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---
title: HTTP Uploads
pagination_prev: demos/net/network/index
pagination_next: demos/net/server/index
---
<head>
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<script src="https://unpkg.com/axios@1.6.5/dist/axios.min.js"></script>
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<script src="https://unpkg.com/superagent@8.1.2/dist/superagent.min.js"></script>
</head>
import current from '/version.js';
import CodeBlock from '@theme/CodeBlock';
Browsers and other platforms offer solutions for uploading files to servers and
cloud storage solutions. Spreadsheets can be written using SheetJS and uploaded.
This demo explores file uploads using a number of browser APIs and wrapper
libraries. The upload process will generate a sample XLSX workbook, upload the
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file to [a test server](https://s2c.sheetjs.com), and display the response.
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:::info pass
This demo focuses on uploading files. Other demos cover other HTTP use cases:
- ["HTTP Downloads"](/docs/demos/net/network) covers downloading files
- ["HTTP Server Processing"](/docs/demos/net/server) covers HTTP servers
:::
:::caution Third-Party Hosts and Binary Data
Third-party cloud platforms such as AWS may corrupt raw binary uploads by
encoding requests and responses in UTF-8 strings.
For AWS, in the "Binary Media Types" section of the API Gateway console, the
`"multipart/form-data"` type should be added to ensure that AWS Lambda functions
can receive uploads from clients.
:::
## Uploading Binary Data
The SheetJS `write` method[^1] generates file data stored in `ArrayBuffer`
objects. The `ArrayBuffer` can be added to a `FormData` object. The `FormData`
object can be passed along to POST requests.
```mermaid
flowchart LR
subgraph SheetJS operations
wb(((SheetJS\nWorkbook)))
ab(XLSX Data\nArrayBuffer)
end
file(File\nobject)
form(FormData\nobject)
server[[Server\nrecipient]]
wb --> |`write`\n\n| ab
ab --> |new\n\n| file
file --> |new\nappend\n| form
form --> |POST\nrequest| server
```
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### Generating Files
In a typical scenario, a process generates arrays of simple objects.
The SheetJS `json_to_sheet` method[^2] generates a SheetJS worksheet object[^3].
The `book_new` method[^4] creates a workbook object that includes the worksheet.
The `write` method[^5] generates the file in memory.
The following snippet creates a sample dataset and generates an `ArrayBuffer`
object representing the workbook bytes:
```js title="Generating an XLSX file in memory"
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/* create sample SheetJS workbook object */
var aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
var ws = XLSX.utils.aoa_to_sheet(aoa);
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var wb = XLSX.utils.book_new(ws, "Sheet1");
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XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* export SheetJS workbook object to XLSX file bytes */
var data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
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```
### Creating Form Data
`File` objects represent files. The `File` constructor accepts an array of data
fragments and a filename.
Browser APIs typically represent form body data using `FormData` objects. The
`append` method adds fields to the `FormData` object. Adding `File` objects
effectively "attaches" a file in the upload.
The following snippet constructs a new `FormData` object. The `file` field in
the form will be set to the data from the previous snippet:
```js title="Creating Form Data and attaching the generated file"
/* create File */
var file = new File([data], 'sheetjs.xlsx')
// generated XLSX ^^^^ ^^^^^^^^^^^^ file name
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/* build FormData with the generated file */
var fdata = new FormData();
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fdata.append('file', file);
// ^^^^ field name in the form body
```
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### POST Request
This demo explores a number of APIs and libraries for making POST requests. Each
approach will upload data stored in `FormData` objects.
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This snippet uses `XMLHttpRequest` to upload data to https://s2c.sheetjs.com:
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```js title="Uploading Form Data with XMLHttpRequest"
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/* send data using XMLHttpRequest */
var req = new XMLHttpRequest();
req.open("POST", "https://s2c.sheetjs.com", true);
req.send(fdata);
```
## Browser Demos
When the upload button is clicked, the browser will build up a new workbook,
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generate a XLSX file, upload it to https://s2c.sheetjs.com and show the
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response. If the process was successful, a HTML table will be displayed
:::note Tested Deployments
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Each browser demo was tested in the following environments:
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Konqueror 22
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| Browser | Date |
|:-------------|:-----------|
| Chromium 133 | 2025-03-30 |
| Safari 18.3 | 2025-03-30 |
| Konqueror 22 | 2025-04-23 |
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:::
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#### Test Server
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The https://s2c.sheetjs.com service is currently hosted on Deno Deploy. The
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["Deno Deploy" demo](/docs/demos/cloud/deno#demo) covers the exact steps for
deploying the service.
The CORS-enabled service handles POST requests by looking for uploaded files in
the `"file"` key. If a file is found, the file will be parsed using the SheetJS
`read` method[^6] and the first worksheet will be converted to HTML using the
`sheet_to_html` method[^7].
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### XMLHttpRequest
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Using the `XMLHttpRequest` API, the `send` method can accept `FormData` objects:
```js title="Uploading Form Data with XMLHttpRequest"
/* send data using XMLHttpRequest */
var req = new XMLHttpRequest();
req.open("POST", "https://s2c.sheetjs.com", true);
req.send(fdata);
```
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<details>
<summary><b>Complete Code Snippet</b> (click to show)</summary>
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```js title="SheetJS + XMLHttpRequest example"
/* create sample SheetJS workbook object */
var aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* export SheetJS workbook object to XLSX file bytes */
var data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
/* build FormData with the generated file */
var fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
// field name ^^^^ file name ^^^^^^^^^^^^
/* send data using XMLHttpRequest */
var req = new XMLHttpRequest();
req.open("POST", "https://s2c.sheetjs.com", true);
req.send(fdata);
```
</details>
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<details>
<summary><b>Live demo</b> (click to show)</summary>
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This demo starts from an array of arrays of data. When the button is clicked, a
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workbook file will be generated and uploaded to https://s2c.sheetjs.com. The
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service will return a HTML table.
```jsx live
function SheetJSXHRUL() {
const [__html, setHTML] = React.useState("");
const [sz, setSz] = React.useState(0);
const [csv, setCSV] = React.useState("");
/* raw data */
const aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
/* target URL */
const url = "https://s2c.sheetjs.com";
/* Fetch and update HTML */
const xport = React.useCallback(async() => { try {
/* Make SheetJS Workbook from data */
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* Export to XLSX */
const data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
setSz(data.length || data.byteLength);
/* Make FormData */
const fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
/* Upload */
/* - create XMLHttpRequest */
const req = new XMLHttpRequest();
req.open("POST", url, true);
/* - on success, display the contents */
req.onload = (e) => setHTML(req.responseText);
/* - on error, display "Request failed" */
req.onerror = (e) => setHTML("Request failed");
/* - send data */
req.send(fdata);
} catch(e) { setHTML(e && e.message || e); } });
/* Display data in CSV form */
React.useEffect(() => {
const ws = XLSX.utils.aoa_to_sheet(aoa);
setCSV(XLSX.utils.sheet_to_csv(ws));
}, []);
return ( <pre><b>CSV Data</b><div>{csv}</div>
{sz ? ( <>
<b>Generated file size: {sz} bytes</b>
<div dangerouslySetInnerHTML={{ __html }}/>
</> ) : (<button onClick={xport}><b>Export and Upload!</b></button>)}
</pre> );
}
```
</details>
### fetch
`fetch` takes a second parameter which allows for setting POST request body:
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```js title="Uploading Form Data with fetch"
/* send data using fetch */
fetch("https://s2c.sheetjs.com", { method: "POST", body: fdata });
```
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<details>
<summary><b>Complete Code Snippet</b> (click to show)</summary>
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```js title="SheetJS + fetch example"
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/* create sample SheetJS workbook object */
var aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* export SheetJS workbook object to XLSX file bytes */
var data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
/* build FormData with the generated file */
var fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
// field name ^^^^ file name ^^^^^^^^^^^^
/* send data using fetch */
fetch("https://s2c.sheetjs.com", { method: "POST", body: fdata });
```
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</details>
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<details>
<summary><b>Live demo</b> (click to show)</summary>
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This demo uses `fetch` to upload data to https://s2c.sheetjs.com. It will parse
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the workbook and return an HTML table.
```jsx live
function SheetJSFetchUL() {
const [__html, setHTML] = React.useState("");
const [sz, setSz] = React.useState(0);
const [csv, setCSV] = React.useState("");
/* raw data */
const aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
/* target URL */
const url = "https://s2c.sheetjs.com";
/* Fetch and update HTML */
const xport = React.useCallback(async() => { try {
/* Make SheetJS Workbook from data */
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* Export to XLSX */
const data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
setSz(data.length || data.byteLength);
/* Make FormData */
const fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
/* Upload */
const res = await fetch(url, {method:"POST", body: fdata});
/* Show Server Response */
setHTML((await res.text()));
} catch(e) { setHTML(e && e.message || e); }});
/* Display data in CSV form */
React.useEffect(() => {
const ws = XLSX.utils.aoa_to_sheet(aoa);
setCSV(XLSX.utils.sheet_to_csv(ws));
}, []);
return (<pre><b>CSV Data</b><div>{csv}</div>
{sz ? ( <>
<b>Generated file size: {sz} bytes</b>
<div dangerouslySetInnerHTML={{ __html }}/>
</> ) : (<button onClick={xport}><b>Export and Upload!</b></button>)}
</pre>);
}
```
</details>
### Wrapper Libraries
Before `fetch` shipped with browsers, there were various wrapper libraries to
simplify `XMLHttpRequest`. Due to limitations with `fetch`, these libraries
are still relevant.
#### axios
[`axios`](https://axios-http.com/) presents a Promise based interface.
Uploading form data is nearly identical to the `fetch` example:
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```js title="Uploading Form Data with axios"
/* send data using axios */
axios("https://s2c.sheetjs.com", { method: "POST", body: fdata });
```
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<details>
<summary><b>Complete Code Snippet</b> (click to show)</summary>
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```js title="SheetJS + axios example"
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/* create sample SheetJS workbook object */
var aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* export SheetJS workbook object to XLSX file bytes */
var data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
/* build FormData with the generated file */
var fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
// field name ^^^^ file name ^^^^^^^^^^^^
/* send data using axios */
axios("https://s2c.sheetjs.com", { method: "POST", data: fdata });
```
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</details>
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<details>
<summary><b>Live demo</b> (click to show)</summary>
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This demo uses `axios` to upload data to https://s2c.sheetjs.com. It will parse
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the workbook and return an HTML table.
:::caution pass
If the live demo shows a message
```
ReferenceError: axios is not defined
```
please refresh the page. This is a known bug in the documentation generator.
:::
```jsx live
function SheetJSAxiosUL() {
const [__html, setHTML] = React.useState("");
const [sz, setSz] = React.useState(0);
const [csv, setCSV] = React.useState("");
/* raw data */
const aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
/* target URL */
const url = "https://s2c.sheetjs.com";
/* Fetch and update HTML */
const xport = React.useCallback(async() => { try {
/* Make SheetJS Workbook from data */
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* Export to XLSX */
const data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
setSz(data.length || data.byteLength);
/* Make FormData */
const fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
/* Upload */
const res = await axios(url, {method:"POST", data: fdata});
/* Show Server Response */
setHTML(res.data);
} catch(e) { setHTML(e && e.message || e); }});
/* Display data in CSV form */
React.useEffect(() => {
const ws = XLSX.utils.aoa_to_sheet(aoa);
setCSV(XLSX.utils.sheet_to_csv(ws));
}, []);
return (<pre><b>CSV Data</b><div>{csv}</div>
{sz ? ( <>
<b>Generated file size: {sz} bytes</b>
<div dangerouslySetInnerHTML={{ __html }}/>
</> ) : (<button onClick={xport}><b>Export and Upload!</b></button>)}
</pre>);
}
```
</details>
#### superagent
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[`superagent`](https://ladjs.github.io/superagent/) is a network request library
with a "Fluent Interface".
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The `send` method accepts a `FormData` object as the first argument:
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```js title="Uploading Form Data with superagent"
/* send data using superagent */
superagent.post("https://s2c.sheetjs.com").send(fd);
```
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<details>
<summary><b>Complete Code Snippet</b> (click to show)</summary>
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```js title="SheetJS + superagent example"
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/* create sample SheetJS workbook object */
var aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* export SheetJS workbook object to XLSX file bytes */
var data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
/* build FormData with the generated file */
var fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
// field name ^^^^ file name ^^^^^^^^^^^^
/* send data (fd is the FormData object) */
superagent.post("https://s2c.sheetjs.com").send(fd);
```
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</details>
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<details>
<summary><b>Live demo</b> (click to show)</summary>
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This demo uses `superagent` to upload data to https://s2c.sheetjs.com. It will
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parse the workbook and return an HTML table.
:::caution pass
If the live demo shows a message
```
ReferenceError: superagent is not defined
```
please refresh the page. This is a known bug in the documentation generator.
:::
```jsx live
function SheetJSSuperAgentUL() {
const [__html, setHTML] = React.useState("");
const [sz, setSz] = React.useState(0);
const [csv, setCSV] = React.useState("");
/* raw data */
const aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
/* target URL */
const url = "https://s2c.sheetjs.com";
/* Fetch and update HTML */
const xport = React.useCallback(async() => { try {
/* Make SheetJS Workbook from data */
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* Export to XLSX */
const data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
setSz(data.length || data.byteLength);
/* Make FormData */
const fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
/* Upload */
superagent.post(url).send(fdata).end((err, res) => {
/* Show Server Response */
setHTML(res.text);
});
} catch(e) { setHTML(e && e.message || e); }});
/* Display data in CSV form */
React.useEffect(() => {
const ws = XLSX.utils.aoa_to_sheet(aoa);
setCSV(XLSX.utils.sheet_to_csv(ws));
}, []);
return (<pre><b>CSV Data</b><div>{csv}</div>
{sz ? ( <>
<b>Generated file size: {sz} bytes</b>
<div dangerouslySetInnerHTML={{ __html }}/>
</> ) : (<button onClick={xport}><b>Export and Upload!</b></button>)}
</pre>);
}
```
</details>
## NodeJS Demos
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These examples show how to upload data in NodeJS scripts.
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### fetch
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NodeJS `fetch`, available in version 20, mirrors the [browser `fetch`](#fetch).
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:::note Tested Deployments
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This demo was tested in the following environments:
| NodeJS | Date |
|:-----------|:-----------|
demo refresh
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| `22.13.0` | 2025-01-08 |
| `20.18.1` | 2025-01-08 |
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:::
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<details>
<summary><b>Complete Example</b> (click to show)</summary>
upload
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mdx cleanup in preparation for v2 - use autolinks (e.g <https://sheetjs.com> -> https://sheetjs.com) - move <summary> blocks to separate lines
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This demo uses `fetch` to upload data to https://s2c.sheetjs.com. It will parse
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the workbook and return data in CSV rows.
1) Install the [SheetJS NodeJS module](/docs/getting-started/installation/nodejs):
<CodeBlock language="bash">{`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
</CodeBlock>
2) Save the following to `SheetJSFetch.js`:
```js title="SheetJSFetch.js"
const XLSX = require("xlsx");
/* create sample SheetJS workbook object */
var aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* export SheetJS workbook object to XLSX file bytes */
var data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
/* build FormData with the generated file */
var fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
// field name ^^^^ file name ^^^^^^^^^^^^
fdata.append('type', 'csv');
(async() => {
/* send data using fetch */
const res = await fetch("https://s2c.sheetjs.com", { method: "POST", body: fdata });
const txt = await res.text();
console.log(txt);
})();
```
3) Run the script:
```bash
node SheetJSFetch.js
```
It will print CSV contents of the test file.
</details>
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### request
The deprecated [`request`](https://github.com/request/request) library is useful
in legacy NodeJS deployments where `fetch` may not be available.
The SheetJS `write` method will generate NodeJS Buffer objects when the `type`
option is set to `"buffer"`:
```js
/* export SheetJS workbook object to XLSX file bytes */
const data = XLSX.write(wb, {bookType: 'xlsx', type: 'buffer'});
```
A `request` file object can be built using the Buffer. The file object must
include an `options` object that specifies the file name and content type:
```js
/* create a file object for the `request` form data */
const request_file = {
/* `value` can be a Buffer object */
value: data,
options: {
/* `options.filename` is the filename that the server will see */
filename: "sheetjs.xlsx",
/* `options.contentType` must be set */
contentType: "application/octet-stream"
}
};
```
The `request` and `request.post` methods accept an options argument. The
`formData` property specifies the body to be uploaded. Property names correspond
to the uploaded form names and values describe the uploaded content.
The `request` file object should be added to the `formData` object:
```js
request({
// ... other options ...
formData: {
// ... other form fields ...
/* the server will see the uploaded file in the `file` body property */
/* highlight-next-line */
file: request_file
}
}, function(err, res) { /* handle response ... */ });
```
:::note Tested Deployments
This demo was tested in the following environments:
| NodeJS | `request` | Date |
|:-----------|:----------|:-----------|
demo refresh
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| `22.13.0` | `2.88.2` | 2025-01-08 |
| `20.18.1` | `2.88.2` | 2025-01-08 |
| `18.20.5` | `2.88.2` | 2025-01-08 |
| `16.20.2` | `2.88.2` | 2025-01-08 |
| `14.21.3` | `2.88.2` | 2025-01-08 |
| `12.22.12` | `2.88.2` | 2025-01-08 |
| `10.24.1` | `2.88.2` | 2025-01-08 |
| `8.17.0` | `2.88.2` | 2025-01-08 |
| `6.17.1` | `2.88.2` | 2025-01-08 |
| `4.9.1` | `2.81.0` | 2025-01-08 |
| `0.12.18` | `2.81.0` | 2025-01-08 |
| `0.10.48` | `2.81.0` | 2025-01-08 |
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:::
mdx cleanup in preparation for v2 - use autolinks (e.g <https://sheetjs.com> -> https://sheetjs.com) - move <summary> blocks to separate lines
2024-04-08 04:47:04 +00:00
<details>
<summary><b>Complete Example</b> (click to show)</summary>
nativescript windows + android test
2024-04-08 03:55:10 +00:00
mdx cleanup in preparation for v2 - use autolinks (e.g <https://sheetjs.com> -> https://sheetjs.com) - move <summary> blocks to separate lines
2024-04-08 04:47:04 +00:00
This demo uses `request` to upload data to https://s2c.sheetjs.com. It will
nativescript windows + android test
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parse the workbook and return data in CSV rows.
1) Install the [SheetJS NodeJS module](/docs/getting-started/installation/nodejs)
and `request` module:
<CodeBlock language="bash">{`\
npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz request`}
</CodeBlock>
demo refresh
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:::note pass
The current version of `request` requires NodeJS 6 or later. For older versions
of NodeJS, `request` version `2.81.0` should be installed.
:::
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2) Save the following to `SheetJSRequest.js`:
```js title="SheetJSRequest.js"
const XLSX = require("xlsx");
const request = require("request");
/* create sample SheetJS workbook object */
var aoa = [
["S", "h", "e", "e", "t", "J", "S"],
[ 5, 4, 3, 3, 7, 9, 5]
];
const ws = XLSX.utils.aoa_to_sheet(aoa);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
/* export SheetJS workbook object to XLSX file bytes */
var data = XLSX.write(wb, {bookType: 'xlsx', type: 'buffer'});
request({
method: "POST",
url: "https://s2c.sheetjs.com",
headers: {
Accept: "text/html"
},
formData: {
type: "csv",
file: {
value: data,
options: {
filename: "sheetjs.xlsx",
contentType: "application/octet-stream"
}
}
}
}, function(err, res, body) {
if(err) return console.error(err);
console.log(body);
});
```
3) Run the script:
```bash
node SheetJSRequest.js
```
It will print CSV contents of the test file.
:::caution pass
For legacy versions of NodeJS, the process may fail with a certificate error:
```
{ [Error: certificate not trusted] code: 'CERT_UNTRUSTED' }
```
The environment variable `NODE_TLS_REJECT_UNAUTHORIZED` can be set to `0`:
```bash
env NODE_TLS_REJECT_UNAUTHORIZED="0" node SheetJSRequest.js
```
**It is strongly recommended to upgrade to a newer version of NodeJS!**
:::
</details>
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## Troubleshooting
Some SheetJS users have reported corrupted files. To diagnose the error, it is
strongly recommended to write local files.
For example, using `fetch` in the browser, the bytes can be downloaded using the
[HTML5 Download Attribute](/docs/demos/local/file#html5-download-attribute). The
highlighted lines should be added immediately after `write`:
```js title="Diagnosing issues in a fetch upload"
/* Generate XLSX file */
const data = XLSX.write(wb, {bookType: 'xlsx', type: 'array'});
// highlight-start
/* Write to Local File */
const blob = new Blob([data]);
const url = URL.createObjectURL(blob);
const a = document.createElement("a");
a.download = "SheetJS.xlsx";
a.href = url;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
// highlight-end
/* Make FormData */
const fdata = new FormData();
fdata.append('file', new File([data], 'sheetjs.xlsx'));
/* Upload */
const url = "https://s2c.sheetjs.com";
const res = await fetch(url, {method:"POST", body: fdata});
```
If the generated file is valid, then the issue is in the server infrastructure.
[^1]: See [`write` in "Writing Files"](/docs/api/write-options)
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[^2]: See [`json_to_sheet` in "Utilities"](/docs/api/utilities/array#array-of-objects-input)
[^3]: See ["Worksheet Object" in "SheetJS Data Model"](/docs/csf/sheet) for more details.
[^4]: See [`book_new` in "Utilities"](/docs/api/utilities/wb)
[^5]: See [`write` in "Writing Files"](/docs/api/write-options)
[^6]: See [`read` in "Reading Files"](/docs/api/parse-options)
[^7]: See [`sheet_to_html` in "Utilities"](/docs/api/utilities/html#html-table-output)
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