---
title: Bundling Sheets with ParcelJS
sidebar_label: ParcelJS
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---
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[ParcelJS](https://parceljs.org/) is a module bundler.
[SheetJS](https://sheetjs.com) is a JavaScript library for reading and writing
data from spreadsheets.
This demo uses ParcelJS and SheetJS to export data. We'll explore how to bundle
SheetJS in a site using ParcelJS and how to export data to spreadsheets.
:::note pass
This demo focuses on integration details with the ParcelJS bundler.
The demos follow the ["Export Tutorial"](/docs/getting-started/examples/export),
which covers SheetJS library usage in more detail.
:::
:::note Tested Deployments
This demo was tested in the following environments:
| Version | Date |
|:---------|:-----------|
| `2.10.3` | 2023-12-04 |
| `1.12.3` | 2023-12-04 |
:::
## Integration Details
[The "Frameworks" section](/docs/getting-started/installation/frameworks) covers
installation with Yarn and other package managers.
After installing the SheetJS module in a RollupJS project, `import` statements
can load relevant parts of the library:
```js
import { read, utils, writeFileXLSX } from 'xlsx';
```
:::warning Parcel Bug
Errors of the form `Could not statically evaluate fs call` stem from a Parcel
bug[^1]. Upgrade to Parcel version 1.5.0 or later.
:::
## Complete Example
This demo follows the [Export Example](/docs/getting-started/examples/export).
0) Initialize a new project:
```bash
mkdir sheetjs-parceljs
cd sheetjs-parceljs
npm init -y
```
1) Save the following to `index.html`:
```html title="index.html"
SheetJS export demo
```
:::caution pass
**ParcelJS v1 did not support `import` statements within inline scripts.**
For ParcelJS version 1, the entire script should be copied to `index.js` and the
main `index.html` page should load the `index.js` script:
ParcelJS v1 example (click to show)
```html title="index.html"
SheetJS export demo
```
```js title="index.js"
// ESM-style import from "xlsx"
import { utils, version, writeFileXLSX } from 'xlsx';
document.getElementById("vers").innerText = version;
document.getElementById("xport").onclick = async() => {
/* fetch JSON data and parse */
const url = "https://sheetjs.com/data/executive.json";
const raw_data = await (await fetch(url)).json();
/* filter for the Presidents */
const prez = raw_data.filter(row => row.terms.some(term => term.type === "prez"));
/* sort by first presidential term */
prez.forEach(row => row.start = row.terms.find(term => term.type === "prez").start);
prez.sort((l,r) => l.start.localeCompare(r.start));
/* flatten objects */
const rows = prez.map(row => ({
name: row.name.first + " " + row.name.last,
birthday: row.bio.birthday
}));
/* generate worksheet and workbook */
const worksheet = utils.json_to_sheet(rows);
const workbook = utils.book_new();
utils.book_append_sheet(workbook, worksheet, "Dates");
/* fix headers */
utils.sheet_add_aoa(worksheet, [["Name", "Birthday"]], { origin: "A1" });
/* calculate column width */
const max_width = rows.reduce((w, r) => Math.max(w, r.name.length), 10);
worksheet["!cols"] = [ { wch: max_width } ];
/* create an XLSX file and try to save to Presidents.xlsx */
writeFileXLSX(workbook, "Presidents.xlsx");
};
```
:::
2) Install the SheetJS NodeJS module:
{`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
{`\
pnpm install --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
{`\
yarn add https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
#### Development
3) Run the ParcelJS development server:
```bash
npx -y parcel@2.10.3 index.html
```
The process will print a URL:
```
Server running at http://localhost:1234
```
4) Access the URL from the previous step (typically `http://localhost:1234`) in
a web browser and click the "Click to Export!" button to generate a file.
#### Production
5) Edit `package.json` and remove the following line:
```js title="package.json (search for this line and remove)"
"main": "index.js"
```
6) Build the production site:
```bash
npx -y parcel@2.10.0 build index.html
```
The production site will be stored in the `dist` folder
7) Start a local web server and serve the `dist` folder:
```bash
npx http-server dist
```
Access the displayed URL (typically `http://localhost:8080/`) in a web browser.
Click on "Click here to export" to generate a file.
[^1]: See [Issue 523 in the Parcel issue tracker](https://github.com/parcel-bundler/parcel/pull/523#issuecomment-357486164)