curl -X POST 'https://api.elevenlabs.io/v1/studio/projects/project-id/chapters' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "name": "string",
  "from_url": "string"
}'

# POST /v1/studio/projects/{project_id}/chapters (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> Create Chapter

## Critical Gotchas
* Authentication uses the non-standard `xi-api-key` header, not `Authorization: Bearer`. Sending a Bearer token returns HTTP 401.
* Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (`--output speech.mp3`) rather than parsing it.

## cURL
curl -X POST 'https://api.elevenlabs.io/v1/studio/projects/project-id/chapters' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"name":"string","from_url":"string"}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| project_id | path | string | Yes | The ID of the Studio project. |
| name | body | string | Yes | The name of the chapter, used for identification only. |
| from_url | body | string | No | An optional URL from which we will extract content to ini... |

## Response (200 OK)
{"chapter":{"can_be_downloaded":true,"chapter_id":"aw1NgEzBg83R7vgmiJt6"}}

---
Need an API key? Get one at https://elevenlabs.io/app/sign-up

POST

/v1/studio/projects/{project_id}/chapters

ElevenLabs API

Create Chapter

Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03 · upstream hash matched

Actions

Agents: curl -H "Accept: text/markdown" this URL
→ 220 tokens · Vary: Accept

Critical gotchas

Authentication uses the non-standard xi-api-key header, not Authorization: Bearer. Sending a Bearer token returns HTTP 401.

Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (--output speech.mp3) rather than parsing it.

cURL

curl -X POST 'https://api.elevenlabs.io/v1/studio/projects/project-id/chapters' \  -H "xi-api-key: $ELEVENLABS_API_KEY" \  -H 'Content-Type: application/json' \  -d '{  "name": "string",  "from_url": "string"}'

Get a free ElevenLabs API key → sponsored

Parameters

Name	In	Type	Required	Description
project_id	path	string	Yes	The ID of the Studio project.
name	body	string	Yes	The name of the chapter, used for identification only.
from_url	body	string	No	An optional URL from which we will extract content to initialize the Studio project. If this is set, 'from_url' and 'from_content' must be null. If neither 'from_url', 'from_document', 'from_content' are provided we will initialize the Studio project as blank.

Response 200 OK

{
  "chapter": {
    "can_be_downloaded": true,
    "chapter_id": "aw1NgEzBg83R7vgmiJt6",
    "content": {
      "blocks": []
    },
    "conversion_progress": 0.5,
    "last_conversion_date_unix": 1714204800,
    "name": "Chapter 1",
    "state": "default",
    "statistics": {
      "characters_converted": 200,
      "characters_unconverted": 100,
      "paragraphs_converted": 5,
      "paragraphs_unconverted": 3
    }
  }
}