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Javascript Deobfuscator

Need to edit an obfuscated Javascript? This repo is the way to de-obfuscate any kind of obfuscated Javascript, especially if it comes from automatic tools like

Because obfuscation varies wildly in the internet, the process is not automatic. It won't give you one-click-and-it-done but instead it gives you a script editor with tools necessary to deobfucate any kind of javascript (provided you also familiar with how JS works of course).

Your work is automatically saved to SessionStorage so don't worry about accidental refresh or page navigation.

The Editor

This tool uses Monaco. The editor that powers VSCode. It itself can do Find + Replace, Undo + Redo, Syntax + Error highlighting, unused variables detection, and other neat stuff.

Formatting Tools

All formatting tools affects selected text, or all text in editor if none selected.

Format Document

Beautify javascript for all text in editor.

You should format your document first before doing other tasks so it reduces chance of your code become corrupt.

Simplify String simplifyString()

This reformats string '' and "". Example "\x75\x73\x65\x20\x73\x74\x72\x69\x63\x74" becomes "use strict".

Currently doesn't work with literal string. Also, it uses regex, so beware with complex string (e.g. '\'').

Simplify Number simplifyNumber()

This reformats hex number. Example 0xff becomes 255.

Simplify Object Access simplifyAccess()

This reformats object access. Example document["body"]["style"]["color"]="black"; becomes"black";

Simplify Hex Name simplifyHex()

This renames all variables _0x[Hex code] to it's shorter name (a, b, c, etc.).

Beware that this method isn't 100% safe. It can't detect any variable name collision yet.

Evaluation Tools

This is a powerful tool to let you evaluate javascript code and reveal it's hidden content.

It's advised for you to open Browser Console (Ctrl+Shift+I, tab Console) for helpful information.

Push evalPush() and Pop evalPop()

Push selected text to "code stack", or pop it.

It means to be used with eval buttons (explained below). These buttons does nothing on it's own.

Pushing to code stack means if there's line A then you push B, then the current stack will be A\nB (A followed by B in next line).

Eval Selected evalStr()

Evaluate selected code along with current variables stack on. If it returns any valid JSON value (includes array and object) it will replaces the selected code.

A practical example is like this:

var foo = {'baz' => 'bar'};
var result = foo['baz'];

If you push the first line to stack and then evalStr the text foo['baz'], it will replaced as "bar".

Eval Auto evalAuto()

Harnessing the power of regex, this "intelligently" replaces any "captured" variable in the selected code, like if you do evalStr on each one of them. If it used correctly it will definitely saves you a lot of time.

The captured variables are based on the current stack. It will detect all var/const/let. If the evaluation returns string or number, it will be replaced.

Sync Vars syncVar()

Select a word variable and any derived variable names will be magically recusively replaced. Example select foo and then let bar = foo; let baz = bar; console.log(baz) will simply become console.log(foo). Combined with evalAuto both are destructive yet very time saving operation.

Hidden Evaluation Tools

These tools are experimental. Although it's useful in certain cases. To access it you need to call the function in browser console.


Similar like evalStr, but without JSON.stringify. This is useful for extracting code out of eval string, for example.


Similar like simplifyString, but also merges string concatenation (e.g. "foo" + "bar"). Because it's flexibility, it only detects double quote "" right now. Proceed with caution.


Similar like simplifyNumber, but also merges number operations (e.g. -1 + 2). Because it's flexibility, it only detect regular number. Proceed with caution.


Split two or more concatenated const/let/var definitions in a selected single expression. It does not simply naively replace ,, it's aware about array/object presence. Because of that you can't just select multiple functions and expect it gots the effect too. Still kinda useful for readability.

Feel free to requests other operation ideas in Issue Tracker.