ManaWG: a shared-flat app with Zod 4 at the API boundary

[Abuarchiv]

ManaWG is a free app for flatmates: shared expenses, a cleaning rota, a shopping list, a calendar and chat. Zod 4 is the validation layer at its API boundary.

Request bodies go through a small parseBody helper. It reads the JSON with a byte cap, runs the schema, and maps Zod issues to stable error codes, so route handlers answer 400 <code> instead of leaking validation messages. The checks that span fields live in superRefine, and the routes with several actions use discriminatedUnion.

Money is integer cents all the way down, and the settlement schema says so directly:

const centsSchema = z.number().finite().int().min(0).max(MAX_REVIEW_CENTS);

Repo: https://github.com/Abuarchiv/manawg (Apache-2.0)
Demo without an account: https://manawg.com/en/demo

I maintain it, and feedback on the Zod usage is welcome.