> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://fastpix.com/docs/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://fastpix.com/docs/_mcp/server.

# Enable video chapters on a media

PATCH https://api.fastpix.com/v1/on-demand/{mediaId}/chapters
Content-Type: application/json

This endpoint will be deprecated on September 30, 2026. To generate chapters for an existing media, use [Generate video chapters](/docs/in-video-ai-api/video-chapters/create-ai-chapters) instead.

This endpoint enables you to generate chapters for an existing media file.

#### How it works

1. Make a `PATCH` request to this endpoint, replacing `<mediaId>` with the ID of the media for which you want to generate chapters.
2. Include the `chapters` parameter in the request body to enable.
3. The response contains the updated media data, confirming the changes made.

You can use the video.mediaAI.chapters.ready webhook event to track and notify about the chapters generation.

**Use case:** This is particularly useful when a user uploads a video and later decides to enable chapters without re-uploading the entire video.

Related guide: Video chapters

Reference: https://fastpix.com/docs/in-video-ai-api/video-chapters/update-media-chapters

## Authentication

- `Authorization` header (basic auth, required) — FastPix APIs are secured with Basic Authentication. Use your Access Token ID as the username and Secret Key as the password in the Authorization header of each API request. * Username: Access Token ID * Password: Secret Key Activate your FastPix account to generate your API credentials. See the guide here

## Request

### Path parameters

- `mediaId` (string, required) — The unique identifier assigned to the media when created. The value must be a valid UUID.

### Body (application/json)

This endpoint expects an object.

- `chapters` (boolean, required, default: true) — Enable or disable the chapters feature for the media. Set to `true` to enable chapters or `false` to disable.

## Response

### 200

Media details updated successfully with the chapters feature enabled or disabled

- `success` (boolean, optional) — Shows the request status. Returns true for success and false for failure.
- `data` (ChaptersResponse, optional)

## Types

### ChaptersResponse

- `mediaId` (string, optional)
- `isChaptersEnabled` (boolean, optional)

## Examples

**Request**

```json
{
  "chapters": true
}
```

**Response**

```json
{
  "success": true,
  "data": {
    "mediaId": "c695988b-ff84-42ae-bb21-10f284fedb0e",
    "isChaptersEnabled": true
  }
}
```

**SDK Code**

```python
import requests

url = "https://api.fastpix.com/v1/on-demand/4fa85f64-5717-4562-b3fc-2c963f66afa6/chapters"

payload = { "chapters": True }
headers = {
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers, auth=("<username>", "<password>"))

print(response.json())
```

```javascript
const url = 'https://api.fastpix.com/v1/on-demand/4fa85f64-5717-4562-b3fc-2c963f66afa6/chapters';
const credentials = btoa("<username>:<password>");

const options = {
  method: 'PATCH',
  headers: {
    Authorization: `Basic ${credentials}`,
    'Content-Type': 'application/json'
  },
  body: '{"chapters":true}'
};

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 := "https://api.fastpix.com/v1/on-demand/4fa85f64-5717-4562-b3fc-2c963f66afa6/chapters"

	payload := strings.NewReader("{\n  \"chapters\": true\n}")

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

	req.SetBasicAuth("<username>", "<password>")
	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("https://api.fastpix.com/v1/on-demand/4fa85f64-5717-4562-b3fc-2c963f66afa6/chapters")

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

request = Net::HTTP::Patch.new(url)
request.basic_auth("<username>", "<password>")
request["Content-Type"] = 'application/json'
request.body = "{\n  \"chapters\": true\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("https://api.fastpix.com/v1/on-demand/4fa85f64-5717-4562-b3fc-2c963f66afa6/chapters")
  .basicAuth("<username>", "<password>")
  .header("Content-Type", "application/json")
  .body("{\n  \"chapters\": true\n}")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('PATCH', 'https://api.fastpix.com/v1/on-demand/4fa85f64-5717-4562-b3fc-2c963f66afa6/chapters', [
  'body' => '{
  "chapters": true
}',
  'headers' => [
    'Content-Type' => 'application/json',
  ],
    'auth' => ['<username>', '<password>'],
]);

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

```csharp
using RestSharp;
using RestSharp.Authenticators;

var client = new RestClient("https://api.fastpix.com/v1/on-demand/4fa85f64-5717-4562-b3fc-2c963f66afa6/chapters");
client.Authenticator = new HttpBasicAuthenticator("<username>", "<password>");
var request = new RestRequest(Method.PATCH);

request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"chapters\": true\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let credentials = Data("<username>:<password>".utf8).base64EncodedString()

let headers = [
  "Authorization": "Basic \(credentials)",
  "Content-Type": "application/json"
]
let parameters = ["chapters": true] as [String : Any]

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

let request = NSMutableURLRequest(url: NSURL(string: "https://api.fastpix.com/v1/on-demand/4fa85f64-5717-4562-b3fc-2c963f66afa6/chapters")! 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()
```