# TanStack Start server (/docs/reference/tanstack-start-server)

```ts
import { … } from "@monarcode/session-kit/tanstack-start/server";
```

Guide: [TanStack Start](/docs/setups/tanstack-start).

## Functions [#functions]

### startJar [#startjar]

The `CookieJar` for the request TanStack Start is handling, to pass to `serverAuth` from `@monarcode/session-kit/server`. Use it in a server function, request middleware, a server route, or `beforeLoad` and loaders while they run on the server. Every call during one request returns the same jar.