AI Builder Guides

Lovable

Add email sending with SendDart to a Lovable project, storing your API key securely via Supabase.

Lovable is a platform for building sites, tools, apps, and projects via chat. You can add SendDart to a Lovable project by asking the chat to add email sending with SendDart.

1. Add your SendDart API key

Create a SendDart API key in the dashboard. Lovable may wire up email in a few ways:

Store the API key as a secret via the Supabase integration *(highly recommended)*.
Prompt you to provide your own API key.
Add the API key directly in the code (least secure — avoid).

Prompt Lovable to store the key for SendDart using Supabase. The send itself runs in a Supabase Edge Function; in Deno/Edge environments it can POST to https://www.senddart.com/api/emails directly, or use the senddart Node SDK (npm install senddart) when the function targets a Node-compatible runtime.

At the time of writing, Lovable relies on the Supabase integration to store secrets rather than handling API keys independently. Keep the key out of client-side code.

2. Add a custom domain

By default you can only send email to your own address. To send to other recipients, add and verify a custom domain, then update the from address used by the edge function.

Once your custom domain is verified, the edge function does not redeploy automatically. Ask Lovable to update the from address to your verified domain and redeploy the function so the change takes effect.