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Create asset

Changed on

<Info>This API is in beta. Endpoints, fields, and behavior may still change, so avoid depending on it in production.</Info>

Adds a file that's already online to the app's media library, by its URL. Base44 doesn't download the file. To store a file with Base44, use Upload asset instead.

In this response, created_date and updated_date include a +00:00 offset. List assets returns them without one.

This endpoint is limited to 120 requests per minute, shared with Create asset, Rename asset and Delete asset. Some workspaces have a different limit.

<Note>This endpoint accepts a personal API key belonging to a user with editor access to the app. A read-only key is refused, and workspace API keys are not accepted.</Note>

<Warning>The response includes fields beyond the ones documented here. Don't rely on undocumented response fields, as they can change at any time. Send only the fields documented here. Other request fields are not supported and their behavior can change.</Warning>

post/api/apps/{app_id}/assets

Request

  • Base URL: https://app.base44.com
  • URL: https://app.base44.com/api/apps/{app_id}/assets
  • Auth: HTTP bearer

Path parameters

app_idstring required

ID of the app whose media library to change.

Request body

file_namestring required

Name of the file. Characters other than letters, digits, _, . and - become _, anything up to the last / is dropped, and an empty name becomes untitled.

file_urlstring required

Public http or https URL of the file. Base44 doesn't download or copy it, so the asset stays a link to this URL. Addresses on private networks and Base44's own hosts, other than its media CDN, are refused.

source_type'upload' | 'generated'

How the file got into the library, upload or generated. Defaults to upload.

file_typestring nullable

File extension without the dot, such as png. Stored as you send it, and used by the file_type filter in List assets. Leave it out to store null.

Example request

{
  "file_name": "Logo-dark.png",
  "file_url": "https://media.base44.com/files/public/6820f3a4e7b91d003c45a1f2/Logo-dark.png",
  "source_type": "upload",
  "file_type": "png"
}

Response

The new asset.

idstring required

ID of the asset.

app_idstring required

ID of the app the asset belongs to.

file_namestring required

Name of the file.

file_urlstring required

URL of the file.

source_type'upload' | 'generated' required

How the file got into the library. upload for a file someone uploaded, and generated for most files Base44 created for the app, such as AI-generated images and videos or a Figma import.

file_typestring nullable required

File extension without the dot, usually lowercase, such as png or mp4. The value is null when the file was added without one.

created_datestring required

When the asset was added to the library, as a UTC timestamp in ISO 8601 format.

updated_datestring required

When the asset was last changed, such as renamed, as a UTC timestamp in ISO 8601 format.

Example response

{
  "id": "68b0e1f2a3c4d5e6f7a8b9c0",
  "app_id": "6820f3a4e7b91d003c45a1f2",
  "file_name": "Logo-dark.png",
  "file_url": "https://media.base44.com/files/public/6820f3a4e7b91d003c45a1f2/Logo-dark.png",
  "source_type": "upload",
  "file_type": "png",
  "created_date": "2026-01-15T09:23:41",
  "updated_date": "2026-01-15T09:31:07"
}

Changes