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Tool

Obfuscator.io Deobfuscator

Deobfuscator dedicated to JavaScript produced by Obfuscator.io (javascript-obfuscator), which its README says also handles most forks. Working statically on a Babel AST, it reveals strings hidden in rotated, Base64- or RC4-encoded string arrays, inlines proxy functions, simplifies objects, arithmetic and string concatenation, removes dead code and the obfuscator's anti-tamper wrappers, and reverses control-flow flattening. Its configuration is detected automatically, and the author also hosts an online version.

Targets
Website
Category
Website analysis tools
Relationship
Foundation tool
Sources reviewed

Requirements & limits

  • npm release at review: obfuscator-io-deobfuscator 1.0.6, published 2025-03-27. The reviewed main commit, merged 2026-08-09, adds unreleased improvements to string-array wrapper identification and README notes on running the CLI from source; package.json still reports 1.0.6. No GitHub releases are published.
  • Install the global obfuscator-io-deobfuscator CLI, which takes an input file and an optional output path, or build it from source with npm and TypeScript. It applies its Babel-based transformations repeatedly, for at most 50 passes; package.json declares no Node.js version range. An online version runs at obf-io.deobfuscate.io.
  • Input must be JavaScript produced by Obfuscator.io or a compatible fork; other obfuscators are out of scope, and the author's general-purpose javascript-deobfuscator covers generic patterns. The README states that it does not run untrusted code or use a sandbox; recovered strings and control flow still need checking against the original script.
  • The LICENSE file is Apache-2.0, while package.json and the npm metadata declare ISC.

About this entry

The description was reviewed against primary sources.

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Primary sources

  1. README.md GitHub · ben-sb/obfuscator-io-deobfuscator · Revision 42efc01
  2. package.json GitHub · ben-sb/obfuscator-io-deobfuscator · Revision 42efc01
  3. src/deobfuscator/deobfuscator.ts GitHub · ben-sb/obfuscator-io-deobfuscator · Revision 42efc01
  4. src/deobfuscator/helpers/strings/decoders GitHub · ben-sb/obfuscator-io-deobfuscator · Revision 42efc01
  5. src/deobfuscator/transformations/antiTamper/antiTamperRemover.ts GitHub · ben-sb/obfuscator-io-deobfuscator · Revision 42efc01
  6. LICENSE GitHub · ben-sb/obfuscator-io-deobfuscator · Revision 42efc01
  7. https://github.com/ben-sb/obfuscator-io-deobfuscator/pull/52
  8. https://www.npmjs.com/package/obfuscator-io-deobfuscator/v/1.0.6

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