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Tool

Javascript Deobfuscator

Browser-based workbench for deobfuscating JavaScript by hand, also hosted on GitHub Pages, that pairs a Monaco editor with step-by-step rewriting and evaluation commands instead of a one-click pipeline. Formatting commands beautify the code and, on a selection or the whole file, decode escaped strings, convert hex numbers, turn bracketed property access into dot notation and rename _0x-style identifiers to short names; evaluation commands push declarations onto a code stack, evaluate a selected expression against it and substitute JSON results, replace captured variables automatically and collapse chains of aliases. The README says the process is not automatic and expects the analyst to know JavaScript.

Targets
Website
Category
Website analysis tools
Relationship
Foundation tool
Sources reviewed

Requirements & limits

  • No releases or tags; the reviewed master commit of 2023-06-29 is the latest code change, and a CI workflow builds the Vite site on each push to master and deploys it to the gh-pages branch that serves the hosted copy. Running it locally needs Node.js and npm for vite serve or vite build; package.json requires Monaco Editor ^0.39.0, js-beautify ^1.14.8 and Vite ^4.3.9 and declares no Node.js version.
  • The evaluation commands pass the selected code and the code stack to JavaScript's eval in the page itself, so those parts of the obfuscated script run unsandboxed in the user's browser; the README suggests keeping the browser console open. The string, number and renaming helpers, and the console-only experimental ones, work by regular expressions, and the README warns that they can corrupt complex strings and that hex renaming does not detect name collisions.
  • Users paste in the script they analyze, and the editor contents are kept only in the tab's sessionStorage. package.json declares MIT, but the repository has no license file and GitHub detects none. This review deobfuscated no scripts, and the sources establish no REA connection.

About this entry

The description was reviewed against primary sources. This does not establish runtime testing, security auditing or verified compatibility.

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Primary sources

  1. README.md GitHub · willnode/deobfuscator · Revision 313ab0d
  2. src/tools.js GitHub · willnode/deobfuscator · Revision 313ab0d
  3. src/index.js GitHub · willnode/deobfuscator · Revision 313ab0d
  4. package.json GitHub · willnode/deobfuscator · Revision 313ab0d
  5. .github/workflows/build.yml GitHub · willnode/deobfuscator · Revision 313ab0d
  6. https://willnode.github.io/deobfuscator/

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