> For the complete documentation index, see [llms.txt](https://docs.fastn.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fastn.ai/embed/embedding/sdk.md).
# SDK
The SDK mounts the same iframe and adds events, token refresh, theming and modal mode.
Each variant expands to the exact snippet for the user you selected.
The SDK mounts the same iframe and adds what a raw tag cannot: events when a user connects an app, token refresh, live theming, and modal mode.
Four variants, depending on how much of the UI you want to own:
| Variant | Package path | Use when |
| --------------------- | -------------------------- | ------------------------------------------------------------------ |
| **React component** | `@fastn-ai/embed/react` | Your app is React and you want the whole panel. |
| **Connect card** | `@fastn-ai/embed/react` | You want the smallest surface: one card, one button. |
| **Script tag** | hosted bundle, no install | Vue, Svelte, Rails, plain HTML: anything that runs JS. |
| **Build your own UI** | `@fastn-ai/embed/headless` | The integrations screen has to look like the rest of your product. |
### React
The confirmed exports are `FastnConnectCard`, `FastnHub` and `FastnProvider`; the headless entry point exposes the hooks `useConnectors`, `useConnections` and `useConnect`.
`FastnProvider` supplies the session the other components read, so wrap your tree in it rather than mounting `FastnHub` bare. Copy the exact props from the dashboard's generated snippet. They are rendered there for the user you selected.
### Script tag
Not an npm install: a hosted bundle you load with a `
```
```javascript
const hub = FastnEmbed.createFastnEmbed({ /* config from the Embed tab */ });
hub.mount('#hub'); // inline
hub.open(); // or as a modal
hub.on('connected', (e) => {
// Refresh your app's data after the user connects an integration.
});
```
Because fastn hosts the screen, it gains features without you shipping a release, and its styles can never collide with yours.
---
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