# cthackers/adm-zip

A Javascript implementation of zip for nodejs. Allows user to create or extract zip files both in memory or to/from disk

Repository: https://github.com/cthackers/adm-zip
Canonical: https://ross.abutalabs.com/products/adm-zip
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2026-08-11T18:23:40+00:00

## Health v2 (maintenance only)
Score: 92/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 80, longevity 100
- inputs: {"age_days": 5306, "days_push": 22, "days_rel": 54, "gap_med": 49.5, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2178, forks 381 (observed 2026-08-28T04:06:22.973093+00:00)

## What it is
ADM-ZIP is a pure JavaScript zip library for NodeJS with no external dependencies. It can create, read, update, and extract zip archives either in memory buffers or directly to/from disk, including support for Electron's original-fs.

## Use cases
- extract zip files to disk in node
- create zip archives from files or buffers
- read zip entry contents in memory without writing to disk
- add, update, or delete files inside an existing zip
- package files into a zip buffer to send over http
- work with zips inside electron apps using original-fs

## When to choose
- you need a zero-dependency zip library for NodeJS
- you want to manipulate zip archives in memory as buffers
- you need to modify existing zips (add/update/delete entries)
- you're building an Electron app that needs zip support

## When to avoid
- you need maximum compression performance or native speed
- you need formats other than zip (tar, gzip, 7z)
- you need streaming processing of very large archives
- you need advanced encryption features beyond password-protected reading

## Facets
- artifact type: library
- maturity: active
- function: compression, file-system, serialization
- domain: files, developer-tools, backend
- platform: cross-platform
- tags: zip, unzip, archive, electron, pure-javascript, in-memory, nodejs

## Member repositories
- cthackers/adm-zip (main) score 92

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:22.973093+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 2026-08-30T02:48:48.486320+00:00, confidence not recorded.
  - readme: https://github.com/cthackers/adm-zip (fetched 2026-08-28T04:06:22.973093+00:00, sha 9d05e156889b)
  - registry_npm: https://registry.npmjs.org/adm-zip (fetched 2026-08-29T10:29:00.457846+00:00, sha 5de19fe8a6be)
- Data as of 2026-08-30T08:39:29.467469+00:00.