# Set a metafield
> Store a metafield value on an owner record.
{/* generated:versioned-pages - edit _pm-authored, not this file */}
`POST /api/{ownerResource}/{ownerId}/metafields`
Creates a Metafield resource.
Stores a metafield value on the owner record identified by `ownerResource` and `ownerId`. Reference the [definition](/api/product-management/metafield-definitions/) the value belongs to and give it a `value` - it is validated against the definition's `type` and `validations`.
## Headers
| Name | Type | Required | Description |
| ----------------- | -------- | -------- | ---------------------------------------------------------------------------------------------------------------- |
| `Flowkiwi-Locale` | `string` | - | Specifies the locale for properties that support localization. If not provided, the default locale will be used. |
## Path parameters
| Name | Type | Required | Description |
| --------------- | -------- | -------- | -------------------------------------------------------------------------------------------------------------------------- |
| `ownerResource` | `string` | Yes | The owner resource type the metafields are scoped to (e.g. "products", "variants"); must match the definition's ownerType. |
| `ownerId` | `string` | Yes | The id of the owner record the metafields belong to. |
## Request body
| Property | Type | Required | Description |
| ------------ | ---------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| `definition` | `string` | Yes | The `MetafieldDefinition` this metafield is an instance of. Requires the `metafields:read` scope. Returned null when the scope is missing. |
| `value` | `string \| null` | Yes | |
## Response
**201** - Metafield resource created
| Property | Type | Required | Description |
| --------------- | ------------------ | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `@context` | `string \| object` | - | |
| `@id` | `string` | Yes | |
| `@type` | `string` | Yes | |
| `createdAt` | `string` | - | The date and time when the resource was created (ISO 8601 format). |
| `definition` | `string \| null` | - | The `MetafieldDefinition` this metafield is an instance of. Requires the `metafields:read` scope. Returned null when the scope is missing. |
| `id` | `string` | - | The resource's unique identifier (UUID). |
| `metaobject` | `array` | - | The referenced metaobject(s). Populated when ?expand=metaobject is requested and the field type is metaobject_reference or list__metaobject_reference. Requires the `metaobjects:read` scope. Returned empty when the scope is missing. |
| `ownerId` | `string \| null` | - | The id of the owner record the metafield is attached to. |
| `ownerResource` | `string` | Yes | The type of resource that the metafield is attached to. |
| `updatedAt` | `string` | - | The date and time when the resource was last modified (ISO 8601 format). |
| `value` | `string` | - | **This property supports translations.**
The data stored in the metafield. Always stored as a string, regardless of the metafield's type. |
## Errors
**400** - Invalid input
| Property | Type | Required | Description |
| ------------- | ------------------ | -------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| `@context` | `string \| object` | - | |
| `@id` | `string` | Yes | |
| `@type` | `string` | Yes | |
| `code` | `string` | - | Stable identifier of the error in the error code catalogue (see /api/error-codes). Present on catalogued errors only. |
| `description` | `string \| null` | - | |
| `detail` | `string \| null` | - | A human-readable explanation specific to this occurrence of the problem. |
| `instance` | `string \| null` | - | A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced. |
| `message` | `string` | - | End-user message localized in the request locale, with this occurrence's values substituted. Present on catalogued errors only. |
| `slug` | `string` | - | Stable, readable key of the error in the error code catalogue. Present on catalogued errors only. |
| `status` | `integer \| null` | - | |
| `title` | `string \| null` | - | A short, human-readable summary of the problem. For a catalogued error it repeats the `slug`. |
| `type` | `string` | - | A URI reference that identifies the problem type. For a catalogued error it is the error code resource, `/api/error-codes/{code}`. |
**403** - Access denied. The caller is missing one or more permissions required for this operation.
| Property | Type | Required | Description |
| -------------------- | ------------------ | -------- | ---------------------------------------------------------------------------------------------------------------------- |
| `@context` | `string \| object` | - | |
| `@id` | `string` | Yes | |
| `@type` | `string` | Yes | |
| `detail` | `string` | - | |
| `missingPermissions` | `string[]` | - | Permissions that the caller is missing for this operation. Present only when the 403 is caused by a denied permission. |
| `status` | `integer` | - | |
| `title` | `string` | - | |
| `type` | `string` | - | |
**422** - An error occurred
| Property | Type | Required | Description |
| ------------- | ------------------ | -------- | ----------- |
| `@context` | `string \| object` | - | |
| `@id` | `string` | Yes | |
| `@type` | `string` | Yes | |
| `description` | `string` | - | |
| `detail` | `string` | - | |
| `instance` | `string \| null` | - | |
| `status` | `integer` | - | |
| `title` | `string \| null` | - | |
| `type` | `string` | - | |
| `violations` | `object[]` | - | |
## Examples
### Example request
```bash
curl -X POST 'https://.product-management.flowkiwi.net/api/{ownerResource}/{ownerId}/metafields' \
-H 'Authorization: Bearer {access_token}' \
-H 'Flowkiwi-Api-Version: unstable' \
-H 'Accept: application/ld+json' \
-H 'Content-Type: application/ld+json' \
-d '{
"definition": "/api/metafield_definitions/019afb01-1a2b-7c3d-8e4f-0a1b2c3d4e5f",
"value": "Machine wash cold at 30°C"
}'
```
### Example response
```json
{
"@context": "/api/contexts/Metafield",
"@id": "/api/products/019af93e-420e-79f8-800b-6680f03dce20/metafields/019afb02-2b3c-7d4e-9f50-1a2b3c4d5e6f",
"@type": "Metafield",
"createdAt": "2026-01-15T09:30:00+00:00",
"definition": "/api/metafield_definitions/019afb01-1a2b-7c3d-8e4f-0a1b2c3d4e5f",
"id": "019afb02-2b3c-7d4e-9f50-1a2b3c4d5e6f",
"metaobject": [],
"ownerId": "019af93e-420e-79f8-800b-6680f03dce20",
"ownerResource": "products",
"updatedAt": "2026-02-03T14:45:12+00:00",
"value": "Machine wash cold at 30°C"
}
```