docs.sheetjs.com/docz/docs/03-demos/30-cloud/19-deno.md

---
title: Sheets with Deno Deploy
sidebar_label: Deno Deploy
pagination_prev: demos/local/index
pagination_next: demos/extensions/index
---

import current from '/version.js';
import CodeBlock from '@theme/CodeBlock';

[Deno Deploy](https://dash.deno.com/) offers distributed "Serverless Functions"
powered by Deno.

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

This demo covers integration details. We'll explore how to load and use SheetJS
scripts in Deno Deploy functions.

The ["Demo"](#demo) section builds a sample service that converts XLSX and other
types of spreadsheets to HTML tables and CSV rows.

:::caution pass

When the demo was last tested, Deno Deploy required a GitHub account.

:::

:::note Tested Deployments

This demo was last tested by SheetJS users on 2025-01-15.

:::

## Integration Details

The [SheetJS Deno module](/docs/getting-started/installation/deno) can be
imported from Deno Deploy server scripts.

### Supported Frameworks

:::danger pass

Deno Deploy does not offer any sort of temporary file access in functions.

This breaks web frameworks that use the filesystem in body parsing.

:::

When the demo was last tested, the `drash` server framework used an in-memory
approach for parsing POST request bodies.

The [Drash demo](/docs/demos/net/server/drash) covers the framework in detail.

### Parsing Data

When files are submitted via HTTP POST, the `bodyParam` method can fetch data.
The `content` property of the returned object can be parsed with `XLSX.read`.

The following example assumes the file is submitted at field name `file`:

<CodeBlock language="ts" title="Sample POST request handler to generate HTML">{`\
// @deno-types="https://cdn.sheetjs.com/xlsx-${current}/package/types/index.d.ts"
import { read, utils } from 'https://cdn.sheetjs.com/xlsx-${current}/package/xlsx.mjs';
import * as Drash from "https://cdn.jsdelivr.net/gh/drashland/drash@v2.8.1/mod.ts";
\n\
class SheetJSResource extends Drash.Resource {
  public paths = ["/"];
\n\
  public POST(request: Drash.Request, response: Drash.Response) {
    // highlight-start
    /* get data from body */
    const file = request.bodyParam<Drash.Types.BodyFile>("file");
    /* parse */
    var wb = read(file.content, {type: "buffer", dense: true});
    // highlight-end
    /* generate HTML from first worksheet */
    return response.html(utils.sheet_to_html(wb.Sheets[wb.SheetNames[0]]));
  }
}`}
</CodeBlock>

## Demo

0) Create a new GitHub account or sign into an existing account.

1) Open the [main Deno Deploy portal](https://dash.deno.com/) in a browser.

2) If the account never signed into Deno Deploy, click "Continue with Github".

In the next screen, review the prompt and click "Authorize Deno Deploy".

If a welcome screen is displayed, click "I know what I'm doing".

:::caution pass

If a Terms and Conditions prompt is displayed, review the Terms and Conditions
and the Privacy Policy before checking the box and clicking "Continue"

:::

3) Click "New Playground" to create a new Playground.

4) Download [`s2c.ts`](pathname:///deno/s2c.ts).

5) Open `s2c.ts` with a text editor and copy the contents of the source file
into the playground editor (left pane in the browser).

![Deno Deploy Editor](pathname:///deno/editor.png)

6) Click "Save and Deploy". When the demo was last tested, it was a blue button.

![Save and Deploy](pathname:///deno/save-deploy.png)

### Testing

7) Wait until the server is deployed. When it is deployed, the right panel will
show "SheetJS Spreadsheet Conversion Service":

> ![Screenshot](pathname:///deno/sshot.png)

8) Download the test file https://docs.sheetjs.com/pres.xlsx

9) In the browser window, click "Choose File" and select the downloaded file.

10) Click "Submit". The right panel will show the contents in a HTML TABLE.

11) Open a terminal window and download https://docs.sheetjs.com/pres.numbers:

```bash
curl -LO https://docs.sheetjs.com/pres.numbers
```

12) Copy the first `curl` line from the page and run in the terminal. For
example, if the deployment is `clean-badger-69`, the command would be

```bash
curl -X POST -F"file=@pres.numbers" https://clean-badger-69.deno.dev/
```

The output will be an HTML table

13) Copy the second `curl` line from the page and run in the terminal. For
example, if the deployment is `clean-badger-69`, the command would be

```bash
curl -X POST -F"file=@pres.numbers" -F"type=csv" https://clean-badger-69.deno.dev/
```

The output will be CSV.