Rough script to extract images from HTTP Archive (HAR) files

har-extract.js

const fs = require('fs');
const file = JSON.parse(fs.readFileSync('./dump.har')).log;
const targetMimeType = 'image/jpeg';

let count = 1;
for (const entry of file.entries) {
  if (entry.response.content.mimeType === targetMimeType) {
    // ensure output directory exists before running!
    fs.writeFileSync(`output/${count}.png`, new Buffer(entry.response.content.text, 'base64'), 'binary');
    count++;
  }
}

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