---
title: "Collection.SetUniqueFields - Web Scraping API - Mozenda"
slug: "collectionsetuniquefields"
description: "Setting unique fields allows you to avoid duplicates in your data set. Use Collection.SetUniqueFields to do this via the Mozenda API. "
updated: 2024-05-14T14:22:42Z
published: 2024-05-14T14:22:42Z
canonical: "help.mozenda.com/collectionsetuniquefields"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.mozenda.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Collection.SetUniqueFields

### Description

Sets the unique **fields** on the **collection**.

### URL parameters
:::(Info) (URL parameter ordering)
The **URL parameters** below are listed in the order they should be entered in the API **URL**. 
:::

| Name           | Required | Type    | Description                                              |
| -------------- | -------- | ------- | -------------------------------------------------------- |
| `CollectionID` | True     | numeric | Unique identifier of the **collection**.                 |
| `Fields`       | True     | string  | Comma-separated list of **field** names to be set as unique. |

### Responses

| Name                    | Type    | Description                                |
| ----------------------- | ------- | ------------------------------------------ |
| `Result`                | string  | `Success` if the operation was successful. |
| `DuplicateItemsRemoved` | numeric | The number of duplicate **items** removed. |

### Sample Request

```bash
curl -X GET 'https://api.mozenda.com/rest?WebServiceKey=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX&Service=Mozenda10&Operation=Collection.SetUniqueFields&CollectionID=1052&Fields=Col1,Col2,Col3'
```

### Sample responses

#### XML

```xml
<?xml version="1.0" encoding="utf-8" ?>
<CollectionSetUniqueFieldsResponse
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
	<Result>Success</Result>
	<DuplicateItemsRemoved>0</DuplicateItemsRemoved>
</CollectionSetUniqueFieldsResponse>
```

#### JSON (add `&ResponseFormat=JSON`)

```json
{
    "DuplicateItemsRemoved": 0,
    "JsonResult": {
        "Command": "Collection.SetUniqueFields",
        "AutoLoggedIn": false,
        "WebConsoleKey": "",
        "Result": "Success",
        "ErrorCode": "",
        "ErrorDescription": "",
        "ErrorList": [],
        "ExecutionTime": {
            "Ticks": 0,
            "Days": 0,
            "Hours": 0,
            "Milliseconds": 0,
            "Minutes": 0,
            "Seconds": 0,
            "TotalDays": 0,
            "TotalHours": 0,
            "TotalMilliseconds": 0,
            "TotalMinutes": 0,
            "TotalSeconds": 0
        }
    }
}
```