---
title: "Check if a namespace exists"
method: POST
path: "/v1/namespace/{id}/exists"
tags: ["Namespace", "Metadata"]
---

# Check if a namespace exists

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

Check if namespace `id` exists.

This operation must behave exactly like the DescribeNamespace API,
except it does not contain a response body.

REST NAMESPACE ONLY
REST namespace conveys the result through the HTTP status code with no response body.
The REST response maps to the `NamespaceExistsResponse` model as follows:
- a `200` response means the namespace exists; a `404` response means it does not
- response headers map to `context` via the `header.` prefix (see the `Context` schema)

## Path parameters

- `id` string, required

## Query parameters

- `delimiter` string

## Request body

- NamespaceExistsRequest
  - `identity` Identity — Identity information of a request.
    - `api_key` string — API key for authentication. REST NAMESPACE ONLY This is passed via the `x-api-key` header.
    - `auth_token` string — Bearer token for authentication. REST NAMESPACE ONLY This is passed via the `Authorization` header with the Bearer scheme (e.g., `Bearer <token>`).
  - `context` unknown
  - `id` string[]

## Response `200`

Success, no content

## 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.
- `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

> 54 revisions in range; 2 could not be searched.

- **2026-07-01** `591cd95574b0` — 6 info
  - added the optional property `context` to the response with the `400` status
  - added the optional property `context` to the response with the `401` status
  - added the optional property `context` to the response with the `403` status
  - added the optional property `context` to the response with the `404` status
  - …2 more
- **2026-01-02** `83f8516f0507` — 1 info
  - added the new optional request property `context`
- **2026-01-01** `c987c26ccb0f` — 1 info
  - added the new optional request property `identity`
- **2025-12-20** `5d6099d672d3` — 6 breaking, 6 warning, 6 info
  - the `code` response property's min was decreased from `400.00` to `0.00` for the response status `400`
  - the `code` response property's min was decreased from `400.00` to `0.00` for the response status `401`
  - the `code` response property's min was decreased from `400.00` to `0.00` for the response status `403`
  - the `code` response property's min was decreased from `400.00` to `0.00` for the response status `404`
  - …14 more
- **2025-07-29** `40a3bc489d46` — 6 breaking, 12 warning, 12 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`
  - …26 more

[Full history](https://skmtc.dev/lance-format/apis/lance-namespace-specification/changes/v1/namespace/:id/exists/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/541331733d0c/schema)