XLSB / XLSX / XLSM (Excel 2007+ Spreadsheet) parser

npm install xlsx
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Currently a parser for XLSX/XLSM/XLSB files. Cleanroom implementation from the ISO 29500 Office Open XML specifications, [MS-XLSB], and related documents.


In node:

npm install xlsx

In the browser:

<!-- This is the only file you need (includes xlsx.js and jszip) -->
<script lang="javascript" src="dist/xlsx.core.min.js"></script>

In bower:

bower install js-xlsx

CDNjs automatically pulls the latest version and makes all versions available at http://cdnjs.com/libraries/xlsx

Older versions of this README recommended a more explicit approach:

<!-- JSZip must be included before xlsx.js -->
<script lang="javascript" src="/path/to/jszip.js"></script>
<script lang="javascript" src="/path/to/xlsx.js"></script>

Optional Modules

The node version automatically requires modules for additional features. Some of these modules are rather large in size and are only needed in special circumstances, so they do not ship with the core. For browser use, they must be included directly:

<!-- international support from https://github.com/sheetjs/js-codepage -->
<script src="dist/cpexcel.js"></script>

An appropriate version for each dependency is included in the dist/ directory.

The complete single-file version is generated at dist/xlsx.full.min.js


Simple usage (walks through every cell of every sheet and dumps the values):

var XLSX = require('xlsx');
var workbook = XLSX.readFile('test.xlsx');
var sheet_name_list = xlsx.SheetNames;
sheet_name_list.forEach(function(y) {
  var worksheet = workbook.Sheets[y];
  for (z in worksheet) {
    if(z[0] === '!') continue;
    console.log(y + "!" + z + "=" + JSON.stringify(worksheet[z].v));

The node version installs a binary xlsx2csv which can read XLSX/XLSM/XLSB files and output the contents in various formats. The source is available at xlsx2csv.njs in the bin directory.

See http://oss.sheetjs.com/js-xlsx/ for a browser example.

Note that older versions of IE does not support HTML5 File API, so the base64 mode is provided for testing. On OSX you can get the base64 encoding by running:

$ <target_file.xlsx base64 | pbcopy # the pbcopy puts the content in the clipboard

Some helper functions in XLSX.utils generate different views of the sheets:

  • XLSX.utils.sheet_to_csv generates CSV
  • XLSX.utils.sheet_to_row_object_array interprets sheets as tables with a header column and generates an array of objects
  • XLSX.utils.get_formulae generates a list of formulae

For more details:

  • bin/xlsx2csv.njs is a tool for node
  • index.html is the live demo
  • bits/90_utils.js contains the logic for generating CSV and JSON from sheets

Cell Object Description

.SheetNames is an ordered list of the sheets in the workbook

.Sheets[sheetname] returns a data structure representing the sheet. Each key that does not start with ! corresponds to a cell (using A-1 notation).

.Sheets[sheetname][address] returns the specified cell:

  • .v : the raw value of the cell
  • .w : the formatted text of the cell (if applicable)
  • .t : the type of the cell (constrained to the enumeration ST_CellType as documented in page 4215 of ISO/IEC 29500-1:2012(E) )
  • .f : the formula of the cell (if applicable)
  • .r : the rich text encoding of a cell text (if applicable)
  • .h : an HTML rendering of the rich text (if applicable)
  • .c : comments associated with the cell
  • .z : the number format string associated with the cell (if requested)
  • .l : the hyperlink of the cell (.Target holds link, .tooltip is tooltip)

For dates, .v holds the raw date code from the sheet and .w holds the text


The exported read and readFile functions accept an options argument:

Option Name Default Description
cellFormula true Save formulae to the .f field **
cellHTML true Parse rich text and save HTML to the .h field
cellNF false Save number format string to the .z field
sheetStubs false Create cell objects for stub cells
sheetRows 0 If >0, read the first sheetRows rows **
bookDeps false If true, parse calculation chains
bookFiles false If true, add raw files to book object **
bookProps false If true, only parse enough to get book metadata **
bookSheets false If true, only parse enough to get the sheet names
bookVBA false If true, expose vbaProject.bin to vbaraw field **
  • cellFormula only applies to constructing XLSB formulae. XLSX/XLSM formulae are stored in plaintext, but XLSB formulae are stored in a binary format.
  • Even if cellNF is false, formatted text (.w) will be generated
  • In some cases, sheets may be parsed even if bookSheets is false.
  • bookSheets and bookProps combine to give both sets of information
  • Deps will be an empty object if bookDeps is falsy
  • bookFiles adds a keys array (paths in the ZIP) and a files hash (whose keys are paths and values are objects representing the files)
  • sheetRows-1 rows will be generated when looking at the JSON object output (since the header row is counted as a row when parsing the data)
  • bookVBA merely exposes the raw vba object. It does not parse the data.

The defaults are enumerated in bits/84_defaults.js

Tested Environments

  • Node 0.8.14, 0.10.1
  • IE 6/7/8/9/10 using Base64 mode (IE10/11 using HTML5 mode)
  • FF 18 using Base64 or HTML5 mode
  • Chrome 24 using Base64 or HTML5 mode

Tests utilize the mocha testing framework. Travis-CI and Sauce Labs links:

Test Files

Test files are housed in another repo.


make test will run the node-based tests. To run the in-browser tests, clone the oss.sheetjs.com repo and replace the xlsx.js file (then fire up the browser and go to stress.html):

$ cp xlsx.js ../SheetJS.github.io
$ cd ../SheetJS.github.io
$ simplehttpserver # or "python -mSimpleHTTPServer" or "serve"
$ open -a Chromium.app http://localhost:8000/stress.html


Due to the precarious nature of the Open Specifications Promise, it is very important to ensure code is cleanroom. Consult CONTRIBUTING.md

XLS Support

XLS is available in js-xls.


Please consult the attached LICENSE file for details. All rights not explicitly granted by the Apache 2.0 license are reserved by the Original Author.

It is the opinion of the Original Author that this code conforms to the terms of the Microsoft Open Specifications Promise, falling under the same terms as OpenOffice (which is governed by the Apache License v2). Given the vagaries of the promise, the Original Author makes no legal claim that in fact end users are protected from future actions. It is highly recommended that, for commercial uses, you consult a lawyer before proceeding.


ISO/IEC 29500:2012(E) "Information technology — Document description and processing languages — Office Open XML File Formats"

OSP-covered specifications:

  • [MS-XLSX]: Excel (.xlsx) Extensions to the Office Open XML SpreadsheetML File Format
  • [MS-XLSB]: Excel (.xlsb) Binary File Format
  • [MS-XLDM]: Spreadsheet Data Model File Format
  • [MS-OE376]: Office Implementation Information for ECMA-376 Standards Support


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