docs.sheetjs.com/docz/docs/03-demos/04-static/02-gatsbyjs.md

---
title: Spreadsheets in GatsbyJS Sites
sidebar_label: GatsbyJS
description: Make static websites from spreadsheets using GatsbyJS. Seamlessly integrate data into your website using SheetJS. Generate websites from data in Excel spreadsheets.
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import current from '/version.js';
import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';
import CodeBlock from '@theme/CodeBlock';

GatsbyJS is a framework for creating websites. It uses React components for page
templates and GraphQL for loading data.

[SheetJS](https://sheetjs.com) is a JavaScript library for reading and writing
data from spreadsheets.

This demo uses GatsbyJS and SheetJS (through the `gatsby-transformer-excel`[^1]
transformer) to pull data from a spreadsheet and display the content in a page.

The ["Complete Example"](#complete-example) section includes a complete website
powered by an XLSX spreadsheet.

:::info pass

`gatsby-transformer-excel` is maintained by the Gatsby core team and all bugs
should be directed to the main Gatsby project.  If it is determined to be a bug
in the parsing logic, issues should then be raised with the SheetJS team.

:::

:::caution pass

`gatsby-transformer-excel` uses an older version of the library.  It can be
overridden through a `package.json` override in the latest versions of NodeJS:

<CodeBlock language="json" title="package.json (add highlighted lines)">{`\
{
  "overrides": {
    "xlsx": "https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz"
  }
}`}
</CodeBlock>

:::

:::warning Telemetry

GatsbyJS collects telemetry by default. The `telemetry` subcommand can disable it:

```js
npx gatsby telemetry --disable
```

:::

## Integration Details

```mermaid
flowchart LR
  file[(workbook\nfile)]
  subgraph SheetJS operations
    filenode[File\nNode]
    datanode[Data\nNodes]
  end
  aoo(array of\nobjects)
  html{{HTML\nTABLE}}
  file --> |Source\nPlugin| filenode
  filenode --> |Transformer\nPlugin| datanode
  datanode --> |GraphQL\nQuery| aoo
  aoo --> |React\nJSX| html
```

In the GatsbyJS data system, source plugins read from data sources and generate
nodes represent raw data. Transformer plugins transform these nodes into other
nodes that represent processed data for use in pages.

This example uses `gatsby-source-filesystem`[^2] to read files from the
filesystem and `gatsby-transformer-excel` transformer to perform the transform.

### Installation

The [SheetJS NodeJS module](/docs/getting-started/installation/nodejs) will be
referenced by `gatsby-transformer-excel`.

Before installing, to ensure that the transformer uses the latest version of the
library, the `overrides` section must be added to `package.json`:

<CodeBlock language="json" title="package.json (add highlighted lines)">{`\
{
  // highlight-start
  "overrides": {
    "xlsx": "https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz"
  }
  // highlight-end
}`}
</CodeBlock>

`gatsby-transformer-excel` and `gatsby-source-filesystem` should be installed
after installing SheetJS modules:

<Tabs groupId="pm">
  <TabItem value="npm" label="npm">
<CodeBlock language="bash">{`\
npx gatsby telemetry --disable
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz
npm i --save gatsby-transformer-excel gatsby-source-filesystem`}
</CodeBlock>
  </TabItem>
  <TabItem value="pnpm" label="pnpm">
<CodeBlock language="bash">{`\
npx gatsby telemetry --disable
pnpm install https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz
pnpm install gatsby-transformer-excel gatsby-source-filesystem`}
</CodeBlock>
  </TabItem>
  <TabItem value="yarn" label="Yarn" default>
<CodeBlock language="bash">{`\
npx gatsby telemetry --disable
yarn add https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz
yarn add gatsby-transformer-excel gatsby-source-filesystem`}
</CodeBlock>
  </TabItem>
</Tabs>

### GraphQL details

Under the hood, `gatsby-transformer-excel` uses the SheetJS `read`[^3] method to
parse the workbook into a SheetJS workbook[^4]. Each worksheet is extracted from
the workbook. The `sheet_to_json` method[^5] generates row objects using the
headers in the first row as keys.

Consider the following worksheet:

![pres.xlsx](pathname:///pres.png)

Assuming the file name is `pres.xlsx` and the data is stored in "Sheet1", the
following nodes will be created:

```js
[
  { Name: "Bill Clinton", Index: 42, type: "PresXlsxSheet1" },
  { Name: "GeorgeW Bush", Index: 43, type: "PresXlsxSheet1" },
  { Name: "Barack Obama", Index: 44, type: "PresXlsxSheet1" },
  { Name: "Donald Trump", Index: 45, type: "PresXlsxSheet1" },
  { Name: "Joseph Biden", Index: 46, type: "PresXlsxSheet1" },
]
```

The type is a proper casing of the file name concatenated with the sheet name.

The following query pulls the `Name` and `Index` fields from each row:

```graphql
{
  allPresXlsxSheet1 { # "all" followed by type
    edges {
      node { # each line in this block should be a field in the data
        Name
        Index
      }
    }
  }
}
```

## Complete Example

:::note

This demo was tested on 2023 October 08 against `create-gatsby@3.12.0`. The
generated project used `gatsby@5.12.5` and `react@18.2.0`.

:::

### Project setup

0) Disable GatsbyJS telemetry:

```bash
npx gatsby telemetry --disable
```

1) Create a template site:

```bash
npm init gatsby -- -y sheetjs-gatsby
```

2) Follow the on-screen instructions for starting the local development server:

```bash
cd sheetjs-gatsby
npm run develop
```

Open a web browser to the displayed URL (typically `http://localhost:8000/`)

3) Edit `package.json` and add the highlighted lines in the JSON object:

<CodeBlock language="json">{`\
{
  // highlight-start
  "overrides": {
    "xlsx": "https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz"
  },
  // highlight-end
  "name": "sheetjs-gatsby",
  "version": "1.0.0",
`}
</CodeBlock>

4) Install the library and plugins:

<CodeBlock language="bash">{`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz
npm i --save gatsby-transformer-excel gatsby-source-filesystem
`}
</CodeBlock>

5) Make a `src/data` directory, download <https://sheetjs.com/pres.xlsx>, and
move the downloaded file into the new folder:

```bash
mkdir -p src/data
curl -L -o src/data/pres.xlsx https://sheetjs.com/pres.xlsx
```

6) Edit `gatsby-config.js` and add the following lines to the `plugins` array:

```js title="gatsby-config.js"
module.exports = {
  siteMetadata: {
    title: `sheetjs-gatsby`,
    siteUrl: `https://www.yourdomain.tld`,
  },
// highlight-start
  plugins: [
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `data`,
        path: `${__dirname}/src/data/`,
      },
    },
    `gatsby-transformer-excel`,
  ],
// highlight-end
}
```

Stop and restart the development server process (`npm run develop`).

### GraphiQL test

7) Open the GraphiQL editor at `http://localhost:8000/___graphql`

There is an editor in the left pane.  Paste the following query into the editor:

```graphql
{
  allPresXlsxSheet1 {
    edges {
      node {
        Name
        Index
      }
    }
  }
}
```

Press the Execute Query button and data should show up in the right pane:

![GraphiQL Screenshot](pathname:///gatsby/graphiql.png)

### React page

8) Create a new file `src/pages/pres.js` that uses the query and displays the result:

```jsx title="src/pages/pres.js"
import { graphql } from "gatsby"
import * as React from "react"

export const query = graphql`query {
  allPresXlsxSheet1 {
    edges {
      node {
        Name
        Index
      }
    }
  }
}`;

const PageComponent = ({data}) => {
  return ( <pre>{JSON.stringify(data, 2, 2)}</pre> );
};
export default PageComponent;
```

After saving the file, access `http://localhost:8000/pres` in the browser. The
displayed JSON is the data that the component receives:

```js
{
  "allPresXlsxSheet1": {
    "edges": [
      {
        "node": {
          "Name": "Bill Clinton",
          "Index": 42
        }
      },
  // ....
```

9) Change `PageComponent` to display a table based on the data:

```jsx title="src/pages/pres.js"
import { graphql } from "gatsby"
import * as React from "react"

export const query = graphql`query {
  allPresXlsxSheet1 {
    edges {
      node {
        Name
        Index
      }
    }
  }
}`;

// highlight-start
const PageComponent = ({data}) => {
  const rows = data.allPresXlsxSheet1.edges.map(r => r.node);
  return ( <table>
    <thead><tr><th>Name</th><th>Index</th></tr></thead>
    <tbody>{rows.map(row => ( <tr>
      <td>{row.Name}</td>
      <td>{row.Index}</td>
    </tr> ))}</tbody>
  </table> );
};
// highlight-end

export default PageComponent;
```

Going back to the browser, `http://localhost:8000/pres` will show a table:

![Data in Table](pathname:///gatsby/table1.png)

### Live refresh

10) Open the file `src/data/pres.xlsx` in Excel or LibreOffice or Numbers.
Add a new row at the end of the file:

![New Row in File](pathname:///gatsby/pres2.png)

Save the file and notice that the table has refreshed with the new data:

![Updated Table](pathname:///gatsby/table2.png)

### Static site

11) Stop the development server and run `npm run build`. Once the build is
finished, the output will confirm that the `/pres` route is static:

```
Pages

┌ src/pages/404.js
│ ├   /404/
│ └   /404.html
├ src/pages/index.js
│ └   /
└ src/pages/pres.js
  └   /pres/

  ╭────────────────────────────────────────────────────────────────╮
  │                                                                │
  │   (SSG) Generated at build time                                │
  │ D (DSG) Deferred static generation - page generated at runtime │
  │ ∞ (SSR) Server-side renders at runtime (uses getServerData)    │
  │ λ (Function) Gatsby function                                   │
  │                                                                │
  ╰────────────────────────────────────────────────────────────────╯
```

The generated page will be placed in `public/pres/index.html`.

12) Open `public/pres/index.html` with a text editor and search for "SheetJS".
There will be a HTML row:

```html title="public/pres/index.html"
<tr><td>SheetJS Dev</td><td>47</td></tr>
```

[^1]: The package is available as [`gatsby-transformer-excel` on the public NPM registry](https://www.npmjs.com/package/gatsby-transformer-excel). It is also listed on the [GatsbyJS plugin library](https://www.gatsbyjs.com/plugins/gatsby-transformer-excel/).
[^2]: See [the `gatsby-source-filesystem` plugin](https://www.gatsbyjs.com/plugins/gatsby-source-filesystem/) in the GatsbyJS documentation
[^3]: See [`read` in "Reading Files"](/docs/api/parse-options)
[^4]: See ["Workbook Object"](/docs/csf/book) for more details on the SheetJS workbook object.
[^5]: See [`sheet_to_json` in "Utilities"](/docs/api/utilities/array#array-output)