Mark a work item type as default

POST/api/v2/workspaces/{slug}/projects/{project_id}/work-item-types/{pk}/mark-default/

Promote a type to the project's default — the type new work items get when the request supplies no type_id.

Exactly one type per project is the default. Marking a new one clears the flag on the type that held it, so promotion is a single request rather than a demote-then-promote pair. There is no way to have zero defaults, and no way to have two.

There is no request body. The type is identified by {pk} in the path, and the response is the updated type.

is_default is deliberately not writable through create or update. Moving the flag has a side effect on another row, so it gets its own endpoint instead of hiding inside a PATCH.

This call works in either work item type mode. It sets the default for this project only. For a type the project owns, is_default moves too. For a type shared from the workspace, only is_default_in_project changes, and the workspace default stays where it is.

Path Parameters

slug:requiredstring

The workspace slug. It appears in your Plane URLs. In https://app.plane.so/my-team/projects/, the slug is my-team.

project_id:requiredstring (uuid)

The project the type belongs to.

pk:requiredstring (uuid)

The id of the work item type to make the default.

Body Parameters

None. Send the request without a body.

Response shaping

fields:optionalstring

Comma-separated list of fields to return. Unrequested keys are omitted from the response, not returned as null, so absent means "not requested" and null means "actually null". id always comes back whether or not you name it.

Pass all for every requestable field. An unknown name is a 400 that lists the valid set and suggests the closest match, so a typo can't silently cost you the saving.

Requestable here: created_at, description, external_id, external_source, governance_mode, id, is_active, is_active_in_project, is_default, is_default_in_project, is_epic, level, logo_props, name, project_ids, rollout, updated_at, updated_by_id.

See Sparse fields.

Scopes

projects.work_item_types:write

Errors

Status	Code	Cause
400	invalid_request	The request could not be processed as sent.
401	unauthorized	Missing or invalid credentials.
402	payment_required	The feature this endpoint belongs to isn't enabled on your plan, or is switched off.
403	forbidden	Your role or token scope can't update work item types.
404	not_found	No such type, project, or workspace — or the type belongs to another project.
406	not_acceptable	The Accept header asks for a representation the API can't produce.
413	payload_too_large	The request body is over the size limit.
415	unsupported_media_type	The Content-Type isn't one this endpoint accepts.
429	rate_limited	Throttled. Honor the Retry-After header before retrying.

Mark a work item type as default

curl -X POST \
  "https://api.plane.so/api/v2/workspaces/my-team/projects/4af68566-94a4-4eb3-94aa-50dc9427067b/work-item-types/d1e7a4c9-2b58-4f36-9a0e-7c3b5d81f240/mark-default/" \
  -H "X-Api-Key: $PLANE_API_KEY"

import requests

response = requests.post(
    "https://api.plane.so/api/v2/workspaces/my-team/projects/4af68566-94a4-4eb3-94aa-50dc9427067b/work-item-types/d1e7a4c9-2b58-4f36-9a0e-7c3b5d81f240/mark-default/",
    headers={"X-Api-Key": "your-api-key"},
)
print(response.json()["is_default"])  # True

const response = await fetch(
  "https://api.plane.so/api/v2/workspaces/my-team/projects/4af68566-94a4-4eb3-94aa-50dc9427067b/work-item-types/d1e7a4c9-2b58-4f36-9a0e-7c3b5d81f240/mark-default/",
  {
    method: "POST",
    headers: {
      "X-Api-Key": "your-api-key",
    },
  },
);
const data = await response.json();

Response200

{
  "id": "d1e7a4c9-2b58-4f36-9a0e-7c3b5d81f240",
  "name": "Bug",
  "description": "Something is broken and needs a fix",
  "logo_props": {
    "in_use": "icon",
    "icon": {
      "name": "AlertCircle",
      "background_color": "#EF5974"
    }
  },
  "is_epic": false,
  "is_default": true,
  "is_active": true,
  "is_active_in_project": true,
  "is_default_in_project": true,
  "level": 0,
  "governance_mode": "any",
  "rollout": "none",
  "project_ids": ["4af68566-94a4-4eb3-94aa-50dc9427067b"],
  "external_id": null,
  "external_source": null,
  "created_at": "2026-01-14T09:24:03.117482Z",
  "updated_at": "2026-01-15T11:37:10.117482Z",
  "updated_by_id": "16c61a3a-512a-48ac-b0be-b6b46fe6f430"
}

The response only shows the type you promoted

The previously default type is demoted in the same operation, but it is not included in the response. If you are holding cached type objects, refresh the whole set with List work item types after promoting, or your cache will briefly show two defaults.

The default type is protected

Once a type is the default it cannot be deleted, and it cannot be deactivated with "is_active": false. Both are the same guard from two directions: a project always needs somewhere for untyped work items to land. To retire the current default, promote a replacement first — this call — and then delete or deactivate the old one.