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Add a waitlist in a SvelteKit app

Collect signups before launch and turn them into users afterwards. Each signup gets a referral code, invites go out in first-come order, and the whole list exports as CSV.

Keys

Browser calls use a publishable key (nv_pub_live_…), which is safe to ship. Reading and admin calls use a secret key (nv_live_…) on your server only. Create both under Dashboard → API keys.

PUBLIC_NORDVA_PUBLISHABLE_KEY=nv_pub_live_…  # .env
NORDVA_SECRET_KEY=nv_live_…  # .env, $env/static/private

01Browser: signup form (publishable key)

src/lib/WaitlistForm.svelte

<script lang="ts">
  import { PUBLIC_NORDVA_PUBLISHABLE_KEY as KEY } from "$env/static/public";
  let email = "";
  let result: null | { position: number; already: boolean; link: string } = null;
  let err: string | null = null;

  async function submit() {
    err = null;
    const res = await fetch("https://api.nordva.dev/v1/waitlist/signups", {
      method: "POST",
      headers: {
        Authorization: `Bearer ${KEY}`,
        "Content-Type": "application/json",
      },
      body: JSON.stringify({ email, referrer_code: new URLSearchParams(location.search).get("ref") ?? undefined }),
    });
    const { data, error } = await res.json();
    if (error) { err = error.message; return; }
    result = { position: data.position, already: data.already_registered, link: data.referral_link };
  }
</script>

{#if result}
  <p>{result.already ? "Already on the list" : "You're in"} — #{result.position}. Share: <a href={result.link}>{result.link}</a></p>
{:else}
  <form on:submit|preventDefault={submit}>
    <input type="email" required bind:value={email} placeholder="[email protected]" />
    <button type="submit">Join waitlist</button>
    {#if err}<p role="alert">{err}</p>{/if}
  </form>
{/if}

The publishable key is safe to ship to browsers. Register your site's origin under Project → Allowed origins first, or the request is refused with ORIGIN_NOT_ALLOWED.

02Server: read stats, endpoint

src/routes/api/waitlist-stats/+server.ts

import { NORDVA_SECRET_KEY } from "$env/static/private";
import { json } from "@sveltejs/kit";

export async function GET() {
  const res = await fetch("https://api.nordva.dev/v1/waitlist/stats", {
    method: "GET",
    headers: {
      Authorization: `Bearer ${NORDVA_SECRET_KEY}`,
    },
  });
  if (!res.ok) {
    const { error } = await res.json();
    throw new Error(`${error.code}: ${error.message}`);
  }
  const { data } = await res.json();
  // data.total_signups, data.confirmed_count, data.invited_count, data.top_referrers
  return json(data);
}

03Zero-code alternative: hosted widget

any HTML page

<script src="https://cdn.nordva.dev/v1/waitlist.js"
  data-key="nv_pub_live_…"
  data-placeholder="[email protected]"
  data-button="Join waitlist"
  data-success="You're on the list"
  data-theme="auto"></script>
<nordva-waitlist></nordva-waitlist>

04Verify from a terminal

curl -s https://api.nordva.dev/v1/waitlist/stats \
  -H "Authorization: Bearer nv_live_…" | jq .data

Behaviour worth knowing

  • Every response is { data, error, meta }. On failure error.code is a stable string such as VALIDATION_ERROR, PLAN_LIMIT_REACHED or RATE_LIMITED, with a remediation message.
  • POST and PATCH requests accept an Idempotency-Key header; the same key with the same body returns the original response for 24 hours.
  • Rate limits per key: 30 requests a minute on Free, 120 on Indie, 500 on Builder. A 429 carries Retry-After.
  • Browser calls with a publishable key must come from an origin registered on the project, otherwise the API answers ORIGIN_NOT_ALLOWED.