---
title: "POST Field Reference"
canonical: https://www.aurigma.com/docs/us8/post-field-reference-iu.htm
product: "Upload Suite 8"
---

# POST Field Reference
 
This topic contains information about POST fields (both standard and custom) which are sent by ActiveX/Java Uploader. Use it when writing the server-side upload processing code. You should extract them in the same manner as if they were sent through the standard HTML form. See [Saving Uploaded Files in ActiveX/Java Uploader ASP.NET](https://www.aurigma.com/docs/us8/saving-uploaded-files-in-aspnet-iu.htm.md) and [Saving Uploaded Files in ActiveX/Java Uploader PHP](https://www.aurigma.com/docs/us8/saving-uploaded-files-in-php-iu.htm.md) topics for more details on how to work with them.

## Standard Fields
 
**Note** 
If you use ActiveX/Java Uploader ASP.NET or ActiveX/Java Uploader PHP you can refer standard fields via the PostFields[PostFields (ASP.NET)](https://www.aurigma.com/docs/us8/JA_T_Aurigma_ImageUploader_PostFields.htm.md)[PostFields (PHP)](https://www.aurigma.com/docs/us8/JA_T_P_PostFields.htm.md) constants.
 
The table below contains a list of POST fields that are generated and uploaded by ActiveX/Java Uploader, if they are enabled by the [metadata.enableAllStandardFields(Boolean)](https://www.aurigma.com/docs/us8/JA_M_J_$au_metadata_enableAllStandardFields_1_7dfaceb5.htm.md) or [metadata.enableStandardField(String, Boolean)](https://www.aurigma.com/docs/us8/JA_M_J_$au_metadata_enableStandardField_2_e0636892.htm.md) methods.
 
|  Name |  Type |  Description |
| --- | --- | --- |
   |  Upload Information | Upload Information | Upload Information |
 |  **PackageIndex** |  **Integer** |  Zero-based index of the package inside the current upload session.<br> <br>Using this field you can recognize the order of the uploaded files if they were sent in different packages. |
 |  **PackageCount** |  **Integer** |  A total number of packages in the current upload session.<br> <br>In particular, when FilesPerPackage[FilesPerPackage (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_UploadSettings_FilesPerPackage.htm.md)[FilesPerPackage (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_UploadSettings_FilesPerPackage.htm.md)[filesPerPackage (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_uploadSettings_filesPerPackage.htm.md) is `1`, it can be used to get a total number of files uploaded within this upload session. |
 |  **PackageGuid** |  **GUID** |  Unique identifier of the current upload session.<br> <br>When the upload is separated into several packages, all of them will have the same GUID. You can use it to determine whether files are uploaded in the same session (useful for concurrent uploads from several users) or not. |
 |  **PackageFileCount** |  **Integer** |  Number of files uploaded in the current package. |
 |  **RequestComplete** |  **Integer** |  Request integrity flag.<br><br>This field is sent at the end of the upload request. Thus, if this field is not received the upload is considered as cancelled. |
 |  **PackageComplete** |  **Integer** |  End of package marker. This field is always `1` and is represented only in the last request of a package. |
 |  **RequestCount** |  **Integer** |  Number of requests associated with a package. This field is sent in the end of the package. |
 |  **UploaderID** |  **String** |  Unique client identifier of an uploader. You can use it to determine what uploader sent the package (or chunk). |
 |  Name |  Type |  Description |
 |  Original File Information | Original File Information | Original File Information |
 |  **SourceName\_*N*** ^\*^ |  **String** |  Name of the original *N*th file. If entire folder is uploaded, this field includes a folder structure, i.e. relative path of the file (relatively the folder which is being uploaded, including this folder name).<br> <br>It is useful to employ this field to get the name of the original file when only a resized copy of an image is uploaded. |
 |  **SourceSize\_*N*** ^\*^ |  **Integer** |  Size of the original *N*th file in bytes. |
 |  **SourceCreatedDateTime\_*N*** ^\*^ |  **Time** |  Creation date of the original *N*th file in EXIF-style format:<br> `YYYY:MM:DD hh:mm:ss`<br> For example, *28th of March, 2:40PM* would be:<br> `2005:03:28 14:40:00`<br> <br>**Note** <br>When ActiveX/Java Uploader is used in non-Internet Explorer browsers, this field contains an empty value. |
 |  **SourceLastModifiedDateTime\_*N*** ^\*^ |  **Time** |  The last modification date of the original *N*th file in EXIF-style format:<br> `YYYY:MM:DD hh:mm:ss`<br> For example, *28th of March, 2:40PM* would be:<br> `2005:03:28 14:40:00` |
 |  **SourceCreatedDateTimeLocal\_*N*** ^\*^ |  **Time** |  The local creation date of the original *N*th file in EXIF-style format:<br> `YYYY:MM:DD hh:mm:ss`<br> For example, *28th of March, 2:40PM* would be looking in the following way:<br> `2005:03:28 14:40:00`<br> <br>**Note** <br>When uploading in non-Internet Explorer browsers, this field contains an empty value. |
 |  **SourceLastModifiedDateTimeLocal\_*N*** ^\*^ |  **Time** |  The local last modification date of the original *N*th file in EXIF-style format:<br> `YYYY:MM:DD hh:mm:ss`<br> For example, *28th of March, 2:40PM* would be:<br> `2005:03:28 14:40:00` |
 |  **SourceWidth\_*N*** ^\*^ |  **Integer** |  Width of the original *N*th file in pixels if it is an image. Otherwise, this field contains `0`. |
 |  **SourceHeight\_*N*** ^\*^ |  **Integer** |  Height of the original *N*th file in pixels if it is an image. Otherwise, this field contains `0`. |
 |  **HorizontalResolution\_*N*** ^\*^ |  **Integer** |  Horizontal resolution of the original *N*th file if it is an image (measured in *DPI* - dots per inches). Otherwise, this field contains `0`. |
 |  **VerticalResolution\_*N*** ^\*^ |  **Integer** |  Vertical resolution of the original *N*th file if it is an image (measured in *DPI* - dots per inches). Otherwise, this field contains `0`. |
 |  Name |  Type |  Description |
 |  Converted File Information | Converted File Information | Converted File Information |
 |  The fields from this group are sent if at least one Converter[Converter (ASP.NET)](https://www.aurigma.com/docs/us8/JA_T_Aurigma_ImageUploader_Converter.htm.md)[Converter (PHP)](https://www.aurigma.com/docs/us8/JA_T_P_Converter.htm.md)[converter (JavaScript)](https://www.aurigma.com/docs/us8/JA_T_J_$au_converter.htm.md) is specified. |
 |  **File*X*\_*N*** ^\*\*^ |  **File** |  The *X*th converted file for the *N*th user-selected file.<br> <br>Depending on the **File*X*Mode\_*N*** field value, this field contains a file with one of the following names:<br> <ul> <li><code><em>name</em>.<em>ext</em></code> for <code>sourceFile</code> mode</li> <li><code><em>name</em>.<em>ext</em>_Thumbnail<em>X</em>.jpg</code> for <code>thumbnail</code> mode</li> <li><code><em>name</em>.<em>ext</em>_Icon<em>X</em>.jpg</code> for <code>icon</code> mode</li> <li><code><em>name</em>.<em>ext</em>_Compressed<em>X</em>.zip</code> for <code>zip</code> mode</li> </ul> |
 |  **File*X*Mode\_*N*** ^\*\*^ |  **String** |  The mode of the *X*th converted file created for the *N*th user-selected file. Possible values are:<br> <ul> <li><code>sourceFile</code> means the <em>X</em>th converted file is a copy of the original file.</li> <li><code>thumbnail</code> means the <em>X</em>th converted file is a resized copy of the original file if it is an image.</li> <li><code>icon</code> means the <em>X</em>th converted file is a system icon associated with the original file type.</li> <li><code>zip</code> means the <em>X</em>th converted file is a ZIP archive of the original file.</li> <li><code>none</code> means the <em>X</em>th converted file was not created.</li> </ul> |
 |  **File*X*Size\_*N*** ^\*\*^ |  **Integer** |  Size of the *X*th converted file created for the *N*th user-selected file (in bytes). |
 |  **File*X*Width\_*N*** ^\*\*^ |  **Integer** |  Actual width of the *X*th converted file created for the *N*th user-selected file if it is an image (in pixels). Otherwise, this field contains `0`.<br> <br>Depending on the Converter.ThumbnailFitMode[ThumbnailFitMode (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Converter_ThumbnailFitMode.htm.md)[ThumbnailFitMode (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_Converter_ThumbnailFitMode.htm.md)[thumbnailFitMode (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_converter_thumbnailFitMode.htm.md), this value may differ from the value specified through the Converter.ThumbnailWidth[ThumbnailWidth (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Converter_ThumbnailWidth.htm.md)[ThumbnailWidth (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_Converter_ThumbnailWidth.htm.md)[thumbnailWidth (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_converter_thumbnailWidth.htm.md) property. This happens because ActiveX/Java Uploader preserves the aspect ratio of the image and seldom can use the same dimensions as specified in thumbnail parameters. |
 |  **File*X*Height\_*N*** ^\*\*^ |  **Integer** |  Actual height of the *X*th converted file created for the *N*th user-selected file if it is an image (in pixels). Otherwise, this field contains `0`.<br> <br>Depending on the **ThumbnailFitMode**, this value may differ from the value specified through the Converter.ThumbnailHeight[ThumbnailHeight (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Converter_ThumbnailHeight.htm.md)[ThumbnailHeight (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_Converter_ThumbnailHeight.htm.md)[thumbnailHeight (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_converter_thumbnailHeight.htm.md) property. This happens because ActiveX/Java Uploader preserves the aspect ratio of the image and seldom can use the same dimensions as specified in thumbnail parameters. |
 |  **File*X*ChunkIndex\_*N*** ^\*\*^ |  **Integer** |  Zero-based index of this chunk of the *X*th converted file created for the *N*th user-selected file.<br> <br>**Note** <br>This field is sent if UploadSettings.ChunkSize[ChunkSize (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_UploadSettings_ChunkSize.htm.md)[ChunkSize (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_UploadSettings_ChunkSize.htm.md)[chunkSize (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_uploadSettings_chunkSize.htm.md) is greater than `0`. |
 |  **File*X*ChunkCount\_*N*** ^\*\*^ |  **Integer** |  Number of chunks of the *X*th converted file created for the *N*th user-selected file.<br> <br>**Note** <br>This field is sent if **ChunkSize** is greater than `0`. |
 |  Name |  Type |  Description |
 |  User Input | User Input | User Input |
 |  **Angle\_*N*** ^\*^ |  **Integer** |  Rotation angle of the *N*th user-specified file (measured in degrees clockwise).<br> <br>You can use it if you want to rotate images on the server side (e.g. if you upload original files only). Possible values are:<br> <ul> <li><code>0</code></li> <li><code>90</code></li> <li><code>180</code></li> <li><code>270</code></li> </ul> |
 |  **Description\_*N*** ^\*^ |  **String** |  User-provided description of the *N*th user-selected file. |
 |  **Tag\_*N*** ^\*^ |  **String** |  Tag attached to the *N*th user-selected file. |
 |  **CropBounds\_*N*** ^\*^ |  **String** |  Crop bounds of the *N*th user-selected image in the following format: `x,y,width,height`. For non-image files this field contains `0,0,0,0` value.<br> <br>You can use it if you want to crop images on the server side (e.g. if you upload only original file). |
 |  ^\*^ The *N* character appended to the field name is a placeholder for an index of this file in the uploaded package. This index is zero-based. For example, ActiveX/Java Uploader sends one file per package, so to retrieve a name of this file use the **SourceName\_0** field (the same is true for other ***XXX*\_*N*** fields).<br> <br>^\*\*^ ActiveX/Java Uploader can generate unlimited number of converted files per each user-selected file and send them to the server. The *X* character is a placeholder for an index of the converted file created for the *N*th user-selected file. Maximum *X* value is not bigger than the number of **Converter** instances added to the Uploader.Converters[Converters (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Uploader_Converters.htm.md)[Converters (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_Uploader_Converters.htm.md)[converters (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_uploader_converters.htm.md) array. For example, if you set two converters, the following fields will be available on the server: **File0\_0** and  **File1\_0**. |
 
**Note** 
Standard POST fields can be renamed using the [metadata.renameStandardField(String, String)](https://www.aurigma.com/docs/us8/JA_M_J_$au_metadata_renameStandardField_2_393e8f3d.htm.md) method. Read the [Configuring POST Format](https://www.aurigma.com/docs/us8/configuring-post-format.htm.md) topic for more details.

## Custom Fields
 
ActiveX/Java Uploader is able to send not only fields described in the table above, but also custom fields. It can be done in two ways:
 
- Using the Metadata.AdditionalFormName[AdditionalFormName (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Metadata_AdditionalFormName.htm.md)[AdditionalFormName (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_Metadata_AdditionalFormName.htm.md)[additionalFormName (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_metadata_additionalFormName.htm.md) property. You just add the `<form>` element somewhere to your code, add elements to it (`<input>`, `<select>`, ` <textarea>` elements are supported), and set its name as a value of this property. Then ActiveX/Java Uploader automatically appends data from this `<form>` to the request that is sent to the server.
- Using the [metadata.addCustomField(String, String, Boolean)](https://www.aurigma.com/docs/us8/JA_M_J_$au_metadata_addCustomField_3_c43e5881.htm.md) method. It takes the name of a field you want to receive on the server and its value. The most convenient place to use this method is the [BeforeUpload](https://www.aurigma.com/docs/us8/JA_E_Uploader_BeforeUpload.htm.md) event. Any custom fields added via this method can be removed by calling the [metadata.removeCustomField(String)](https://www.aurigma.com/docs/us8/JA_M_J_$au_metadata_removeCustomField_1_007649e6.htm.md) method.

## Additional Fields
 
ActiveX/Java Uploader can also extract and generate additional information for user-selected files and send it in POST request. In particular, you can extract EXIF and IPTC metadata from images just by specifying desired fields in the Metadata.Exif[Exif (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Metadata_Exif.htm.md)[Exif (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_Metadata_Exif.htm.md)[exif (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_metadata_exif.htm.md) and Metadata.Iptc[Iptc (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Metadata_Iptc.htm.md)[Iptc (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_Metadata_Iptc.htm.md)[iptc (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_metadata_iptc.htm.md) properties.
 
If it is necessary to organize robust upload and check the integrity of uploaded files, you can use the Metadata.Hash[Hash (ASP.NET)](https://www.aurigma.com/docs/us8/JA_P_Aurigma_ImageUploader_Metadata_Hash.htm.md)[Hash (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_Metadata_Hash.htm.md)[hash (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_metadata_hash.htm.md) property. It specifies a hash algorithm used to generate a hash sum for each user-selected file. Thus, to verify whether a file is uploaded successfully, you need to calculate its hash sum using the same algorithm and compares it with the uploaded one.
 
See the [Uploading Additional Data in ActiveX/Java Uploader ASP.NET](https://www.aurigma.com/docs/us8/uploading-additional-data-in-aspnet-iu.htm.md) and [Uploading Additional Data in ActiveX/Java Uploader PHP](https://www.aurigma.com/docs/us8/uploading-additional-data-in-php-iu.htm.md) topics for details.

## See Also
 
### Reference
 
- Converter Class[Converter (ASP.NET)](https://www.aurigma.com/docs/us8/JA_T_Aurigma_ImageUploader_Converter.htm.md)[Converter (PHP)](https://www.aurigma.com/docs/us8/JA_T_P_Converter.htm.md)[converter (JavaScript)](https://www.aurigma.com/docs/us8/JA_T_J_$au_converter.htm.md)
- Metadata Class[Metadata (ASP.NET)](https://www.aurigma.com/docs/us8/JA_T_Aurigma_ImageUploader_Metadata.htm.md)[Metadata (PHP)](https://www.aurigma.com/docs/us8/JA_T_P_Metadata.htm.md)[metadata (JavaScript)](https://www.aurigma.com/docs/us8/JA_T_J_$au_metadata.htm.md)

### Manual
 
- [Saving Uploaded Files in ActiveX/Java Uploader ASP.NET](https://www.aurigma.com/docs/us8/saving-uploaded-files-in-aspnet-iu.htm.md)
- [Saving Uploaded Files in ActiveX/Java Uploader PHP](https://www.aurigma.com/docs/us8/saving-uploaded-files-in-php-iu.htm.md)
- [Configuring POST Format](https://www.aurigma.com/docs/us8/configuring-post-format.htm.md)
- [Uploading Additional Data in ActiveX/Java Uploader ASP.NET](https://www.aurigma.com/docs/us8/uploading-additional-data-in-aspnet-iu.htm.md)
- [Uploading Additional Data in ActiveX/Java Uploader PHP](https://www.aurigma.com/docs/us8/uploading-additional-data-in-php-iu.htm.md)