# Retrieve a metafield definition

> Retrieve a metafield definition by its identifier.
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`GET /api/metafield_definitions/{id}`

Retrieves a MetafieldDefinition resource.

Returns a single metafield definition by id, including its `type`, `validations`, `constraints` and `metafieldsCount`.

## Path parameters

| Name | Type     | Required | Description                    |
| ---- | -------- | -------- | ------------------------------ |
| `id` | `string` | Yes      | MetafieldDefinition identifier |

## Response

**200** - MetafieldDefinition resource

| Property          | Type                                              | Required | Description                                                                                         |
| ----------------- | ------------------------------------------------- | -------- | --------------------------------------------------------------------------------------------------- |
| `@context`        | `object`                                          | -        |                                                                                                     |
| `@id`             | `string`                                          | Yes      |                                                                                                     |
| `@type`           | `string`                                          | Yes      |                                                                                                     |
| `id`              | `string`                                          | -        | The resource's unique identifier (UUID).                                                            |
| `name`            | `string`                                          | -        | The human-readable name of the metafield definition.                                                |
| `description`     | `string \| null`                                  | -        | The description of the metafield definition.                                                        |
| `namespace`       | `string`                                          | -        | The container for a group of metafields that the metafield definition is associated with.           |
| `key`             | `string`                                          | -        | The unique identifier for the metafield definition within its namespace.                            |
| `ownerType`       | `string`                                          | Yes      | The resource type that the metafield definition is attached to.                                     |
| `type`            | `string`                                          | Yes      | The type of data that each of the metafields that belong to the metafield definition will store.    |
| `createdAt`       | `string`                                          | -        | The date and time when the resource was created (ISO 8601 format).                                  |
| `updatedAt`       | `string`                                          | -        | The date and time when the resource was last modified (ISO 8601 format).                            |
| `validations`     | `EmbeddedMetafieldDefinitionValidationResource[]` | -        | The validation rules applied to the values of metafields using this definition.                     |
| `constraints`     | `EmbeddedMetafieldDefinitionConstraintResource[]` | -        | The constraint rules scoping where this metafield definition applies (e.g. by category or channel). |
| `metafieldsCount` | `integer`                                         | -        | The count of the metafields that belong to the metafield definition.                                |

## Errors

**403** - Access denied. The caller is missing one or more identity permissions required for this operation.

| Property             | Type       | Required | Description                                                                                                                                |
| -------------------- | ---------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| `@context`           | `object`   | -        |                                                                                                                                            |
| `@id`                | `string`   | Yes      |                                                                                                                                            |
| `@type`              | `string`   | Yes      |                                                                                                                                            |
| `type`               | `string`   | -        |                                                                                                                                            |
| `title`              | `string`   | -        |                                                                                                                                            |
| `status`             | `integer`  | -        |                                                                                                                                            |
| `detail`             | `string`   | -        |                                                                                                                                            |
| `missingPermissions` | `string[]` | -        | Identity permissions that the caller is missing for this operation. Present only when the 403 is caused by a denied identity:* permission. |

**404** - Not found

| Property      | Type              | Required | Description                                                                                                                          |
| ------------- | ----------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| `@context`    | `object`          | -        |                                                                                                                                      |
| `@id`         | `string`          | Yes      |                                                                                                                                      |
| `@type`       | `string`          | Yes      |                                                                                                                                      |
| `title`       | `string \| null`  | -        | A short, human-readable summary of the problem.                                                                                      |
| `detail`      | `string \| null`  | -        | A human-readable explanation specific to this occurrence of the problem.                                                             |
| `status`      | `integer \| null` | -        |                                                                                                                                      |
| `instance`    | `string \| null`  | -        | A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced. |
| `type`        | `string`          | -        | A URI reference that identifies the problem type                                                                                     |
| `description` | `string \| null`  | -        |                                                                                                                                      |

## Examples

### Example request

```bash
curl -X GET 'https://<tenant>.product-management.flowkiwi.net/api/metafield_definitions/<product_id>' \
  -H 'Authorization: Bearer {access_token}' \
  -H 'Flowkiwi-Api-Version: 2026-07' \
  -H 'Accept: application/ld+json'
```

### Example response

```json
{
  "@context": "/api/contexts/MetafieldDefinition",
  "@id": "/api/metafield_definitions/019afb01-1a2b-7c3d-8e4f-0a1b2c3d4e5f",
  "@type": "MetafieldDefinition",
  "id": "019afb01-1a2b-7c3d-8e4f-0a1b2c3d4e5f",
  "name": "Care instructions",
  "description": "Washing and care guidance shown on the product page.",
  "namespace": "custom",
  "key": "care_instructions",
  "ownerType": "/api/metafield_owner_types/products",
  "type": "/api/metafield_definition_types/multi_line_text_field",
  "validations": [
    {
      "name": "/api/metafield_definition_validation_types/max_length",
      "value": "500"
    }
  ],
  "constraints": [],
  "metafieldsCount": 1,
  "createdAt": "2026-01-15T09:30:00+00:00",
  "updatedAt": "2026-02-03T14:45:12+00:00"
}
```