# Variant routes: create, get, list

URL: /code/api/variant/records · Id: `page:code/api/variant/records`

> The Variant Verbs create, get, list as api.sb routes, with inputs, result, refusals and an example.

Reference for [Variant](/business/nouns/variant), one group of [Variant routes](/code/api/variant).

### Variant.create
Creates a Variant. [Verb page](/business/nouns/variant/create?interface=api).

```text
POST /{namespace}/variants
```

Body, as JSON: the inputs. Emits `Variant.created`.

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `key` | `string` | Yes | The name the Flag returns for it. |
| `value` | `json` | Yes | What it changes: copy, behavior, a definition Version, or a Thing. |
| `control` | `boolean` | No | True for the current definition every challenger is judged against. |
| `follows` | [Variant](/business/nouns/variant) | No | The Variant it was drafted from by a learn step. |
| `experiment` | [Experiment](/business/nouns/experiment) | No | The Variants the Experiment can assign, the control among them. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `variant` | [Variant](/business/nouns/variant) | Yes | The Variant. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |

**Example**

```bash
curl -X POST https://api.sb/leaseline.app/variants \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"key":"Example key","value":{}}'
```

```json
{
  "api": "https://api.sb/leaseline.app",
  "variant": {
    "$id": "https://api.sb/leaseline.app/variants/variant_nvdfmt7dTw",
    "$type": "Variant",
    "key": "Example key",
    "value": {}
  },
  "action": {
    "$id": "https://api.sb/leaseline.app/actions/act_br07HsG8MG",
    "operation": "Variant.create",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/leaseline.app/actions/act_br07HsG8MG"
  }
}
```

### Variant.get
Returns one Variant by id. [Verb page](/business/nouns/variant/get?interface=api).

```text
GET /{namespace}/variants/{id}
```

Path: `id`. Query: the other inputs. Reads only: it emits no Event.

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `id` | `string` | Yes | The id of the Variant. |
| `at` | `string` | No | A time or Version name: the record as it stood then. Unset: as it stands now. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `variant` | [Variant](/business/nouns/variant) | Yes | The Variant. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |

**Example**

```bash
curl https://api.sb/leaseline.app/variants/variant_nvdfmt7dTw \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY"
```

```json
{
  "api": "https://api.sb/leaseline.app",
  "$type": "Variant",
  "$id": "https://api.sb/leaseline.app/variants/variant_nvdfmt7dTw",
  "variant": {
    "$id": "https://api.sb/leaseline.app/variants/variant_nvdfmt7dTw",
    "$type": "Variant",
    "key": "Example key",
    "value": {}
  },
  "links": {
    "self": "https://api.sb/leaseline.app/variants/variant_nvdfmt7dTw",
    "up": "https://api.sb/leaseline.app/variants"
  }
}
```

### Variant.list
Returns Variants, newest first, one page at a time. [Verb page](/business/nouns/variant/list?interface=api).

```text
GET /{namespace}/variants
```

Query: the inputs. Reads only: it emits no Event.

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `limit` | `integer` | No | At most this many records, up to 100. The default is 20. |
| `after` | `string` | No | The cursor from the previous page. |
| `where` | `string` | No | A filter over the properties, such as `paidAt = null and total.amount > 500`. |
| `sort` | `string` | No | Properties to sort by, comma-separated; a leading minus sorts descending. |
| `total` | `boolean` | No | True adds the match count as `meta.total`, exact up to 10,000 matches and estimated above. |
| `facets` | `string` | No | Properties to count by value, comma-separated, returned as `meta.facets`. |
| `fields` | `string` | No | Properties to return on each record, comma-separated; `$id` and `$type` always return. |
| `include` | `string` | No | Related records to embed in place of their URLs, comma-separated. |
| `depth` | `integer` | No | How many levels of related records to embed. The default is 1. |
| `q` | `string` | No | Words to match across the text properties, ranked by relevance. |
| `match` | `string` | No | Ranks the search by `words`, or `meaning`; words is the default. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `variants` | list of [Variant](/business/nouns/variant) | Yes | One page of Variants. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |

**Example**

```bash
curl "https://api.sb/leaseline.app/variants?limit=20" \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY"
```

```json
{
  "api": "https://api.sb/leaseline.app",
  "$type": "Variant",
  "variants": [
    {
      "$id": "https://api.sb/leaseline.app/variants/variant_nvdfmt7dTw",
      "$type": "Variant",
      "key": "Example key",
      "value": {}
    }
  ],
  "meta": {
    "limit": 20,
    "after": "variant_nvdfmt7dTw"
  },
  "links": {
    "self": "https://api.sb/leaseline.app/variants?limit=20",
    "next": "https://api.sb/leaseline.app/variants?after=variant_nvdfmt7dTw"
  }
}
```