exceljs/exceljs

Health v2 · maintenance only

Adoption not part of the score

15449 stars · 2036 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

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

library · maturity active

serialization file-system csv files spreadsheets developer-tools cross-platform xlsx excel spreadsheet workbook streaming nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="exceljs/exceljs")