---
title: "Create a new namespace"
method: POST
path: "/v1/namespace/{id}/create"
tags: ["Namespace", "Metadata"]
---

# Create a new namespace

`POST /v1/namespace/{id}/create`

Create new namespace `id`.

During the creation process, the implementation may modify user-provided `properties`, 
such as adding additional properties like `created_at` to user-provided properties, 
omitting any specific property, or performing actions based on any property value.

## Path parameters

- `id` string, required

## Query parameters

- `delimiter` string, nullable — An opaque token that allows pagination for list operations (e.g. ListNamespaces). For an initial request of a list operation, if the implementation cannot return all items in one response, or if there are more items than the page limit specified in the request, the implementation must return a page token in the response, indicating there are more results available. After the initial request, the value of the page token from each response must be used as the page token value for the next request. Caller must interpret either `null`, missing value or empty string value of the page token from the implementation's response as the end of the listing results.

## Request body

- CreateNamespaceRequest
  - `id` string[]
  - `mode` 'CREATE' | 'EXIST_OK' | 'OVERWRITE' — There are three modes when trying to create a namespace, to differentiate the behavior when a namespace of the same name already exists: * CREATE: the operation fails with 400. * EXIST_OK: the operation succeeds and the existing namespace is kept. * OVERWRITE: the existing namespace is dropped and a new empty namespace with this name is created.
  - `properties` unknown

## Response `200`

Result of creating a namespace

- CreateNamespaceResponse
  - `properties` unknown

## Other responses

- `400` — Indicates a bad request error. It could be caused by an unexpected request body format or other forms of request validation failure, such as invalid json. Usually serves application/json content, although in some cases simple text/plain content might be returned by the server's middleware.
- `401` — Unauthorized. The request lacks valid authentication credentials for the operation.
- `403` — Forbidden. Authenticated user does not have the necessary permissions.
- `404` — A server-side problem that means can not find the specified resource.
- `406` — Not Acceptable / Unsupported Operation. The server does not support this operation.
- `409` — The request conflicts with the current state of the target resource.
- `503` — The service is not ready to handle the request. The client should wait and retry. The service may additionally send a Retry-After header to indicate when to retry.
- `5XX` — A server-side problem that might not be addressable from the client side. Used for server 5xx errors without more specific documentation in individual routes.

## Changes

- **2025-07-29** `40a3bc489d46` — 8 breaking, 16 warning, 16 info
  - the response property `type` became optional for the status `400`
  - the response property `type` became optional for the status `401`
  - the response property `type` became optional for the status `403`
  - the response property `type` became optional for the status `404`
  - …36 more
- **2025-07-25** `8769f8e36bc4` — 1 breaking, 4 warning, 3 info
  - removed the required property `name` from the response with the `200` status
  - removed the request property `name`
  - removed the request property `options`
  - removed the request property `parent`
  - …4 more
- **2025-07-22** `ac7519693c52` — 1 info
  - the request property `name` became optional
- **2025-07-21** `db7569410aa4` — 1 info
  - api tag `Metadata` added
- **2025-07-21** `6790486d1fac` — 11 breaking, 22 warning, 32 info
  - added the new required request property `name`
  - request property `mode` was restricted to a list of enum values
  - the request property `mode` became required
  - removed the required property `code` from the response with the `400` status
  - …61 more

[Change history](https://skmtc.dev/lance-format/apis/lance-namespace-specification/changes/v1/namespace/:id/create/post.md)

---

[API](https://skmtc.dev/lance-format/apis/lance-namespace-specification.md) · [All operations](https://skmtc.dev/lance-format/apis/lance-namespace-specification/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/lance-format/lance-namespace-specification/revisions/40a3bc489d46/schema)