# Change an existing project member's role

PATCH

/v1/projects/{projectId}/memberships/{userId}

```sh
curl --request PATCH \
  --url https://example.com/v1/projects/example/memberships/example \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{ "role": "viewer" }'
```

## Authorizations

- **[bearerAuth](https://docs.kindgi.com/v0.1.10/reference/api.md#bearerauth)**

## Parameters

### Path Parameters

**projectId**

required

string

ProjectId — opaque branded string.

**userId**

required

string

UserId — opaque branded string.

### Header Parameters

**Idempotency-Key**

string

\>= 1 characters

Caller-supplied idempotency key, scoped to the caller: the same key from someone else in the tenant is their own request (from 0.1.5). Retries with the same key return the original response byte-identical (per `docs/API-ROUTE-CONVENTIONS.md` §3.1). A retry sent while the first request still runs is answered `409 idempotency-key-in-flight` with `Retry-After`, on a runtime whose store holds keys (from 0.1.5); retry after it, and you get the first request’s answer. An answer that carries a secret (a new API key or public run token, a session token, a generated signing secret) isn’t kept: a retry gets `409 idempotency-key-replay-withheld`, with the first request’s status and when it succeeded (from 0.1.5).

## Request Bodyrequired

application/json

object

**role**

required

A role to give on a project: `owner`, `admin`, `editor` or `viewer`, each including the ones after it. `member` is refused (400): give `viewer`.

string

Allowed values: viewer editor owner admin

## Responses

### 204

Role updated. No body.

### 400

Malformed request body.

application/json

object

**error**

required

object

**code**

required

Stable machine-readable discriminant. Values match domain error codes (see `docs/API-ROUTE-CONVENTIONS.md` §4.3).

string

**message**

required

string

**details**

Optional, kind-specific.

object

**_key_**

additional properties

any

**requestId**

required

Server-assigned request id; also echoed via `X-Request-Id` header.

string

##### Examplegenerated

```json
{
  "error": {
    "code": "example",
    "message": "example",
    "details": {},
    "requestId": "example"
  }
}
```

### 401

Missing / malformed / expired / revoked bearer token.

application/json

object

**error**

required

object

**code**

required

Stable machine-readable discriminant. Values match domain error codes (see `docs/API-ROUTE-CONVENTIONS.md` §4.3).

string

**message**

required

string

**details**

Optional, kind-specific.

object

**_key_**

additional properties

any

**requestId**

required

Server-assigned request id; also echoed via `X-Request-Id` header.

string

##### Examplegenerated

```json
{
  "error": {
    "code": "example",
    "message": "example",
    "details": {},
    "requestId": "example"
  }
}
```

### 403

The person is one a site signs in, who holds only the grants their site’s sign-in writes (`site-person-grants-managed`).

application/json

object

**error**

required

object

**code**

required

Stable machine-readable discriminant. Values match domain error codes (see `docs/API-ROUTE-CONVENTIONS.md` §4.3).

string

**message**

required

string

**details**

Optional, kind-specific.

object

**_key_**

additional properties

any

**requestId**

required

Server-assigned request id; also echoed via `X-Request-Id` header.

string

##### Examplegenerated

```json
{
  "error": {
    "code": "example",
    "message": "example",
    "details": {},
    "requestId": "example"
  }
}
```

### 404

No membership for that (project, user) pair, or no such project under this tenant.

application/json

object

**error**

required

object

**code**

required

Stable machine-readable discriminant. Values match domain error codes (see `docs/API-ROUTE-CONVENTIONS.md` §4.3).

string

**message**

required

string

**details**

Optional, kind-specific.

object

**_key_**

additional properties

any

**requestId**

required

Server-assigned request id; also echoed via `X-Request-Id` header.

string

##### Examplegenerated

```json
{
  "error": {
    "code": "example",
    "message": "example",
    "details": {},
    "requestId": "example"
  }
}
```

### 409

Idempotency-Key was reused with a different body, or resource-state conflict.

application/json

object

**error**

required

object

**code**

required

Stable machine-readable discriminant. Values match domain error codes (see `docs/API-ROUTE-CONVENTIONS.md` §4.3).

string

**message**

required

string

**details**

Optional, kind-specific.

object

**_key_**

additional properties

any

**requestId**

required

Server-assigned request id; also echoed via `X-Request-Id` header.

string

##### Examplegenerated

```json
{
  "error": {
    "code": "example",
    "message": "example",
    "details": {},
    "requestId": "example"
  }
}
```

### 413

The request body is over the API’s limit (`request-too-large`; `details.maxBytes` says how much).

application/json

object

**error**

required

object

**code**

required

Stable machine-readable discriminant. Values match domain error codes (see `docs/API-ROUTE-CONVENTIONS.md` §4.3).

string

**message**

required

string

**details**

Optional, kind-specific.

object

**_key_**

additional properties

any

**requestId**

required

Server-assigned request id; also echoed via `X-Request-Id` header.

string

##### Examplegenerated

```json
{
  "error": {
    "code": "example",
    "message": "example",
    "details": {},
    "requestId": "example"
  }
}
```

### 500

Server error (unmapped domain code or framework crash).

application/json

object

**error**

required

object

**code**

required

Stable machine-readable discriminant. Values match domain error codes (see `docs/API-ROUTE-CONVENTIONS.md` §4.3).

string

**message**

required

string

**details**

Optional, kind-specific.

object

**_key_**

additional properties

any

**requestId**

required

Server-assigned request id; also echoed via `X-Request-Id` header.

string

##### Examplegenerated

```json
{
  "error": {
    "code": "example",
    "message": "example",
    "details": {},
    "requestId": "example"
  }
}
```

### 501

With authorization enforced, a runtime whose tenant-hierarchy binding can’t change the membership together with its authorization tuple refuses with `authz-membership-unsupported`; nothing is changed.

application/json

object

**error**

required

object

**code**

required

Stable machine-readable discriminant. Values match domain error codes (see `docs/API-ROUTE-CONVENTIONS.md` §4.3).

string

**message**

required

string

**details**

Optional, kind-specific.

object

**_key_**

additional properties

any

**requestId**

required

Server-assigned request id; also echoed via `X-Request-Id` header.

string

##### Examplegenerated

```json
{
  "error": {
    "code": "example",
    "message": "example",
    "details": {},
    "requestId": "example"
  }
}
```

## See also

- [`DELETE /v1/projects/{projectId}/memberships/{userId}`: Remove a user from a project (idempotent)](https://docs.kindgi.com/v0.1.10/reference/api/operations/projectsmembershipsremove.md)
- [`GET /v1/projects/{projectId}`: Fetch a project by id](https://docs.kindgi.com/v0.1.10/reference/api/operations/projectsget.md)
- [`PATCH /v1/projects/{projectId}`: Partially update a project](https://docs.kindgi.com/v0.1.10/reference/api/operations/projectsupdate.md)
- [`DELETE /v1/projects/{projectId}`: Delete a project (idempotent)](https://docs.kindgi.com/v0.1.10/reference/api/operations/projectsdelete.md)
- [Error code `authz-membership-unsupported`](https://docs.kindgi.com/v0.1.10/reference/errors.md#authz-membership-unsupported)
- [Error code `request-too-large`](https://docs.kindgi.com/v0.1.10/reference/errors.md#request-too-large)
- [Error code `site-person-grants-managed`](https://docs.kindgi.com/v0.1.10/reference/errors.md#site-person-grants-managed)
- [Every error code](https://docs.kindgi.com/v0.1.10/reference/errors.md)