---
description: Learn how use Svelte bindings for the Triplit client in your app.
---

import { Tabs, Tab, Callout } from 'nextra-theme-docs';
import CreateTriplitAppTabs from '../../components/CreateTriplitAppTabs.mdx';

# Svelte

<Callout emoji="👉">
  In anticipation of the release of Svelte 5, Triplit's Svelte bindings use
  [runes](https://svelte.dev/blog/runes). You must be using one of the
  pre-release versions of Svelte 5. You can force the compiler into "runes mode"
  [like this](https://svelte-5-preview.vercel.app/docs/runes#how-to-opt-in).
</Callout>

### New projects

The fast way to get started with Triplit is to use Create Triplit App which will scaffold a SvelteKit application with Triplit. Choose `Svelte` when prompted for the frontend framework.

<CreateTriplitAppTabs />

### Existing projects

If you have an existing Svelte or Svelte project, you can add the hooks provided by `@triplit/svelte`:

<Tabs items={['npm', 'pnpm', 'yarn', 'bun']}>

  <Tab>
    ```bash copy
    npm i @triplit/svelte
    ```
  </Tab>
    <Tab>
    ```bash copy
    pnpm add @triplit/svelte
    ```
  </Tab>
  <Tab>
    ```bash copy
    yarn add @triplit/svelte
    ```
  </Tab>
    <Tab>
    ```bash copy
    bun add @triplit/svelte
    ```
  </Tab>
</Tabs>

## SvelteKit

If you are using SvelteKit, you can use the hooks described below, but you will need to ensure that the client only attempts to connect to the sync server over WebSockets when in the browser. You can do this by checking if the `browser` variable from `$app/environment` is `true`.

```ts filename="src/lib/client.ts"
import { TriplitClient } from '@triplit/client';
import { browser } from '$app/environment';
import { PUBLIC_TRIPLIT_URL, PUBLIC_TRIPLIT_TOKEN } from '$env/static/public';

export const client = new TriplitClient({
  serverUrl: PUBLIC_TRIPLIT_URL,
  token: PUBLIC_TRIPLIT_TOKEN,
  autoConnect: browser,
});
```

The suggested pattern is to create a client instance in a module and import it into your components.

### `vite.config.ts`

With the default SvelteKit configuration Vite will not be able to bundle files outside of the `src` or `node_modules` directory. To allow Vite to bundle the files in the `triplit` directory created with `triplit init`, you can add the following configuration to your `vite.config.ts` file:

```ts filename="vite.config.ts" {6} copy
import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';

export default defineConfig({
  plugins: [sveltekit()],
  server: { fs: { allow: ['./triplit'] } },
});
```

## useQuery

The `useQuery` hook subscribes to the provided query inside your Svelte component and will automatically unsubscribe from the query when the component unmounts.

The result of the hook is an object with the following properties:

- `results`: An array of entities that satisfy the query.
- `fetching`: A boolean that will be `true` initially, and then turn `false` when either the local fetch returns cached results or if there were no cached results and the remote fetch has completed.
- `fetchingLocal`: A boolean indicating whether the query is currently fetching from the local cache.
- `fetchingRemote`: A boolean indicating whether the query is currently fetching from the server.
- `error`: An error object if the query failed to fetch.
- `updateQuery`: A function that can be called to update the query.

```svelte filename="App.svelte"
<script lang="ts">
  import { useQuery } from '@triplit/svelte'
  import { TriplitClient } from '@triplit/client'
  import { schema } from '../triplit/schema';

  const client = new TriplitClient({ schema });

  let data = useQuery(client, client.query('todos'));
</script>
<div>
  {#if data.fetching}
    <p>Loading...</p>
  {:else if data.error}
    <p>Error: {data.error.message}</p>
  {:else if data.results}
    <div>
      {#each data.results as todo}
        <div>{todo.text}</div>
      {/each}
    </div>
  {/if}
</div>
```

## useConnectionStatus

The `useConnectionStatus` hook subscribes to changes to the connection status of the client and will automatically unsubscribe when the component unmounts.

```svelte copy filename="App.svelte"
<script lang='ts'>
  import { useConnectionStatus } from '@triplit/svelte';
  import { TriplitClient } from '@triplit/client'

  const client = new TriplitClient({
    schema,
    serverUrl: import.meta.env.VITE_TRIPLIT_SERVER_URL,
    token: import.meta.env.VITE_TRIPLIT_TOKEN,
  });

  const connection = useConnectionStatus(client);
</script>
<div>
{#if connection.status === 'OPEN'}
  <p>The client is connected</p>
{:else}
  <p>The client is not connected</p>
{/if}
</div>
```
