Javascript Unobfuscator

JavaScript obfuscation involves transforming valid JavaScript code to make it difficult for humans to read and understand, while maintaining the exact same execution behavior.

This is done using tools called JavaScript obfuscators, which modify the code's structure without changing its underlying logic. The main goal is to complicate reverse engineering, copying, or analyzing the source code.

JavaScript deobfuscation involves analyzing and transforming obfuscated JavaScript code to make it readable and understandable again.

Common obfuscation techniques include renaming variables with short or meaningless identifiers, removing formatting, encoding strings, introducing unnecessary calculations, or using dynamic functions like eval().

Deobfuscation includes decoding encoded strings, rewriting complex expressions, and restoring more explicit variable names.

Perfect deobfuscation, meaning recovering exactly the original source code written by the author (variable names, structure, comments), is generally not possible. Obfuscation intentionally destroys semantic information not needed for execution, and this loss is irreversible.

JSFuck is a method for writing valid JavaScript with 6 characters: []()+!., similar to obfuscation.

Go to here website

Copy paste this in the address bar:javascript:for (i=0;i < document.forms.length;++i) {for(j=0;j < document.forms[i].elements.length;++j){document.forms[i].elements[j].removeAttribute("readonly"); document.forms[i].elements[j].removeAttribute("disabled");}}

Paste the obfuscated code in the lower textarea and click Decode to get something like:

Replace the eval with a document.write

Execute javascript with a JavaScript editor.

JavaScript minification involves reducing the size of JavaScript code to optimize its loading time and bandwidth consumption.

Unlike obfuscation, minification's primary goal is not to protect the code, although it does make it less readable.