Save several app files

Changed on Oct 12, 2026

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

Saves several files into the app in one call, the way the app editor does.

Send up to 50 files. Every path is validated before anything is written, so one bad path fails the whole batch with a 400 and leaves the app untouched. An empty files list is a 400 rather than a no-op.

This route never deploys, so it refuses backend code: a path under functions/ answers 422 rather than writing source that the live function wouldn't match. Use Save an app file for those, one at a time, and this one for the frontend files a visual edit touches.

Internally this route can follow a feature branch, but the parameter that selects one isn't part of the public API, so writes through this endpoint land on the app's main line.

The response is the app document as it stands after the change, the same shape Get app returns.

<Note>This endpoint accepts a personal API key. Workspace API keys are not authorized for it and are rejected with a 403.</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}/coding/write-batch

Request

Base URL: https://app.base44.com
URL: https://app.base44.com/api/apps/{app_id}/coding/write-batch
Auth: HTTP bearer

Path parameters

app_idstring required

ID of the app whose code to change.

Request body

Example request

{
  "files": [
    {
      "content": "export default function About() {\n  return <h1>About</h1>;\n}\n",
      "file_path": "src/pages/About.jsx"
    },
    {
      "content": "export default function Home() {\n  return <h1>Home</h1>;\n}\n",
      "file_path": "src/pages/Home.jsx"
    }
  ]
}

Response

The app after the writes.

idstring

ID of the app.

created_datestring date-time

Time the app was created, as a UTC timestamp in ISO 8601 format.

updated_datestring date-time

Time the app document was last written, as a UTC timestamp in ISO 8601 format.

created_bystring nullable

Email of the user who created the app.

organization_idstring nullable

ID of the workspace the app belongs to.

app_typestring

Kind of app, set when it's created. One of user_app (a web app), user_agent (an AI agent), mobile_app (a native mobile app), user_game (a game), slide (a presentation), or imported_app (an app imported from an existing code repository). List apps returns it as stored, so an older agent app can report agent instead of user_agent, and some older apps don't include it. Get app always returns one of the values above.

namestring

Display name of the app.

user_descriptionstring nullable

Description of the app, or null if none was set. An app created without a name gets a generated description once a build turn changes it.

logo_urlstring nullable

URL of the app's logo, or null if it has none. Set it with Set app logo or Generate app logo.

social_image_urlstring nullable

URL of the image shown when the app is shared on social platforms, or null if none was set, in which case the logo is shown instead. Set it with Set social image.

public_settings'private_with_login' | 'public_with_login' | 'public_without_login' | 'workspace_with_login'

Who can open the published app. Each value is described under Update app, which also changes it.

hide_entity_created_byboolean

Whether the app's entity records leave out the email of the user who created each one (created_by). Newer apps always leave the email out, whatever this is set to.

is_remixableboolean

Whether others can remix the app. While it's true, the published app also shows the Base44 badge if public_settings is public_with_login or public_without_login.

main_branch_protectedboolean

Whether the app's main branch is protected, so changes to main must go through a branch that's merged back. Always true for imported apps. Change it with Set main branch protection.

slugstring nullable

URL slug for the app, auto generated from the name and app ID or set to a custom value, or null if the app has no slug yet. The published URL is built from it.

is_unpublishedboolean

Whether the app was taken offline with Unpublish app and hasn't been published again since. While it's true, the published URL is offline and last_deployed_at still shows the last publish.

last_deployed_atstring date-time nullable

Time the app was last published, as a UTC timestamp in ISO 8601 format, or null if it has never been published.

screenshot_urlstring nullable

URL of a screenshot of the published app. Captured shortly after each publish, so it can briefly lag or be null right after publishing.

preview_screenshot_urlstring nullable

URL of a preview screenshot taken before publishing, distinct from screenshot_url, or null if none has been captured.

owner_idstring nullable

ID of the user who owns the app. It starts as the creator and changes when ownership is transferred.

dev_environment_enabledboolean

Whether test data is on, which gives the app a test database next to its live one.

Example response

{
  "id": "6820f3a4e7b91d003c45a1f2",
  "created_date": "2026-08-01T09:15:00",
  "updated_date": "2026-08-02T14:30:00",
  "created_by": "developer@example.com",
  "organization_id": "67e0b12c4d8a3f005b21c9e4",
  "app_type": "user_app",
  "name": "My CRM",
  "user_description": "A CRM to track leads and deals",
  "logo_url": "https://storage.base44.com/6820f3a4e7b91d003c45a1f2/3f2504e0_logo.png",
  "social_image_url": "https://storage.base44.com/6820f3a4e7b91d003c45a1f2/7c9e6679_social.png",
  "public_settings": "public_with_login",
  "auth_config": {
    "enable_username_password": true,
    "enable_google_login": true
  },
  "hide_entity_created_by": true,
  "slug": "my-crm-3c45a1f2",
  "last_deployed_at": "2026-08-02T14:30:00",
  "screenshot_url": "https://storage.base44.com/screenshots/6820f3a4e7b91d003c45a1f2.png",
  "preview_screenshot_url": "https://storage.base44.com/previews/6820f3a4e7b91d003c45a1f2.png",
  "owner_id": "6706af53b9c1e2004a37d85f",
  "status": {
    "state": "ready",
    "details": "Publishing app",
    "request_id": "a1b2c3d4e5f67890abcdef12",
    "last_updated_date": "2026-08-02T14:30:00Z",
    "error_source": "build",
    "paywall_context": {
      "billing_organization_id": "67e0b12c4d8a3f005b21c9e4",
      "user_id": "6706af53b9c1e2004a37d85f",
      "evaluated_at": "2026-08-02T14:30:00Z"
    }
  }
}

Changes

Oct 12, 20265e139db2e643 Revision changes
- info
  the endpoint scheme security PersonalAccessTokenAuth was added to the API
Oct 9, 2026fc604cdcc3a2 Revision changes
- breaking
  the response's property type changed from no type to object for status
- breaking
  the response's property type changed from no type to object for status
- warning
  added the new private_with_login enum value to the response property for the response status
- warning
  added the new public_with_login enum value to the response property for the response status
- warning
  added the new public_without_login enum value to the response property for the response status
- warning
  added the new workspace_with_login enum value to the response property for the response status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  added the optional property / to the response with the status
- info
  removed subschema #2 from the response property anyOf list for the response status
- info
  removed subschema #2 from the response property anyOf list for the response status
- info
  the response's property default value user_app was added for the status
- info
  the response's property default value false was added for the status
- info
  the response's property default value false was added for the status
- info
  the response's property default value false was added for the status
- info
  the response's property default value false was added for the status
- info
  the response's property default value false was added for the status
- info
  the response's property default value untitled was added for the status
- info
  the response's property default value public_with_login was added for the status
- info
  response property app_type list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property created_date list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property dev_environment_enabled list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property hide_entity_created_by list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property id list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property is_remixable list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property is_unpublished list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property main_branch_protected list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property name list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property public_settings list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  response property updated_date list-of-types was narrowed by removing types null from media type application/json of response 200
- info
  added the required property / to the response with the status

Operation history (7 revisions)