[Chrome/Tampermonkey] Extract *.user.js scripts from LevelDB backup

README.rst

Restoring Tampermonkey scripts

Chrome stores .user.js scripts in a .ldb, which isn't in a user accessible format to recovery. On some versions of macOS the provided python script can't compile the leveldb package. As a workaround, we can use the node level package to recover our userscripts.

Prerequisite

brew install node
npm install level

Usage

node extract.js "/Users/$(whoami)/Library/Application Support/Google/Chrome Canary/backup/Default/Default/Local Extension Settings/dhdgffkkebhmkfjojejmpbldmpobfkfo"

extract.js

const fs = require('fs');
const path = require('path');

const level = require('level');
const directory = path.resolve(process.argv.length > 2
  ? process.argv[2]
  : 'dhdgffkkebhmkfjojejmpbldmpobfkfo');
const db = level(directory);
const stream = db.createReadStream();

console.log(`Loading: ${directory}`);
const date = new Date().toISOString();
const outputDirectory = path.resolve(
  path.join(
    __dirname,
    date.slice(0, date.indexOf('T'))
  )
);

if (!fs.existsSync(outputDirectory)) {
  fs.mkdirSync(outputDirectory, true);
}
console.log(`Saving to: ${outputDirectory}`);

stream.on('data', data => {
  const { key, value } = data;
  try {
    if (value.includes('UserScript')) {
      const uuid = key.slice(key.indexOf('#') + 1);
      const parsed = JSON.parse(value).value;
      const filename = path.join(outputDirectory, `${uuid}.user.js`);
      fs.writeFile(filename, parsed, () => {
        console.log(`Saved: ${path.basename(filename)}`);
      });
    }
  } catch (err) {
  }
});

Updated script above works, thank you. For anyone else that plans to use it you have to run npm install level-read-stream as well before executing it.