de4js

online Free

thanhle.io.vn

🇻🇳 Vietnam

Quick Facts

Open Source

Yes GitHub

Platforms

web

API Available

no

Account

Required

Skill Level

beginner

Offline Capable

Yes

Output Formats

txt

What it does

JavaScript deobfuscator and unpacker supporting multiple formats: Eval, Array, Obfuscator.io, JSFuck, JJencode, AAencode, URLencode, Packer, JS Obfuscator, and more. Features code beautification, string unescaping, expression execution, and remote file loading. All processing happens in browser. Maintained by lelinhtinh, sponsored by Sansec.

When to use it

Quick JavaScript deobfuscation in browser
Unpacking JSFuck/JJencode/AAencode
Beautifying minified code
Analyzing obfuscator.io output

When not to use it

Batch processing multiple files
Heavily customized obfuscation
When you need CLI automation

Limitations

Browser-based only
May struggle with heavily nested obfuscation
Manual pattern selection sometimes needed

Frequently Asked Questions

Is de4js free to use?

Yes, de4js is completely free to use with no subscription required.

What platforms does de4js support?

de4js is available on Web (browser).

Does de4js require an account?

No, de4js does not require an account. You can use it without signing up.

Is de4js open source?

Yes, de4js is open source. The source code is available on GitHub.

What are the limitations of de4js?

Browser-based only May struggle with heavily nested obfuscation Manual pattern selection sometimes needed

What does de4js do?

de4js is a web-based tool for code deobfuscation, web code analysis. JavaScript deobfuscator and unpacker supporting multiple formats: Eval, Array, Obfuscator.io, JSFuck, JJencode, AAencode, URLencode, Packer, JS Obfuscator, and more. Features code beautification, stri

Related Tools

CyberChef Free

The cyber Swiss Army knife. Drag-and-drop operations into recipes for encoding, decoding, encryption, and data analysis—all in your browser.

DecodePHP

Professional IonCube decoder supporting versions 10 through 15 with PHP 7.1 to 8.4. Upload encrypted PHP files and get readable source code back.

GhostKit Free

A curated directory and browser-based toolkit for security researchers. GhostKit combines 14+ client-side tools — JS deobfuscation, encoding/decoding, URL analysis, email header parsing, hash generation, JWT/SAML decoding, and more — with a comprehensive directory of external security tools.

Hybrid Analysis Free

Free malware sandbox powered by CrowdStrike Falcon. Upload files up to 250MB for behavioral analysis and threat detection.