# Source: https://developers.google.com/youtube/v3/docs/captions/insert.md.txt

# Captions: insert

Uploads a caption track.

This method supports media upload. Uploaded files must conform to these constraints:

- **Maximum file size:** 100MB
- **Accepted Media MIME types:** `text/xml`, `application/octet-stream`, `*/*`

**Quota impact:** A call to this method has a [quota cost](https://developers.google.com/youtube/v3/determine_quota_cost) of 400 units.

## Common use cases

The list below shows common use cases for this method. Hover over a use case to see its description, or click on a use case to load sample parameter values in the APIs Explorer. You can open the [fullscreen APIs Explorer](https://developers.google.com/youtube/v3/docs/captions/insert#) to see code samples that dynamically update to reflect the parameter values entered in the Explorer.

The table below shows common use cases for this method. You can click on a use case name to load sample parameter values in the APIs Explorer. Or you can see code samples for a use case in the fullscreen APIs Explorer by clicking on the code icon below a use case name. In the fullscreen UI, you can update parameter and property values and the code samples will dynamically update to reflect the values you enter.  
This method has one common use case, which is described below. The buttons below the description populate the APIs Explorer with sample values or open the fullscreen APIs Explorer to show code samples that use those values. The code samples also dynamically update if you change the values.

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## Request

### HTTP request

```
POST https://www.googleapis.com/upload/youtube/v3/captions
```

### Authorization

This request requires authorization with at least one of the following scopes. To read more about authentication and authorization, see [Implementing OAuth 2.0 authorization](https://developers.google.com/youtube/v3/guides/authentication).

|                        Scope                        |
|-----------------------------------------------------|
| `https://www.googleapis.com/auth/youtube.force-ssl` |
| `https://www.googleapis.com/auth/youtubepartner`    |

### Parameters

The following table lists the parameters that this query supports. All of the parameters listed are query parameters.

|                                                                                                                                                                                                                                                                                                                                                                                                                                    Parameters                                                                                                                                                                                                                                                                                                                                                                                                                                    ||
|--------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| **Required parameters**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |||
| `part`                   | `string` The **part** parameter specifies the `caption` resource parts that the API response will include. Set the parameter value to `snippet`. The following list contains the `part` names that you can include in the parameter value: - `id` - `snippet`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **Optional parameters**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |||
| `onBehalfOfContentOwner` | `string` This parameter can only be used in a properly [authorized request](https://developers.google.com/youtube/v3/guides/authentication). **Note:** This parameter is intended exclusively for YouTube content partners. The **onBehalfOfContentOwner** parameter indicates that the request's authorization credentials identify a YouTube CMS user who is acting on behalf of the content owner specified in the parameter value. This parameter is intended for YouTube content partners that own and manage many different YouTube channels. It allows content owners to authenticate once and get access to all their video and channel data, without having to provide authentication credentials for each individual channel. The actual CMS account that the user authenticates with must be linked to the specified YouTube content owner. |
| `sync`                   | `boolean` This parameter has been deprecated. The **sync** parameter indicates whether YouTube should automatically synchronize the caption file with the audio track of the video. If you set the value to `true`, YouTube will disregard any time codes that are in the uploaded caption file and generate new time codes for the captions. You should set the `sync` parameter to `true` if you are uploading a transcript, which has no time codes, or if you suspect the time codes in your file are incorrect and want YouTube to try to fix them.                                                                                                                                                                                                                                                                                               |

### Request body

Provide a [caption](https://developers.google.com/youtube/v3/docs/captions#resource) resource in the request body.
For that resource:

You must specify a value for these properties:

- `snippet.videoId`
- `snippet.language`
- `snippet.name`

You can set values for these properties:

- `snippet.videoId`
- `snippet.language`
- `snippet.name`
- `snippet.isDraft`

## Response

If successful, this method returns a [caption](https://developers.google.com/youtube/v3/docs/captions#resource) resource in the response body.

## Errors

The following table identifies error messages that the API could return in response to a call to this method. For more details, see [YouTube Data API - Errors](https://developers.google.com/youtube/v3/docs/errors).

|      Error type      |   Error detail    |                                                                                                                                                                                  Description                                                                                                                                                                                  |
|----------------------|-------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `badRequest (400)`   | `contentRequired` | The request does not contain the caption track contents.                                                                                                                                                                                                                                                                                                                      |
| `conflict (409)`     | `captionExists`   | The specified video already has a caption track with the given `snippet.language` and `snippet.name`. A video can have multiple tracks for the same language, but each track must have a different name. There are multiple ways to address the error. You could delete the existing track and then insert a new one or change the name of the new track before inserting it. |
| `forbidden (403)`    | `forbidden`       | The permissions associated with the request are not sufficient to upload the caption track. The request might not be properly authorized.                                                                                                                                                                                                                                     |
| `invalidValue (400)` | `invalidMetadata` | The request contains invalid metadata values, which prevent the track from being created. Confirm that the request specifies valid values for the `snippet.language`, `snippet.name`, and `snippet.videoId` properties. The `snippet.isDraft` property can also be included, but it is not required.                                                                          |
| `notFound (404)`     | `videoNotFound`   | The video identified by the `videoId` parameter couldn't be found.                                                                                                                                                                                                                                                                                                            |
| `invalidValue (400)` | `nameTooLong`     | The `snippet.name` specified in the request is too long. The maximum length supported is 150 characters.                                                                                                                                                                                                                                                                      |

## Try it!

Use the APIs Explorer to call this API and see the API request and response.