# exceljs/exceljs

Excel Workbook Manager

Repository: https://github.com/exceljs/exceljs
Canonical: https://ross.abutalabs.com/products/exceljs
Language: JavaScript
License: MIT
License Family: permissive
Topics: hacktoberfest, xlsx, xlsxwriter, xlsxreader, workbook, worksheet, csv, streaming-workbook, exceljs, xlsx-workbook, workbook-writer
Last push: 2025-01-21T16:00:46+00:00

## Health v2 (maintenance only)
Score: 24/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 2, release rhythm 8, longevity 100
- inputs: {"age_days": 4285, "days_push": 589, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 15449, forks 2036 (observed 2026-08-28T04:11:09.861946+00:00)

## What it is
ExcelJS is a Node.js library for reading, manipulating, and writing Excel XLSX workbooks and JSON, including styles, streaming, and CSV support. It is reverse-engineered from Excel spreadsheet file formats and works in both browser and Node environments.

## Use cases
- generate xlsx reports from data in node
- parse excel spreadsheets into
- export database rows to an excel workbook with styling
- read and modify existing xlsx files programmatically
- stream large excel workbooks without loading everything in memory
- convert csv to xlsx and back

## When to choose
- you need rich Excel features like styles, conditional formatting, tables, and pivot tables in JavaScript
- you need streaming read/write for large workbooks
- you want a mature, widely used MIT-licensed spreadsheet library for Node.js

## When to avoid
- you only need simple CSV parsing without Excel formatting
- you need to render or display spreadsheets in a UI rather than manipulate files
- you work with legacy .xls binary formats, which are not supported

## Facets
- artifact type: library
- maturity: active
- function: serialization, file-system, csv
- domain: files, spreadsheets, developer-tools
- platform: cross-platform
- tags: xlsx, excel, spreadsheet, workbook, streaming, nodejs

## Member repositories
- exceljs/exceljs (main) score 24

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:09.861946+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 2026-08-29T17:05:51.034919+00:00, confidence not recorded.
  - readme: https://github.com/exceljs/exceljs (fetched 2026-08-28T04:11:09.861946+00:00, sha 06276188a9ae)
- Data as of 2026-08-30T08:39:29.467469+00:00.