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 <script> tag.

<script src="https://YOUR_FASTN_HOST/api/v1/embed/assets/fastn-embed.min.js"></script>

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.