> ## Documentation Index
> Fetch the complete documentation index at: https://docs.timeback.com/llms.txt
> Use this file to discover all available pages before exploring further.

# TanStack Start

> Integrate Timeback with TanStack Start

## Overview

The Timeback SDK provides a TanStack Start adapter using file-based route handlers.

## Installation

<CodeGroup>
  ```bash npm theme={null}
  npm install @timeback/sdk
  ```

  ```bash pnpm theme={null}
  pnpm add @timeback/sdk
  ```

  ```bash yarn theme={null}
  yarn add @timeback/sdk
  ```

  ```bash bun theme={null}
  bun add @timeback/sdk
  ```
</CodeGroup>

## Server Setup

Create a Timeback instance:

```typescript src/lib/timeback.ts theme={null}
import { createTimeback } from '@timeback/sdk'

export const timeback = await createTimeback({
	env: 'staging',
	api: {
		clientId: process.env.TIMEBACK_API_CLIENT_ID!,
		clientSecret: process.env.TIMEBACK_API_CLIENT_SECRET!,
	},
	identity: {
		mode: 'sso',
		clientId: process.env.AWS_COGNITO_CLIENT_ID!,
		clientSecret: process.env.AWS_COGNITO_CLIENT_SECRET!,
		redirectUri: 'http://localhost:3000/api/timeback/identity/callback',
		onCallbackSuccess: async ({ user, state, redirect }) => {
			await setSession({ id: user.id, email: user.email })
			return redirect(state?.returnTo ?? '/')
		},
		onCallbackError: ({ error, redirect }) => {
			return redirect('/?error=sso_failed')
		},
		getUser: () => getSession(),
	},
})
```

## Route Handler

Create a catch-all route handler:

```typescript src/routes/api/timeback/$.ts theme={null}
import { createFileRoute } from '@tanstack/react-router'
import { toTanStackStartHandler } from '@timeback/sdk/tanstack-start'

import { timeback } from '@/lib/timeback'

const handlers = toTanStackStartHandler(timeback)

export const Route = createFileRoute('/api/timeback/$')({
	server: { handlers },
})
```

## Client Provider

Wrap your app with the TimebackProvider:

```tsx src/routes/__root.tsx theme={null}
import { TimebackProvider } from '@timeback/sdk/react'

export const Route = createRootRoute({
	component: () => (
		<TimebackProvider>
			<Outlet />
		</TimebackProvider>
	),
})
```

## Usage

<Tip>
  For the full client-side API, see the [React client
  adapter](/beta/build-on-timeback/sdk/client/react).
</Tip>

Use hooks in components:

```tsx src/routes/index.tsx theme={null}
import { SignInButton, useTimeback } from '@timeback/sdk/react'

function HomePage() {
	const timeback = useTimeback()

	if (!timeback) {
		return <SignInButton>Sign In</SignInButton>
	}

	return <div>Welcome!</div>
}
```

## Next Steps

<CardGroup cols={2}>
  <Card title="React Client" href="/beta/build-on-timeback/sdk/client/react">
    Client-side React integration
  </Card>

  <Card title="Identity" href="/beta/build-on-timeback/sdk/identity">
    Authentication options
  </Card>

  <Card title="Custom Activities" href="/beta/build-on-timeback/sdk/activity-tracking/intro">
    Track learning sessions
  </Card>
</CardGroup>