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

har-extract.js

const fs = require('fs');
const file = JSON.parse(fs.readFileSync('./my-file.har')).log;
const targetMimeType = 'application/font-woff';

let count = 0;
for (const entry of file.entries) {
  if (entry.response.content.mimeType === targetMimeType) {
  	let fileName = entry.request.url.split('/').pop();
    // Ensure output directory exists before running!
    fs.writeFileSync(`./output/${fileName}`, new Buffer(entry.response.content.text, 'base64'), 'binary');
    count++;
  }
}

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