---
title: "metadata.hash Property  ActiveX/Java Uploader JavaScript"
canonical: https://www.aurigma.com/docs/us8/JA_P_J_$au_metadata_hash.htm
product: "Upload Suite 8"
---

# metadata.hash Property ActiveX/Java Uploader JavaScript

Supported browsers: ![Internet Explorer](https://www.aurigma.com/docs/us8/icons/ie8.png)![Firefox](https://www.aurigma.com/docs/us8/icons/firefox.png)![Google Chrome](https://www.aurigma.com/docs/us8/icons/chrome.png)![Safari](https://www.aurigma.com/docs/us8/icons/safari.png)
 
Gets or sets an algorithm to generate a hash value for each user-selected file.

## Syntax
 
```
$au.uploader({
    metadata: {
        //...other params...
        hash: "",
        //...other params...
    }
})
```

```
$au.uploader('uploaderID').metadata().hash(value);
value = $au.uploader('uploaderID').metadata().hash();
```
 
### Property Value
 
Type: **String**
 
The algorithm to generate a hash value for each user-selected file.
 
Possible values are listed in the table below.
 
| Value | Description |
| --- | --- |
| **SHA** | SHA hash algorithm. |
| **MD2** | MD2 hash algorithm. |
| **MD5** | MD5 hash algorithm. |
 
You can specify several hash algorithms separated by semicolon.
 
Default value is **""**.

## Remarks
 
**Note** 
ActiveX/Java Uploader Express does not upload hash sums. See the [Upload Suite Editions](https://www.aurigma.com/docs/us8/upload-suite-editions.htm.md) topic for details.
 
The hash is calculated only for the original file, not for converted files (even if the original file is not uploaded).
 
To get an uploaded hash sum at the server, you should extract POST field which is named in the following way: `HashCodeXXX_N`, where *XXX* is a string value specified in this property (hash algorithm), and *N* is the index of the file in the request. E.g. if the property value is `MD5;SHA`, you will get the following POST fields:
 
- `HashCodeMD5_1`, `HashCodeMD5_2`, etc.
- `HashCodeSHA_1`, `HashCodeSHA_2`, etc.

**Note** 
Hash calculation is quite resource-intensive operation. That is why if you do not need to verify uploaded files on the server, it makes sense to disable this feature to make ActiveX/Java Uploader faster. To do it, just specify empty string in this property.

## See Also
 
### Reference
 
- [Aurigma.ImageUploader.Metadata.Hash ASP.NET PropertyActiveX/Java Uploader](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Metadata_Hash.htm.md)
- [Metadata.Hash PHP PropertyActiveX/Java Uploader](https://www.aurigma.com/docs/us8/JA_P_P_Metadata_Hash.htm.md)