# duo001/evil.js

Use with caution

Repository: https://github.com/duo001/evil.js
Canonical: https://ross.abutalabs.com/products/eviljs
Language: JavaScript
License Family: other
Last push: 2022-08-19T03:47:09+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 1972, "days_push": 1475, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2548, forks 627 (observed 2026-08-28T04:07:00.384355+00:00)

## What it is
Evil.js is a JavaScript prank library that, when imported into a project, subtly sabotages built-in behavior: Array.includes lies on certain array lengths, Array.map drops elements on Sundays, setTimeout runs a second late, JSON.stringify swaps characters, and more. It is intended as a joke 'parting gift' to leave in a project, not a legitimate utility.

## Use cases
- prank a coworker's codebase before leaving a job
- demonstrate how supply-chain attacks can subtly break JavaScript apps
- teach lessons about trusting third-party dependencies
- add hidden misbehavior to a project as a joke

## When to choose
- you want a novelty prank library to inject subtle bugs into a JavaScript project
- you need a real-world example of malicious dependency behavior for security training

## When to avoid
- any real, production, or team project - it deliberately corrupts runtime behavior
- you need reliable standard library semantics
- your organization has security or code-review policies, since this is effectively a trojan dependency

## Facets
- artifact type: library
- maturity: maintenance
- function: developer-tools, security
- domain: developer-tools, programming-languages
- platform: browser
- tags: prank, joke, sabotage, evil, trojan, novelty, nodejs, javascript

## Member repositories
- duo001/evil.js (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:00.384355+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:24:33.129697+00:00, confidence not recorded.
  - readme: https://github.com/duo001/evil.js (fetched 2026-08-28T04:07:00.384355+00:00, sha db37fff079ab)
- Data as of 2026-08-30T08:39:29.467469+00:00.