@office-core/exceljs

A modern, high-performance evolution of ExcelJS published as @office-core/exceljs, carrying forward its battle-tested standard into contemporary Node.js and TypeScript environments.

• Preserves full public API parity across all workbook, worksheet, styling, and streaming operations.
• Re-architected with strict TypeScript and modern runtime standards, eliminating legacy shims and loose typing.
• Significantly leaner dependency footprint, powered by high-speed parsing and modern compression primitives.
• Optimized for high-throughput data processing and low memory overhead during large streaming jobs.
• Backed by rigorous parity verification and active maintenance for demanding production workloads.

Documentation Index

Detailed documentation for @office-core/exceljs is organized into separate guides in the docs directory:

| Guide | Description | |---|---| | Getting Started & Importing | Importing syntax, ES Module usage, and browser/bundler integration. | | Workbook Operations | Creating workbooks, setting workbook properties, calculation properties, and workbook window views. | | Worksheet Operations | Adding/removing worksheets, accessing sheets, worksheet states, properties & metrics, page setup options, headers/footers, frozen & split views, and auto-filters. | | Rows, Columns & Cells | Columns setup & iteration, row getters & setters, adding/inserting/splicing/duplicating rows, cell manipulation, merged cells, defined names, data validations, cell comments, and table definitions. | | Styles & Formatting | Number formats, font specifications, alignment settings, borders, pattern & gradient fills, rich text formatting, cell protection, conditional formatting rules, outline levels, and image insertion. | | File I/O & Streaming | Reading/writing XLSX and CSV files with options, plus streaming WorkbookWriter and WorkbookReader. | | Value Types | Null, Merge, Number, String, Date, Hyperlink, Formula (Master/Shared/Array), Rich Text, Boolean, and Error value types. | | Config, Caveats & Known Issues | Dependency injection config, build artifacts caveats, and known issues. |

For a complete table of contents with all section links, see the Documentation Table of Contents.

Installation

Install via npm:

npm install @office-core/exceljs

Contributions

Contributions are very welcome! It helps to know what features are desired or what bugs are causing pain.

If you submit a pull request for a bugfix, please add a unit test or integration test that catches the problem.

Please try to avoid modifying the package version in a PR. Versions are updated on release.

All contributions added to this library will be included in the library's MIT license.