${count}.jpg`, entry.response.content.text, 'base64');
        count++;
    }
}

// !NOTE we didn't find any files
if (count == 1) {
    console.error(`Couldn't find files with URL match, does your HAR contain the url you searched for?`);
}

console.log(`Grabbed ${count - 1} files`);

Worked nicely, thank you.