# General Translation Platform: ブランチを作成
URL: https://generaltranslation.com/ja/docs/platform/openapi/reference/project/create-branch.mdx
Docs index: https://generaltranslation.com/llms.txt
Description: 新しいブランチを作成するか、デフォルトブランチの名前変更と確認を行います。「ブランチを作成」の API リファレンス。

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## Endpoint

`POST https://api.gtx.dev/v2/project/branches/create`

**Operation ID:** `createBranch`

**Tags:** `Project`

**Summary:** Create a branch

Create a new branch, or rename and confirm the default branch.

Authentication: required. Send an API key in the `Authorization: Bearer <key>` header when authenticating.

### Parameters

- `gt-api-version` (header, "2025-01-01.v0" | "2025-11-03.v1" | "2026-02-18.v1" | "2026-03-06.v1", optional): API contract version. Defaults to the oldest supported version.
- `gt-project-id` (header, string, optional): Target project ID when no project ID is present in the path. Project API keys default to their bound project. If supplied, the header must match both the path target and the key’s bound project.

### Request body (required)

Body (`application/json`, object):
- `branchName` (string, required)
- `defaultBranch` (boolean) Default: `false`.

### Responses

**200**: Created or existing branch
Response body (`application/json`, object):
- `branch` (object, required)
  - `id` (string, required)
  - `name` (string, required)

**400**: Request error
Response body (`application/json`, object):
- `error` (string, required)

Response body (`text/html`, string):

**401**: Request error
Response body (`application/json`, object):
- `error` (string, required)

Response body (`text/html`, string):

**403**: Request error
Response body (`application/json`, object):
- `error` (string, required)

Response body (`text/html`, string):

**409**: Request error
Response body (`application/json`, object):
- `error` (string, required)

Response body (`text/html`, string):

**413**: Request error
Response body (`application/json`, object):
- `error` (string, required)

Response body (`text/html`, string):

**429**: Request error
Response body (`application/json`, object):
- `error` (string, required)

Response body (`text/html`, string):

**500**: Request error
Response body (`application/json`, object):
- `error` (string, required)

Response body (`text/html`, string):

Complete OpenAPI 3.1 specification: https://generaltranslation.com/openapi.yaml

OpenAPI schema: [openapi.json](https://generaltranslation.com/openapi.json)

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