docs.sheetjs.com/docz/docs/02-getting-started/01-installation/03-nodejs.md

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---
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title: NodeJS
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pagination_prev: getting-started/index
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pagination_next: getting-started/examples/index
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sidebar_position: 3
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sidebar_custom_props:
summary: Server-side and other frameworks using NodeJS modules
---
import current from '/version.js';
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import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';
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import CodeBlock from '@theme/CodeBlock';
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Package tarballs are available on https://cdn.sheetjs.com.
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<p><a href={"https://cdn.sheetjs.com/xlsx-" + current + "/xlsx-" + current + ".tgz"}>{"https://cdn.sheetjs.com/xlsx-" + current + "/xlsx-" + current + ".tgz"}</a> is the URL for version {current}</p>
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## Installation
Tarballs can be directly installed using a package manager:
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<Tabs groupId="pm">
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<TabItem value="npm" label="npm">
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<CodeBlock language="bash">{`\
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npm rm --save xlsx
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npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
<TabItem value="pnpm" label="pnpm">
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<CodeBlock language="bash">{`\
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pnpm rm xlsx
pnpm install --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
<TabItem value="yarn" label="Yarn" default>
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<CodeBlock language="bash">{`\
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yarn remove xlsx
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yarn add https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
</Tabs>
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:::tip pass
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[Watch the repo](https://git.sheetjs.com/SheetJS/sheetjs) or subscribe to the
[RSS feed](https://git.sheetjs.com/sheetjs/sheetjs/tags.rss) to be notified when
new versions are released!
:::
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:::caution Snyk Bugs
Snyk security tooling may report errors involving "Prototype Pollution":
```
Prototype Pollution [Medium Severity][https://security.snyk.io/vuln/SNYK-JS-XLSX-5457926]
```
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As noted in the [Snyk report](https://web.archive.org/web/20231129100639/https://security.snyk.io/vuln/SNYK-JS-XLSX-5457926):
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> 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](https://snyk.io/blog/ignoring-vulnerabilities-with-snyk/).
:::
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### Legacy Endpoints
:::danger pass
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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** https://cdn.sheetjs.com/ **is the authoritative source**
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**for SheetJS modules.**
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For existing projects, the easiest approach is to uninstall and reinstall:
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<Tabs groupId="pm">
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<TabItem value="npm" label="npm">
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<CodeBlock language="bash">{`\
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npm rm --save xlsx
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npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
<TabItem value="pnpm" label="pnpm">
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<CodeBlock language="bash">{`\
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pnpm rm xlsx
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pnpm install --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
<TabItem value="yarn" label="Yarn" default>
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<CodeBlock language="bash">{`\
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yarn remove xlsx
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yarn add https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
</Tabs>
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When the `xlsx` library is a dependency of a dependency, the `overrides` field
in `package.json` can control module resolution:
<CodeBlock language="json" title="package.json">{`\
{
// highlight-start
"overrides": {
"xlsx": "https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz"
}
// highlight-end
}`}
</CodeBlock>
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:::
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### Vendoring
For general stability, making a local copy of SheetJS modules ("vendoring") is
strongly recommended. Vendoring decouples projects from SheetJS infrastructure.
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0) Remove any existing dependency on a project named `xlsx`:
<Tabs groupId="pm">
<TabItem value="npm" label="npm">
<CodeBlock language="bash">{`\
npm rm --save xlsx`}
</CodeBlock>
</TabItem>
<TabItem value="pnpm" label="pnpm">
<CodeBlock language="bash">{`\
pnpm rm xlsx`}
</CodeBlock>
</TabItem>
<TabItem value="yarn" label="Yarn" default>
<CodeBlock language="bash">{`\
yarn remove xlsx`}
</CodeBlock>
</TabItem>
</Tabs>
<ol start="1"><li><p>Download the tarball (<code parentName="pre">xlsx-{current}.tgz</code>) for the desired version. The current version is available at <a href={"https://cdn.sheetjs.com/xlsx-" + current + "/xlsx-" + current + ".tgz"}>{"https://cdn.sheetjs.com/xlsx-" + current + "/xlsx-" + current + ".tgz"}</a></p></li></ol>
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2) Create a `vendor` subfolder at the root of your project and move the tarball
to that folder. Add it to your project repository.
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3) Install the tarball using a package manager:
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<Tabs groupId="pm">
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<TabItem value="npm" label="npm">
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<CodeBlock language="bash">{`\
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npm i --save file:vendor/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
<TabItem value="pnpm" label="pnpm">
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<CodeBlock language="bash">{`\
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pnpm install --save file:vendor/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
<TabItem value="yarn" label="Yarn" default>
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<CodeBlock language="bash">{`\
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yarn add file:vendor/xlsx-${current}.tgz`}
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</CodeBlock>
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</TabItem>
</Tabs>
The package will be installed and accessible as `xlsx`.
## Usage
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The package supports CommonJS `require` and ESM `import` module systems.
:::info pass
**It is strongly recommended to use CommonJS in NodeJS.**
:::
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### CommonJS `require`
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By default, the module supports `require` and it will automatically add support
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for streams and file system access:
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```js
var XLSX = require("xlsx");
```
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### ESM `import`
The package also ships with `xlsx.mjs`, a script compatible with the ECMAScript
module system. When using the ESM build in NodeJS, some dependencies must be
loaded manually.
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#### Filesystem Operations
The `set_fs` method accepts a `fs` instance for reading and writing files using
`readFile` and `writeFile`:
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```js
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import * as XLSX from 'xlsx';
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/* load 'fs' for readFile and writeFile support */
import * as fs from 'fs';
XLSX.set_fs(fs);
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```
#### Stream Operations
The `set_readable` method accepts a `stream.Readable` instance for use in stream
methods such as `XLSX.stream.to_csv`:
```js
import * as XLSX from 'xlsx';
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/* load 'stream' for stream support */
import { Readable } from 'stream';
XLSX.stream.set_readable(Readable);
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```
#### Encoding Support
The `set_cptable` method accepts an instance of the SheetJS codepage library for
use in legacy file format processing. The `cpexcel.full.mjs` script must be
manually loaded. `xlsx/dist/cpexcel.full.mjs` can be imported:
```js
import * as XLSX from 'xlsx';
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/* load the codepage support library for extended support with older formats */
import * as cpexcel from 'xlsx/dist/cpexcel.full.mjs';
XLSX.set_cptable(cpexcel);
```
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#### NextJS
:::danger pass
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`fs` cannot be imported from the top level in NextJS pages. This will not work:
```js
/* it is safe to import the library from the top level */
import { readFile, utils, set_fs } from 'xlsx';
/* it is not safe to import 'fs' from the top level ! */
// highlight-next-line
import * as fs from 'fs'; // this import will fail
set_fs(fs);
```
:::
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For server-side file processing, `fs` should be loaded with a dynamic import
within a lifecycle function:
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```js title="index.js"
/* it is safe to import the library from the top level */
import { readFile, utils, set_fs } from 'xlsx';
import { join } from 'path';
import { cwd } from 'process';
export async function getServerSideProps() {
// highlight-next-line
set_fs(await import("fs")); // dynamically import 'fs' in `getServerSideProps`
const wb = readFile(join(cwd(), "public", "sheetjs.xlsx"));
// ...
}
```
The [NextJS demo](/docs/demos/static/nextjs) includes complete examples.