JavaScript DeObfuscator

JavaScript DeObfuscator is a free, no-sign-up tool that unpacks obfuscated or minified JavaScript back into a more readable, indented structure. It rebuilds line breaks, spacing, and code blocks so you can actually follow the logic again, even though original variable names are usually gone for good. Developers, security researchers, and anyone auditing a suspicious script rely on it to see what a piece of code is really doing.

How does JavaScript DeObfuscator work?

Obfuscated code is deliberately written to be hard for humans to parse, often packed into a single line with cryptic variable names and string-array lookups. The tool parses the JavaScript into an abstract syntax tree, then reprints that tree with consistent indentation, line breaks, and spacing so nested functions and conditionals become visible again. It cannot always recover the original names a developer chose, since that information is stripped out during obfuscation and never stored anywhere in the code itself.

How to use JavaScript DeObfuscator

1. Paste your obfuscated or minified JavaScript into the input box.
2. Click the deobfuscate button and let the tool rebuild the structure.
3. Copy the formatted output or download it for closer review.

Key features

• Restores indentation and line breaks in seconds.
• Handles deeply nested functions and chained expressions.
• Runs instantly with no software installation.
• Free to use with no account or sign-up required.

Related tools

Pair this with the JavaScript Beautifier for extra formatting polish, check the JavaScript Minifier to see the compressed form, or try the JavaScript Obfuscator to understand how code gets obscured in the first place.

Frequently asked questions

Is JavaScript DeObfuscator free?

Yes, the tool is completely free with no sign-up needed. You can paste as many scripts as you like without hitting a paywall.

Can it recover original variable names?

No, original variable names are lost once code is minified or obfuscated, since that information isn't preserved in the output file. The tool instead gives functions and variables cleaner formatting and structure, which makes the logic far easier to trace even with generic names.

Will it fix broken or syntax-error code?

No, the tool expects valid JavaScript syntax to parse correctly. If the input has syntax errors, correct those first, since a broken parse tree can't be reliably reformatted.

Does it work on heavily packed or eval-based scripts?

It handles most common obfuscation patterns, including string-array lookups and packed single-line code. Extremely custom or multi-layered obfuscation may only partially unpack, in which case reformatting still helps you read the outer structure.