---
title: File object | RunAPI
description: An immutable persistent File identified by a RunAPI File ID without storage
  implementation details.
url: https://runapi.ai/docs/api/protocol/files/object.md
canonical: https://runapi.ai/docs/api/protocol/files/object
locale: en
---

> HTML version: https://runapi.ai/docs/api/protocol/files/object
> Site index for agents: https://runapi.ai/llms.txt

# File object

An immutable persistent File identified by a RunAPI File ID without storage implementation details.

## Object fields

Stable fields shared by the resource's reusable object.

### Persistent Files

```json
{
  "bytes": {
    "description": "Stored File size in bytes.",
    "required": true,
    "type": "integer"
  },
  "created_at": {
    "description": "Unix timestamp when the File was created.",
    "required": true,
    "type": "integer"
  },
  "expires_at": {
    "description": "Optional Unix timestamp when the File expires.",
    "required": false,
    "type": "integer"
  },
  "filename": {
    "description": "Original File name.",
    "required": true,
    "type": "string"
  },
  "id": {
    "description": "RunAPI File ID.",
    "required": true,
    "type": "string"
  },
  "object": {
    "description": "Object type.",
    "required": true,
    "type": "string"
  },
  "purpose": {
    "description": "File purpose.",
    "enum": [
      "user_data",
      "batch",
      "batch_output"
    ],
    "required": true,
    "type": "string"
  }
}
```

## Related reference

- [Persistent Files](https://runapi.ai/docs/api/protocol/files.md)
- [Create a File](https://runapi.ai/docs/api/protocol/files/create.md)
- [List Files](https://runapi.ai/docs/api/protocol/files/list.md)
- [Retrieve a File](https://runapi.ai/docs/api/protocol/files/retrieve.md)
- [Retrieve File content](https://runapi.ai/docs/api/protocol/files/content.md)
- [Delete a File](https://runapi.ai/docs/api/protocol/files/delete.md)

---

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## Structured data

```json
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