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Last active Sep 19, 2021
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[Chrome/Tampermonky] Extract *.user.js scripts from LevelDB backup

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.


brew install node
npm install level


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

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@AlanI-xx AlanI-xx commented Jul 8, 2021

Worked well, thank you :)


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@JustMaier JustMaier commented Sep 19, 2021

Thank you!

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