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Base44 Platform Backend Functions
Base44 server-side code: backend functions (HTTP handlers in base44/functions/<name>/entry.ts on Cloudflare Workers) for Vite SPA apps, or TanStack Start server functions and server routes. Secrets, the Base44 SDK on the server, auth and service role, webhooks, admin-only handlers, frontend invocation, testing, and the InvokeLLM model table. Use when the app needs external APIs, privileged logic or scheduled work.
npx skills add base44/skills --skill base44-platform-backend-functionsInstalls from the source repository, including any supporting files.
Instructions
Downloads contain the instructions shown here. Use the install command for the complete skill.
<!-- GENERATED FILE. DO NOT EDIT. Compiled from the Base44 builder's prompt sources; the
source commit is in /SOURCE_COMMIT at the repository root. Edits here are overwritten by
the next sync; change the source instead. -->
Base44 backend functions
A Vite SPA app runs server code as backend functions; a TanStack Start app runs it as server functions and server routes inside its own project. Writing the file deploys it.
Requires the Builder plan or above. The workspace's entitlement is reported by the agent-profile endpoint; on a lower plan the platform rejects the operation.
Pick the reference for this app
Determine the app profile first. Call GET /api/apps/{app_id}/agent-profile (over the Base44 MCP execute_api
tool, or with your Base44 CLI token); it returns the framework, app type, runtime,
entitlements and the exact reference files to read. Without it, detect from the project files:
src/routes/__root.* and src/routeTree.gen.ts mean TanStack Start; app/_layout.* means a
native mobile (Expo) app; otherwise it is a Vite SPA.
| Profile | Read |
|---|---|
| Web app, Vite SPA (the default web template) | Backend functions (Vite SPA) |
| Web app, TanStack Start | Server functions and server routes (TanStack Start) |
| Native mobile app (Expo, React Native) | Backend functions (mobile apps) |
View raw Markdown
---
name: base44-platform-backend-functions
description: "Base44 server-side code: backend functions (HTTP handlers in base44/functions/<name>/entry.ts on Cloudflare Workers) for Vite SPA apps, or TanStack Start server functions and server routes. Secrets, the Base44 SDK on the server, auth and service role, webhooks, admin-only handlers, frontend invocation, testing, and the InvokeLLM model table. Use when the app needs external APIs, privileged logic or scheduled work."
---
<!-- GENERATED FILE. DO NOT EDIT. Compiled from the Base44 builder's prompt sources; the
source commit is in /SOURCE_COMMIT at the repository root. Edits here are overwritten by
the next sync; change the source instead. -->
# Base44 backend functions
A Vite SPA app runs server code as backend functions; a TanStack Start app runs it as server functions and server routes inside its own project. Writing the file deploys it.
> **Requires the Builder plan or above.** The workspace's entitlement is reported by the agent-profile endpoint; on a lower plan the platform rejects the operation.
## Pick the reference for this app
Determine the app profile first. Call `GET /api/apps/{app_id}/agent-profile` (over the Base44 MCP `execute_api`
tool, or with your Base44 CLI token); it returns the framework, app type, runtime,
entitlements and the exact reference files to read. Without it, detect from the project files:
`src/routes/__root.*` and `src/routeTree.gen.ts` mean TanStack Start; `app/_layout.*` means a
native mobile (Expo) app; otherwise it is a Vite SPA.
| Profile | Read |
|---|---|
| Web app, Vite SPA (the default web template) | [Backend functions (Vite SPA)](references/web-spa.md) |
| Web app, TanStack Start | [Server functions and server routes (TanStack Start)](references/web-tanstack.md) |
| Native mobile app (Expo, React Native) | [Backend functions (mobile apps)](references/mobile.md) |