supabase/apps/temp-docs/docs/reference/javascript/storage-from-update.mdx

---
id: storage-from-update
title: "from.update()"
slug: storage-from-update
custom_edit_url: https://github.com/supabase/supabase/edit/master/web/spec/supabase.yml
---

import Tabs from '@theme/Tabs';
import TabsPanel from '@theme/TabsPanel';

Replaces an existing file at the specified path with a new one.

<Tabs
  defaultActiveId="js"
  groupId="reference/supabase-js"
  values={[{ label: 'JavaScript', value: 'js' }]}>

<TabsPanel id="js" label="js">

```js
const avatarFile = event.target.files[0]
const { data, error } = await supabase
  .storage
  .from('avatars')
  .update('public/avatar1.png', avatarFile, {
    cacheControl: '3600',
    upsert: false
  })
```


</TabsPanel>

</Tabs>

## Parameters


<ul className="method-list-group">
  
<li className="method-list-item">
  <h4 className="method-list-item-label">
    <span className="method-list-item-label-name">
      path
    </span>
    <span className="method-list-item-label-badge required">
      required
    </span>
    <span className="method-list-item-validation">
      <code>string</code>
    </span>
  </h4>
  <div class="method-list-item-description">

The relative file path. Should be of the format `folder/subfolder/filename.png`. The bucket must already exist before attempting to upload.

  </div>
  
</li>


<li className="method-list-item">
  <h4 className="method-list-item-label">
    <span className="method-list-item-label-name">
      fileBody
    </span>
    <span className="method-list-item-label-badge required">
      required
    </span>
    <span className="method-list-item-validation">
      <code>ArrayBuffer</code> | <code>ArrayBufferView</code> | <code>Blob</code> | <code>Buffer</code> | <code>File</code> | <code>FormData</code> | <code>ReadableStream</code> | <code>ReadableStream</code> | <code>URLSearchParams</code> | <code>string</code>
    </span>
  </h4>
  <div class="method-list-item-description">

The body of the file to be stored in the bucket.

  </div>
  
</li>


<li className="method-list-item">
  <h4 className="method-list-item-label">
    <span className="method-list-item-label-name">
      fileOptions
    </span>
    <span className="method-list-item-label-badge false">
      optional
    </span>
    <span className="method-list-item-validation">
      <code>FileOptions</code>
    </span>
  </h4>
  <div class="method-list-item-description">

HTTP headers.
`cacheControl`: string, the `Cache-Control: max-age=<seconds>` seconds value.
`contentType`: string, the `Content-Type` header value. Should be specified if using a `fileBody` that is neither `Blob` nor `File` nor `FormData`, otherwise will default to `text/plain;charset=UTF-8`.
`upsert`: boolean, whether to perform an upsert.

  </div>
  
</li>

</ul>


## Notes

- Policy permissions required:
  - `buckets` permissions: none 
  - `objects` permissions: `update` and `select`
- For React Native, using either `Blob`, `File` or `FormData` does not work as intended. Update file using `ArrayBuffer` from base64 file data instead, see example below.










## Examples

### Update file



<Tabs
  defaultActiveId="js"
  groupId="reference/supabase-js"
  values={[{ label: 'JavaScript', value: 'js' }]}>

<TabsPanel id="js" label="js">

```js
const avatarFile = event.target.files[0]
const { data, error } = await supabase
  .storage
  .from('avatars')
  .update('public/avatar1.png', avatarFile, {
    cacheControl: '3600',
    upsert: false
  })
```


</TabsPanel>

</Tabs>

### Update file using `ArrayBuffer` from base64 file data



<Tabs
  defaultActiveId="js"
  groupId="reference/supabase-js"
  values={[{ label: 'JavaScript', value: 'js' }]}>

<TabsPanel id="js" label="js">

```js
import {decode} from 'base64-arraybuffer'

const { data, error } = await supabase
  .storage
  .from('avatars')
  .update('public/avatar1.png', decode('base64FileData'), {
    contentType: 'image/png'
  })
```


</TabsPanel>

</Tabs>