> ## Documentation Index > Fetch the complete documentation index at: https://docs.base44.com/llms.txt > Use this file to discover all available pages before exploring further. # Redeploy a backend function > This API is in beta. Endpoints, fields, and behavior may still change, so avoid depending on it in production. Deploys the code you send as one of the app's backend functions and saves it as that function's source, the same way **Save & Redeploy** does in the app editor. The function is deployed from the `code` in the request, not from the source already stored in the app. To redeploy a function unchanged, send its current source. The deploy runs even when the code is identical, which is how you recover a function whose deployment is missing or out of date. A name that no function has yet creates a new function. The request waits for the deploy to finish, and fails with the compiler's diagnostics when the code doesn't build. An app runs one deploy at a time. If another deploy for the app is still running after a short wait, the call is rejected and is safe to retry. Backend functions need a Builder plan or higher on the app's workspace. If the app has no backend functions yet, the first redeploy sets them up. The deploy always lands on the app's main line, and is rejected while main is protected. Naming a branch in `branch_id` returns a 409. To deploy a function on a branch, use [Save an app file](/api-reference/save-an-app-file) with that `branch_id`. The published app keeps running the previous version of the function until you publish the app again. Automations and workflows run the redeployed version right away. This is limited to 50 requests a minute per caller for each app. Some workspaces have a different limit. The response is the app document as it stands after the change, the same shape [Get app](/api-reference/get-app) returns. 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. 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. ## OpenAPI ````yaml /developers/references/app-management/app-management-openapi.json post /api/apps/{app_id}/coding/redeploy-function/{function_name} openapi: 3.1.0 info: title: Base44 App Management API version: 1.0.0 servers: - url: https://app.base44.com security: - PersonalAccessTokenAuth: [] paths: /api/apps/{app_id}/coding/redeploy-function/{function_name}: post: summary: Redeploy a backend function description: >- This API is in beta. Endpoints, fields, and behavior may still change, so avoid depending on it in production. Deploys the code you send as one of the app's backend functions and saves it as that function's source, the same way **Save & Redeploy** does in the app editor. The function is deployed from the `code` in the request, not from the source already stored in the app. To redeploy a function unchanged, send its current source. The deploy runs even when the code is identical, which is how you recover a function whose deployment is missing or out of date. A name that no function has yet creates a new function. The request waits for the deploy to finish, and fails with the compiler's diagnostics when the code doesn't build. An app runs one deploy at a time. If another deploy for the app is still running after a short wait, the call is rejected and is safe to retry. Backend functions need a Builder plan or higher on the app's workspace. If the app has no backend functions yet, the first redeploy sets them up. The deploy always lands on the app's main line, and is rejected while main is protected. Naming a branch in `branch_id` returns a 409. To deploy a function on a branch, use [Save an app file](/api-reference/save-an-app-file) with that `branch_id`. The published app keeps running the previous version of the function until you publish the app again. Automations and workflows run the redeployed version right away. This is limited to 50 requests a minute per caller for each app. Some workspaces have a different limit. The response is the app document as it stands after the change, the same shape [Get app](/api-reference/get-app) returns. 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. 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. operationId: >- redeploy_function_api_apps__app_id__coding_redeploy_function__function_name__post parameters: - name: function_name in: path required: true schema: type: string description: >- Name of the backend function, as a path under `functions/`. Send the bare name, the name with its file extension, or the name followed by `/entry.ts`. Nested functions have slashes in their name, and you send those as they are. title: Function Name description: >- Name of the backend function, as a path under `functions/`. Send the bare name, the name with its file extension, or the name followed by `/entry.ts`. Nested functions have slashes in their name, and you send those as they are. example: sendWelcomeEmail - name: app_id in: path required: true schema: type: string description: ID of the app whose code to change. title: App Id description: ID of the app whose code to change. example: 6820f3a4e7b91d003c45a1f2 - name: branch_id in: query required: false schema: type: string description: >- ID of the branch to work on, as returned by [List branches](/api-reference/list-branches). Omit it to work on the app's main branch. title: Branch Id description: >- ID of the branch to work on, as returned by [List branches](/api-reference/list-branches). Omit it to work on the app's main branch. example: 68f1a2b3c4d5e6f708192a3b requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/RedeployFunctionPayload' responses: '200': description: The app after the deploy. content: application/json: schema: $ref: '#/components/schemas/UserApp' '400': description: >- `function_name` is empty, isn't a valid function name, or points at one of the app's frontend files instead of a backend function. '401': description: Missing or invalid credentials. '403': description: >- You don't have editor access to this app, your API key is read-only, or you used a workspace API key. Backend functions also need a Builder plan or higher on the app's workspace. '404': description: App not found, or no branch you can see has this `branch_id`. '409': description: >- The app's main line is protected, `branch_id` names a branch (`extra_data.reason` is `operation_blocked_on_branch`), the app moved to another workspace during the deploy, or another deploy for the app is still running. '422': description: >- The body has no `code`, or the code was rejected or failed to build. A build failure carries the compiler diagnostics in the detail. '429': description: Too many redeploys for this app from you in the last minute. '503': description: >- `deployment_temporarily_unavailable`: the app's backend functions are being upgraded to a new runtime and the upgrade didn't finish. Nothing was deployed. Retry after a few minutes. content: application/json: schema: $ref: '#/components/schemas/StandardErrorEnvelope' security: - PersonalAccessTokenAuth: - full_access components: schemas: RedeployFunctionPayload: properties: code: type: string title: Code description: Full source of the function to deploy and save. example: | Deno.serve(async (req) => { return Response.json({ ok: true }); }); type: object required: - code title: RedeployFunctionPayload example: code: | Deno.serve(async (req) => { return Response.json({ ok: true }); }); UserApp: properties: id: type: string title: Id description: ID of the app. example: 6820f3a4e7b91d003c45a1f2 created_date: type: string format: date-time title: Created Date description: Time the app was created, as a UTC timestamp in ISO 8601 format. example: '2026-08-01T09:15:00' updated_date: type: string format: date-time title: Updated Date description: >- Time the app document was last written, as a UTC timestamp in ISO 8601 format. example: '2026-08-02T14:30:00' created_by: anyOf: - type: string - type: 'null' title: Created By description: Email of the user who created the app. example: developer@example.com organization_id: anyOf: - type: string - type: 'null' title: Organization Id description: ID of the workspace the app belongs to. example: 67e0b12c4d8a3f005b21c9e4 app_type: type: string title: App Type description: >- 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. default: user_app example: user_app name: type: string title: Name description: Display name of the app. default: untitled example: My CRM user_description: anyOf: - type: string - type: 'null' title: User Description description: >- 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. example: A CRM to track leads and deals logo_url: anyOf: - type: string - type: 'null' title: Logo Url description: >- URL of the app's logo, or `null` if it has none. Set it with [Set app logo](/api-reference/set-app-logo) or [Generate app logo](/api-reference/generate-app-logo). example: >- https://storage.base44.com/6820f3a4e7b91d003c45a1f2/3f2504e0_logo.png social_image_url: anyOf: - type: string - type: 'null' title: Social Image Url description: >- 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](/api-reference/set-social-image). example: >- https://storage.base44.com/6820f3a4e7b91d003c45a1f2/7c9e6679_social.png public_settings: type: string enum: - private_with_login - public_with_login - public_without_login - workspace_with_login title: Public Settings description: >- Who can open the published app. Each value is described under [Update app](/api-reference/update-app), which also changes it. default: public_with_login example: public_with_login auth_config: $ref: '#/components/schemas/AuthConfiguration' description: >- Which login methods the app's login page offers. If the workspace enforces SSO for apps, the login page offers only SSO, whatever these are set to. Change them with [Update app](/api-reference/update-app). hide_entity_created_by: type: boolean title: Hide Entity Created By description: >- 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. default: false example: true is_remixable: type: boolean title: Is Remixable description: >- 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`. default: false example: false main_branch_protected: type: boolean title: Main Branch Protected description: >- 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](/api-reference/set-main-branch-protection). default: false example: false slug: anyOf: - type: string - type: 'null' title: Slug description: >- 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. example: my-crm-3c45a1f2 is_unpublished: type: boolean title: Is Unpublished description: >- Whether the app was taken offline with [Unpublish app](/api-reference/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. default: false example: false last_deployed_at: anyOf: - type: string format: date-time - type: 'null' title: Last Deployed At description: >- Time the app was last published, as a UTC timestamp in ISO 8601 format, or `null` if it has never been published. example: '2026-08-02T14:30:00' screenshot_url: anyOf: - type: string - type: 'null' title: Screenshot Url description: >- URL of a screenshot of the published app. Captured shortly after each publish, so it can briefly lag or be `null` right after publishing. example: https://storage.base44.com/screenshots/6820f3a4e7b91d003c45a1f2.png preview_screenshot_url: anyOf: - type: string - type: 'null' title: Preview Screenshot Url description: >- URL of a preview screenshot taken before publishing, distinct from `screenshot_url`, or `null` if none has been captured. example: https://storage.base44.com/previews/6820f3a4e7b91d003c45a1f2.png owner_id: anyOf: - type: string - type: 'null' title: Owner Id description: >- ID of the user who owns the app. It starts as the creator and changes when ownership is transferred. example: 6706af53b9c1e2004a37d85f status: $ref: '#/components/schemas/StatusObject' description: >- The app's current build status. Poll while a build is in progress to watch it finish. This tracks building, not publishing. dev_environment_enabled: type: boolean title: Dev Environment Enabled description: >- Whether test data is on, which gives the app a test database next to its live one. default: false example: false type: object title: UserApp StandardErrorEnvelope: properties: error: $ref: '#/components/schemas/StandardError' description: What went wrong. type: object required: - error title: StandardErrorEnvelope description: The error body returned in the standard envelope. AuthConfiguration: properties: enable_username_password: type: boolean title: Enable Username Password description: Whether people can sign in to the app with an email and password. default: false example: true enable_google_login: type: boolean title: Enable Google Login description: Whether people can sign in to the app with a Google account. default: true example: true enable_microsoft_login: type: boolean title: Enable Microsoft Login description: Whether people can sign in to the app with a Microsoft account. default: false example: false enable_facebook_login: type: boolean title: Enable Facebook Login description: Whether people can sign in to the app with a Facebook account. default: false example: false enable_apple_login: type: boolean title: Enable Apple Login description: Whether people can sign in to the app with an Apple account. default: false example: false type: object title: AuthConfiguration description: Authentication configuration for user applications StatusObject: properties: state: type: string enum: - ready - processing - error title: State description: >- Where the app is in its build lifecycle. Ready means idle with no build in progress, processing means the app is being generated or modified, and error means the last build failed. This tracks building, not publishing. example: ready details: anyOf: - type: string - type: 'null' title: Details description: >- Human readable note about the current state, such as what is being processed or why it failed, or `null` when there is nothing to report. example: Publishing app request_id: anyOf: - type: string - type: 'null' title: Request Id description: >- ID of the request that last changed the status, or `null` if the status has never changed. Useful when reporting an issue. example: a1b2c3d4e5f67890abcdef12 last_updated_date: anyOf: - type: string format: date-time - type: 'null' title: Last Updated Date description: >- Time the status was last updated, as a UTC timestamp in ISO 8601 format. example: '2026-08-02T14:30:00Z' error_source: anyOf: - type: string - type: 'null' title: Error Source description: >- Where the failure originated when `state` is `error`, or `null` otherwise. A value of `paywall` means the work was blocked because the app's workspace has no credits left. example: build paywall_context: anyOf: - $ref: '#/components/schemas/PaywallStatusContext' - type: 'null' description: >- Present when the operation was blocked by a plan limit, describing what was evaluated, or `null` otherwise. type: object required: - state title: StatusObject description: The app's current build status. StandardError: properties: code: type: string title: Code description: >- Stable machine-readable cause of the failure. Match on this, not on `message`. example: not_found message: type: string title: Message description: Human-readable explanation. It isn't a stable contract. example: App not found details: additionalProperties: true type: object title: Details description: >- Structured context for the failure, or an empty object when there's none. example: {} type: object required: - code - message title: StandardError PaywallStatusContext: properties: billing_organization_id: type: string title: Billing Organization Id description: ID of the billing organization the paywall was evaluated against. example: 67e0b12c4d8a3f005b21c9e4 user_id: type: string title: User Id description: ID of the user the paywall was evaluated for. example: 6706af53b9c1e2004a37d85f evaluated_at: type: string format: date-time title: Evaluated At description: >- Time the paywall condition was evaluated, as a UTC timestamp in ISO 8601 format. example: '2026-08-02T14:30:00Z' type: object required: - billing_organization_id - user_id - evaluated_at title: PaywallStatusContext securitySchemes: PersonalAccessTokenAuth: type: http scheme: bearer description: >- Personal access token, sent as `Authorization: Bearer `. Each operation lists the permission it needs: `read_only` or `full_access`. A full-access token can call every operation. A read-only token can call only the operations that list `read_only`; anything else returns 403 `read_only_credential_route_not_allowed`. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.