docs.sheetjs.com/docz/docs/08-api/07-write-options.md

sidebar_position	hide_table_of_contents	title
7	true	Writing Files

import current from '/version.js';

Writing Options

import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem';

XLSX.write(wb, write_opts) attempts to write the workbook wb

XLSX.writeFile(wb, filename, write_opts) attempts to write wb to filename. In browser-based environments, it will attempt to force a client-side download.

XLSX.writeFileAsync(filename, wb, o, cb) attempts to write wb to filename. If o is omitted, the writer will use the third argument as the callback.

The write functions accept an options argument:

Option Name	Default	Description
type		Output data encoding (see Output Type below)
cellDates	false	Store dates as type d (default is n)
codepage		If specified, use code page when appropriate **
bookSST	false	Generate Shared String Table **
bookType	"xlsx"	Type of Workbook (see below for supported formats)
sheet	""	Name of Worksheet for single-sheet formats **
compression	false	Use ZIP compression for ZIP-based formats **
Props		Override workbook properties when writing **
themeXLSX		Override theme XML when writing XLSX/XLSB/XLSM **
ignoreEC	true	Suppress "number as text" errors **
numbers		Payload for NUMBERS export **

• bookSST is slower and more memory intensive, but has better compatibility with older versions of iOS Numbers
• The raw data is the only thing guaranteed to be saved. Features not described in this README may not be serialized.
• cellDates only applies to XLSX output and is not guaranteed to work with third-party readers. Excel itself does not usually write cells with type d so non-Excel tools may ignore the data or error in the presence of dates.
• codepage is applied to legacy formats including DBF. Characters missing from the encoding will be replaced with underscore characters (_).
• Props is an object mirroring the workbook Props field. See the table from the Workbook File Properties section.
• if specified, the string from themeXLSX will be saved as the primary theme for XLSX/XLSB/XLSM files (to xl/theme/theme1.xml in the ZIP)
• Due to a bug in the program, some features like "Text to Columns" will crash Excel on worksheets where error conditions are ignored. The writer will mark files to ignore the error by default. Set ignoreEC to false to suppress.

Exporting NUMBERS files (click to show)

The NUMBERS writer requires a fairly large base. The supplementary xlsx.zahl scripts provide support. xlsx.zahl.js is designed for standalone and NodeJS use, while xlsx.zahl.mjs is suitable for ESM.

Adding NUMBERS export support involves two steps:

1. Load the xlsx.zahl script

2. Pass the payload into the numbers option to write or writeFile.

https://cdn.sheetjs.com/xlsx-{current}/package/dist/xlsx.zahl.js is the URL for {current}

{`\
\n\
\n\
\n\
\n\
\n\
`}

After installing the package:

{`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}

The scripts will be available at xlsx/dist/xlsx.zahl (CommonJS) and xlsx/dist/xlsx.zahl.mjs (ESM).

var XLSX = require("xlsx");
var XLSX_ZAHL_PAYLOAD = require("xlsx/dist/xlsx.zahl");
var wb = XLSX.utils.book_new(); var ws = XLSX.utils.aoa_to_sheet([
  ["SheetJS", "<3","விரிதாள்"],
  [72,,"Arbeitsblätter"],
  [,62,"数据"],
  [true,false,],
]); XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
XLSX.writeFile(wb, "textport.numbers", {numbers: XLSX_ZAHL_PAYLOAD, compression: true});

After installing the package:

{`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}

The scripts will be available at xlsx/dist/xlsx.zahl (CommonJS) and xlsx/dist/xlsx.zahl.mjs (ESM).

import * as XLSX from "xlsx";
import XLSX_ZAHL_PAYLOAD from "xlsx/dist/xlsx.zahl";
import * as fs from "fs";
XLSX.set_fs(fs);
var wb = XLSX.utils.book_new(); var ws = XLSX.utils.aoa_to_sheet([
  ["SheetJS", "<3","விரிதாள்"],
  [72,,"Arbeitsblätter"],
  [,62,"数据"],
  [true,false,],
]); XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
XLSX.writeFile(wb, "textport.numbers", {numbers: XLSX_ZAHL_PAYLOAD, compression: true});

https://cdn.sheetjs.com/xlsx-{current}/package/dist/xlsx.zahl.mjs is the URL for {current}

{`\
import * as XLSX from 'https://cdn.sheetjs.com/xlsx-${current}/package/xlsx.mjs';\n\
import XLSX_ZAHL_PAYLOAD from 'https://cdn.sheetjs.com/xlsx-${current}/package/dist/xlsx.zahl.mjs';\n\

var wb = XLSX.utils.book_new(); var ws = XLSX.utils.aoa_to_sheet([\n\
  ["SheetJS", "<3","விரிதாள்"],\n\
  [72,,"Arbeitsblätter"],\n\
  [,62,"数据"],\n\
  [true,false,],\n\
]); XLSX.utils.book_append_sheet(wb, ws, "Sheet1");\n\
XLSX.writeFile(wb, "textport.numbers", {numbers: XLSX_ZAHL_PAYLOAD, compression: true});\n\
`}

Supported Output Formats

For broad compatibility with third-party tools, this library supports many output formats. The specific file type is controlled with bookType option:

bookType	file ext	container	sheets	Description
xlsx	.xlsx	ZIP	multi	Excel 2007+ XML Format
xlsm	.xlsm	ZIP	multi	Excel 2007+ Macro XML Format
xlsb	.xlsb	ZIP	multi	Excel 2007+ Binary Format
biff8	.xls	CFB	multi	Excel 97-2004 Workbook Format
biff5	.xls	CFB	multi	Excel 5.0/95 Workbook Format
biff4	.xls	none	single	Excel 4.0 Worksheet Format
biff3	.xls	none	single	Excel 3.0 Worksheet Format
biff2	.xls	none	single	Excel 2.0 Worksheet Format
xlml	.xls	none	multi	Excel 2003-2004 (SpreadsheetML)
numbers	.numbers	ZIP	single	Numbers 3.0+ Spreadsheet
ods	.ods	ZIP	multi	OpenDocument Spreadsheet
fods	.fods	none	multi	Flat OpenDocument Spreadsheet
wk3	.wk3	none	multi	Lotus Workbook (WK3)
csv	.csv	none	single	Comma Separated Values
txt	.txt	none	single	UTF-16 Unicode Text (TXT)
sylk	.sylk	none	single	Symbolic Link (SYLK)
html	.html	none	single	HTML Document
dif	.dif	none	single	Data Interchange Format (DIF)
dbf	.dbf	none	single	dBASE II + VFP Extensions (DBF)
wk1	.wk1	none	single	Lotus Worksheet (WK1)
rtf	.rtf	none	single	Rich Text Format (RTF)
prn	.prn	none	single	Lotus Formatted Text
eth	.eth	none	single	Ethercalc Record Format (ETH)

• compression only applies to formats with ZIP containers.
• Formats that only support a single sheet require a sheet option specifying the worksheet. If the string is empty, the first worksheet is used.
• writeFile will automatically guess the output file format based on the file extension if bookType is not specified. It will choose the first format in the aforementioned table that matches the extension.

Output Type

The type argument for write mirrors the type argument for read:

type	output
"base64"	string: Base64 encoding of the file
"binary"	string: binary string (byte n is data.charCodeAt(n))
"string"	string: JS string (not compatible with binary formats)
"buffer"	nodejs Buffer
"array"	ArrayBuffer, fallback array of 8-bit unsigned int
"file"	string: path of file that will be created (nodejs only)

• For compatibility with Excel, csv output will always include the UTF-8 byte order mark.