> For the complete documentation index, see [llms.txt](https://docs.flora.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flora.ai/api/reference/assets/reserveassetuploads.md).

# Reserve signed uploads in bulk

Reserve signed uploads in bulk with the FLORA API: POST /assets/reserve.

Reserves up to 25 signed uploads in one request — the batch counterpart of POST /assets with source="signed-url", counted once against the workspace's rate limit instead of once per file. workspace\_id, project\_id and folder apply to every upload; an upload's own folder overrides the shared one. Each entry in assets echoes its index and carries either the single reservation's fields (asset\_id, upload, upload\_url, expires\_at, url) or ok false with an error; a failed entry, such as an unsupported content\_type, never stops the rest. A workspace this credential cannot write, or a project\_id outside the workspace, fails the whole request. Upload each file's bytes with its upload descriptor, then finish them in one call with POST /assets/complete. As on the single reservation, project\_id places each asset on the canvas when it completes. Mutating public API requests support an optional Idempotency-Key header for client retries; duplicate keys within two hours return idempotency\_duplicate, and a batch whose every entry was rejected releases its key (see the Idempotency guide).

```http
POST https://app.flora.ai/api/v1/assets/reserve
```

* **Auth:** API key as a bearer token, `Authorization: Bearer $FLORA_API_KEY`. See [Authentication](/api/platform/authentication.md).
* **TypeScript SDK:** `client.assets.reserveUploads()`.
* **Idempotency:** optional `Idempotency-Key` header. See [Idempotency](/api/platform/idempotency.md).
* **Operation ID:** `reserveAssetUploads`.

## Example

{% tabs %}
{% tab title="cURL" %}

```bash
curl -X POST 'https://app.flora.ai/api/v1/assets/reserve' \
  -H "Authorization: Bearer $FLORA_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "workspace_id": "ws_abc123",
  "uploads": [
    {
      "file_name": "hero.png",
      "content_type": "image/png",
      "folder": "campaign-assets"
    }
  ]
}'
```

{% endtab %}

{% tab title="TypeScript SDK" %}

```typescript
import { FloraClient } from '@flora-ai/flora';

const client = new FloraClient({ apiKey: process.env['FLORA_API_KEY'] });

const asset = await client.assets.reserveUploads({
  workspace_id: 'ws_abc123',
  uploads: [
    {
      file_name: 'hero.png',
      content_type: 'image/png',
      folder: 'campaign-assets',
    },
  ],
});
console.log(asset);
```

{% endtab %}
{% endtabs %}

## Request body

Required.

| Field                    | Type             | Required | Description                                                                                                                                                                                                                       |
| ------------------------ | ---------------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `workspace_id`           | string           | Yes      | Workspace identifier. Use the public API ID returned by list workspaces; it must start with ws\_. Pattern: `^ws_\S+$`. Example: `ws_abc123`.                                                                                      |
| `project_id`             | string           | No       | Project identifier. Use the public API ID returned by list projects; it must start with prj\_. Every upload is reserved against this project and lands on its canvas once completed. Pattern: `^prj_\S+$`. Example: `prj_abc123`. |
| `folder`                 | string           | No       | Destination folder for uploads that set none. Example: `campaign-assets`.                                                                                                                                                         |
| `uploads`                | array of objects | Yes      | Uploads to reserve, 1 to 25 per call. 1 to 25 items.                                                                                                                                                                              |
| `uploads[].file_name`    | string           | No       | Asset file name. Example: `hero.png`.                                                                                                                                                                                             |
| `uploads[].content_type` | string           | No       | Asset content type, pinned in this upload's policy. Example: `image/png`.                                                                                                                                                         |
| `uploads[].folder`       | string           | No       | Destination folder for this upload. Example: `campaign-assets`.                                                                                                                                                                   |

## Responses

### 200: Uploads reserved; each entry reports its own outcome.

| Field    | Type             | Required | Description                                                                                                                                                                |
| -------- | ---------------- | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `assets` | array of objects | Yes      | One entry per requested upload, in request order: ok true with the single reservation's fields, or ok false with error. At most 25 items. See the `assets[]` shapes below. |

<details>

<summary>assets[] shapes</summary>

Field paths in this block are relative to `assets[]`.

`assets[]` takes one of 2 shapes, set by `ok`.

**Shape 1: `ok` is `true`.**

| Field                 | Type               | Required | Description                                                                           |
| --------------------- | ------------------ | -------- | ------------------------------------------------------------------------------------- |
| `asset_id`            | string             | Yes      | Asset identifier. Pattern: `^asset_\S+$`. Example: `asset_abc123`.                    |
| `uploaded_via`        | string             | Yes      | Always `signed_url`.                                                                  |
| `url`                 | string (uri)       | Yes      | Asset URL                                                                             |
| `workspace_id`        | string             | Yes      | Workspace identifier. Pattern: `^ws_\S+$`. Example: `ws_abc123`.                      |
| `visibility`          | string             | Yes      | Always `workspace`.                                                                   |
| `status`              | string             | Yes      | One of: `pending_upload`, `ready`, `failed`.                                          |
| `upload`              | object             | Yes      |                                                                                       |
| `upload.url`          | string (uri)       | Yes      | Upload URL                                                                            |
| `upload.method`       | string             | Yes      | Always `POST`.                                                                        |
| `upload.content_type` | string             | Yes      | Always `multipart/form-data`.                                                         |
| `upload.file_field`   | string             | Yes      | Always `file`.                                                                        |
| `upload.form_fields`  | map of string      | Yes      | Upload form fields                                                                    |
| `upload_url`          | string             | Yes      | Upload URL (serialized). Example: `https://storage.googleapis.com/flora-user-assets`. |
| `expires_at`          | string (date-time) | Yes      | Expiration time for the upload URL                                                    |
| `index`               | integer            | Yes      | Position of this entry in the request's list. At least 0.                             |
| `ok`                  | boolean            | Yes      | This upload was reserved. Always `true`.                                              |

**Shape 2: `ok` is `false`.**

| Field           | Type    | Required | Description                                                                                                     |
| --------------- | ------- | -------- | --------------------------------------------------------------------------------------------------------------- |
| `index`         | integer | Yes      | Position of this entry in the request's list. At least 0.                                                       |
| `ok`            | boolean | Yes      | This entry failed; error says why. Always `false`.                                                              |
| `error`         | object  | Yes      | Why this entry failed                                                                                           |
| `error.code`    | string  | Yes      | Stable public API error code, as the single-asset operation would return it. Example: `input_validation_error`. |
| `error.message` | string  | Yes      | Human-readable reason this entry failed                                                                         |

</details>

## Errors

Every error has the same body: `error.code`, `error.message`, and `error.fields` on validation errors. See [Errors](/api/platform/errors.md) for how to recover from each code.

| Status | Code                                         | Meaning                                                                             |
| ------ | -------------------------------------------- | ----------------------------------------------------------------------------------- |
| 400    | `invalid_json`, `input_validation_error`     | The body isn't valid JSON, or an input failed validation (`fields` lists each one). |
| 401    | `unauthorized`, `invalid_api_key`            | The API key is missing, invalid or revoked.                                         |
| 402    | `insufficient_credits`                       | The workspace balance is too low for this request.                                  |
| 403    | `forbidden`, `paid_plan_required`            | The key can't do this, or the workspace plan doesn't include it.                    |
| 404    | `not_found`                                  | The resource doesn't exist or isn't visible to this key.                            |
| 409    | `idempotency_duplicate`, `revision_conflict` | Duplicate `Idempotency-Key` or a stale `base_revision`.                             |
| 429    | `rate_limited`                               | Too many requests. Back off and retry.                                              |
| 500    | `unknown_error`, `internal_error`            | Something failed on FLORA's side. Retry with backoff.                               |
| 503    | `temporarily_unavailable`                    | Authorization is temporarily unavailable. Retry later.                              |


---

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