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Frameworks and Bundlers

Each standalone release package is available at The NodeJS package is designed to be used with frameworks and bundlers. It is a proper ECMAScript Module release which can be optimized with developer tools. is the URL for version 0.20.2


Tarballs can be directly installed using a package manager:

yarn remove xlsx
yarn add

Once installed, the library can be imported under the name xlsx:

import { read, writeFileXLSX } from "xlsx";

The "Bundlers" demo includes complete examples.

Watch the repo or subscribe to the RSS feed to be notified when new versions are released!

Snyk Bugs

Snyk security tooling may report errors involving "Prototype Pollution":

Prototype Pollution [Medium Severity][]

As noted in the Snyk report:

The issue is resolved in version 0.19.3

Snyk is falsely reporting vulnerabilities. It is a bug in the Snyk tooling.

Until Snyk fixes the bugs, the official recommendation is to suppress the warning.

Legacy Endpoints

Older releases are technically available on the public npm registry as xlsx, but the registry is out of date. The latest version on that registry is 0.18.5

This is a known registry bug

The SheetJS CDN is the authoritative source for SheetJS modules.

For existing projects, the easiest approach is to uninstall and reinstall:

yarn remove xlsx
yarn add

When the xlsx library is a dependency of a dependency, the overrides field in package.json can control module resolution:

"overrides": {
"xlsx": ""


For general stability, making a local copy of SheetJS modules ("vendoring") is strongly recommended. Vendoring decouples projects from SheetJS infrastructure.

  1. Remove any existing dependency on a project named xlsx:
yarn remove xlsx
  1. Download the tarball (xlsx-0.20.2.tgz) for the desired version. The current version is available at

  1. Create a vendor subfolder at the root of your project and move the tarball to that folder. Add it to your project repository.

  2. Install the tarball using a package manager:

yarn add file:vendor/xlsx-0.20.2.tgz

The package will be installed and accessible as xlsx.


With most frameworks and bundler tools, named imports are recommended:

import { read, utils } from 'xlsx';

Some legacy bundlers require the glob import:

import * as XLSX from 'xlsx';
const { read, utils } = XLSX;

For legacy bundlers that support CommonJS, require will work:

var XLSX = require("xlsx");
var read =, utils = XLSX.utils;

The "Bundlers" demo includes complete examples.

Dynamic Imports

Dynamic imports with import() will only download scripts when they are needed.

Dynamic import will always download the full contents of the imported scripts!

This is a design flaw in ECMAScript modules

It is strongly recommended to use a wrapper script that imports and re-exports the parts of the SheetJS library that are used in a specific function or page:

SheetJSWriteWrapper.js (wrapper script)
/* This wrapper pulls `writeFileXLSX` and `utils` from the SheetJS library */
import { utils, writeFileXLSX } from "xlsx";
export { utils, writeFileXLSX };

A dynamic import of the wrapper script will only load the requested features:

async function export_data() {
/* dynamically import the SheetJS Wrapper */
const XLSX = await import ("./SheetJSWriteWrapper");
const wb = XLSX.utils.book_new();
const ws = XLSX.utils.aoa_to_sheet([["a","b","c"],[1,2,3]]);
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
XLSX.writeFileXLSX(wb, "SheetJSDynamicWrapperTest.xlsx");

Encoding support

If Encoding support is required, cpexcel.full.mjs must be manually imported:

/* load the codepage support library for extended support with older formats  */
import { set_cptable } from "xlsx";
import * as cptable from 'xlsx/dist/cpexcel.full.mjs';