JavaScript Deobfuscator and Unpacker

The Unreadable option is disabled by default, because it uses data from JS Nice. This cannot be done with JavaScript. You need to install UserScript de4js_helper.user.js to enable it.

Install one of the following links:

• Open User JS
• Greasy Fork
• Github

* de4js helper doesn't work offline.

• Works offline.
• Source code beautifier / syntax highlighter.
• Makes obfuscated code readable.
• Performance unpackers:
  • Eval, e.g. Packer, WiseLoop
  • Array, e.g. Javascript Obfuscator, Free JS Obfuscator
  • _Number (not correct name)
  • Packer
  • Javascript Obfuscator
  • Free JS Obfuscator
  • Obfuscator.IO (but not all cases)
  • My Obfuscate
  • URL encode, e.g. bookmarklet
  • JSFuck
  • JJencode
  • AAencode
  • WiseLoop

docker-compose up

Preview de4js in your web browser at http://localhost:4000/de4js/

docker exec -it de4js_app bash
bundle exec jekyll build

git clone https://github.com/lelinhtinh/de4js.git
cd de4js

If you don't have Ruby installed, install Ruby 2.1.0 or higher.

Fix missing libraries on Ubuntu:

sudo apt install ruby-dev zlib1g-dev

Install Bundler:

gem install bundler

Install Jekyll and other dependencies from the GitHub Pages gem:

bundle install

Fix EventMachine C extension not loading on Windows 10:

gem uninstall eventmachine
gem install eventmachine --platform ruby

Install Workbox CLI:

npm install workbox-cli --global

npm start

Or, with livereload:

npm run watch

Preview de4js in your web browser at http://localhost:4000/de4js/

npm run build

MIT License © lelinhtinh

• lelinhtinh
• Himura2la
• Flleeppyy

• mathjs
• js-beautify
• highlight.js
• clipboard.js
• magic-check
• cat-in-136
• Decoder-JJEncode
• NotSoWise

• Icons made by Eucalyp from Flaticon.

• IlluminateJS: A static JavaScript deobfuscator.
• JStillery: Advanced JavaScript Deobfuscation via Partial Evaluation.
• Akamai Deobfuscator: A tool to help you deobfuscate Akamai scripts.
• Nice2Predict: Learning framework for program property prediction.
• Javascript deobfuscation AMA: General questions about deobfuscating JavaScript.
• Deobfuscator IO: A (incomplete) deobfuscator for scripts obfuscated with obfuscator.io (Archived).
• JavaScript Deobfuscator: Deobfuscation tool for obfuscated JavaScript using obfuscator.io.
• Prepack: A JavaScript bundle optimizer.
• JS Deobfuscate: JavaScript deobfuscate for JSjiami, Sojson, ...
• JSDec: Online JavaScript decoder. Supported sojson v4/Premium/v5 and more (No longer update).
• Synchrony: Kavascript-obfuscator cleaner & deobfuscator.

* Obfuscator.IO is always up to date. The automatic deobfuscation tools (including this project) will usually not match its latest version. But that doesn't mean it's a safe tool to secure your source code.