How to send emails with SvelteKit

In SvelteKit, use a `+server.ts` endpoint (or a form action) to send from the server. Read the key via `$env/static/private`.

Install the SDK (npm install publiq) and set PUBLIQ_API_KEY in your server environment. The code below runs on the server — the API key never reaches the client.

import { json } from '@sveltejs/kit';
import { Publiq } from 'publiq';
import { PUBLIQ_API_KEY } from '$env/static/private';

const publiq = new Publiq(PUBLIQ_API_KEY);

export async function POST({ request }) {
  const { to } = await request.json();
  const email = await publiq.emails.send({
    from: 'you@yourdomain.com',
    to,
    templateKey: 'welcome-email',
  });
  return json({ id: email.id });
}

Best practices

Always call Publiq from the server — never expose the API key on the client.
Create the client instance once and reuse it across requests.
Prefer templateKey over inline HTML to keep content versioned.
Handle PubliqError (status/code); the SDK already retries transient errors with backoff.
Send from a verified domain — see Domains.