> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://www.comet.com/docs/opik/reference/rest-api/datasets/patch-dataset-item/llms.txt.

# Partially update dataset item by id

PATCH http://localhost:5173/api/v1/private/datasets/items/{itemId}
Content-Type: application/json

Partially update dataset item by id. Only provided fields will be updated.

Reference: https://www.comet.com/docs/opik/reference/rest-api/datasets/patch-dataset-item

## Servers

- `http://localhost:5173/api` (Local server, default)
- `https://www.comet.com/opik/api` (Opik Cloud)

## Request

### Path parameters

- `itemId` (string, required)

### Body (application/json)

This endpoint expects a DatasetItem_Write.

- `source` (enum, required)
  - Allowed values: `manual`, `trace`, `span`, `sdk`
- `data` (JsonNode, required)
- `id` (string, optional) — Stable item identifier. On write, used as the upsert key. If omitted, a new ID is generated. Remains the same across dataset versions
- `trace_id` (string, optional)
- `span_id` (string, optional)
- `description` (string, optional)
- `tags` (list of string, optional)
- `evaluators` (list of EvaluatorItem_Write, optional)
- `execution_policy` (ExecutionPolicy_Write, optional)

## Response

### 204

No content

## Errors

### 404 Not Found Error

Dataset item not found

- `any`

## Types

### JsonNode

### EvaluatorItem_Write

- `name` (string, required)
- `type` (enum, required)
  - Allowed values: `llm_judge`, `code_metric`
- `config` (JsonNode_Write, required)

### ExecutionPolicy_Write

- `runs_per_item` (integer, optional)
- `pass_threshold` (integer, optional)

### JsonNode_Write

## Examples

**Request**

```json
{
  "source": "manual"
}
```

**SDK Code**

```python
import requests

url = "http://localhost:5173/api/v1/private/datasets/items/itemId"

payload = { "source": "manual" }
headers = {"Content-Type": "application/json"}

response = requests.patch(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'http://localhost:5173/api/v1/private/datasets/items/itemId';
const options = {
  method: 'PATCH',
  headers: {'Content-Type': 'application/json'},
  body: '{"source":"manual"}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "http://localhost:5173/api/v1/private/datasets/items/itemId"

	payload := strings.NewReader("{\n  \"source\": \"manual\"\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("http://localhost:5173/api/v1/private/datasets/items/itemId")

http = Net::HTTP.new(url.host, url.port)

request = Net::HTTP::Patch.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"source\": \"manual\"\n}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.patch("http://localhost:5173/api/v1/private/datasets/items/itemId")
  .header("Content-Type", "application/json")
  .body("{\n  \"source\": \"manual\"\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('PATCH', 'http://localhost:5173/api/v1/private/datasets/items/itemId', [
  'body' => '{
  "source": "manual"
}',
  'headers' => [
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("http://localhost:5173/api/v1/private/datasets/items/itemId");
var request = new RestRequest(Method.PATCH);
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"source\": \"manual\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["Content-Type": "application/json"]
let parameters = ["source": "manual"] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "http://localhost:5173/api/v1/private/datasets/items/itemId")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "PATCH"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```

> Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.